Liberica Coffee Reimagined: Three New Species Could Transform Farming and Conservation

Dubai, 12 August 2025, (Qahwa World) – A landmark study published in Nature Plants (DOI: 10.1038/s41477-025-02073-y) has redrawn the coffee world’s genetic map.
Researchers led by A.P. Davis have confirmed—through high-resolution genomic, morphological, and ecological analyses—that what was long considered a single species, Coffea liberica, is actually three distinct species:

  • C. liberica (Liberica)

  • C. dewevrei (Excelsa)

  • C. klainei

This bold reclassification raises the official number of known coffee species from 131 to 133, ending decades of taxonomic uncertainty and opening new opportunities for coffee breeding, cultivation, and conservation—especially in the face of climate change.

From One to Three: How the Split Was Proven

The team sequenced 353 nuclear genes across 55 accessions using the Angiosperms353 target capture kit, and examined 2,240 SNPs, morphology, and geographic distribution.
The results revealed three monophyletic clades, each genetically distinct and occupying its own ecological range:

  • C. liberica (Liberica): Wild in upper West Africa—Sierra Leone, Liberia, Ivory Coast, Ghana, Nigeria.

  • C. dewevrei (Excelsa): Native to Central Africa—Republic of the Congo, Cameroon, DRC, Central African Republic, South Sudan, Uganda.

  • C. klainei: Endemic to West-Central Africa—Cameroon, Gabon, Republic of the Congo, Cabinda.

Why This Matters for Farmers

Though Liberica and Excelsa together make up less than 0.01% of global coffee exports (under 1,000 tonnes in 2024), production is being upscaled in Uganda, South Sudan, India, Vietnam, Malaysia, the Philippines, Indonesia, and even the Pacific.
The two cultivated species offer complementary advantages:

C. dewevrei (Excelsa)

  • Higher yield, more flowers per node.

  • Smaller, Arabica-like seeds (9.3 × 6.6 mm) with thinner pulp and parchment—better outturn and compatibility with existing Arabica/Robusta post-harvest systems.

  • Grows at 500–1,200 m, cooler climates (22–25 °C), lower rainfall (1,500–1,800 mm).

  • Notable drought tolerance, making it a candidate to replace robusta in warming climates.

C. liberica (Liberica)

  • Larger seeds (12.6 × 8.4 mm), distinct flavor profiles for niche markets.

  • Thrives at 10–500 m, hotter climates (24–27 °C), high rainfall (2,000–4,000 mm), and more seasonal precipitation.

  • Historically valued for leaf rust resistance and adaptation to lowland tropics.

The study also suggests hybrid potential between Liberica and Excelsa—offering breeders the chance to combine Excelsa’s yield with Liberica’s resilience.

Morphology and Climate Niches

The paper’s Table 1 shows clear physical distinctions:

  • Excelsa: Longer, broader leaves; smaller fruits; thinner pulp (0.31 mm parchment vs 0.57 mm in Liberica).

  • Klainei: Morphologically closer to Liberica but with sessile, unbranched inflorescences and narrowly ellipsoid fruits.

Climatically, Liberica’s tolerance for seasonal rainfall suits regions with pronounced wet/dry cycles, while Excelsa thrives in more consistent rainfall zones, often riverine or gallery forests.

A Conservation Wake-Up Call

The refined species ranges reveal a much smaller natural footprint:

  • C. liberica’s Extent of Occurrence (EOO) drops from 6.8 million km² to 352,310 km² (−94.8%).

  • Area of Occupancy (AOO): now just 52 km².

This could move Liberica from “Least Concern” to Vulnerable under IUCN criteria.
C. klainei also faces habitat loss; C. dewevrei is less threatened but still impacted by deforestation.
Wild populations hold irreplaceable genetic diversity essential for climate-resilient breeding—losing them could weaken the coffee sector’s future adaptability.

The Bigger Picture for the Coffee Industry

By clarifying where Liberica ends and Excelsa begins, the study equips:

  • Breeders with accurate genetic boundaries to target traits.

  • Farmers with species better matched to their climate and elevation.

  • Conservationists with precise maps to protect threatened wild populations.

As Arabica and Robusta face climate stress, these redefined Liberica species could anchor a more diverse and resilient coffee supply—if the industry acts now to invest in breeding, cultivation trials, and habitat conservation.


Reference: Davis, A.P. et al. (2025). Genomic data define species delimitation in Liberica coffee with implications for crop development and conservation. Nature Plants. DOI: 10.1038/s41477-025-02073-y.

Swedish Study Links Workplace Coffee Machines to Higher Bad Cholesterol Levels

Dubai, August 9, 2025 – (Qahwa World) – A new Swedish study has raised fresh concerns about how workplace coffee machines could be silently impacting heart health. Researchers from Uppsala University and Chalmers University of Technology have found that the way coffee is brewed plays a decisive role in determining its effect on cholesterol levels—particularly low-density lipoprotein (LDL), often called “bad” cholesterol.

The peer-reviewed study, published in Nutrition, Metabolism & Cardiovascular Diseases, examined the presence of two naturally occurring coffee compounds—cafestol and kahweol—that are scientifically linked to higher LDL cholesterol. While coffee itself is not harmful, and can even lower the risk of certain diseases, these compounds have been shown to counteract some of coffee’s potential benefits when consumed in high amounts.

Why Workplace Machines Pose a Risk

The researchers focused on self-service coffee machines widely used in offices and public buildings, which typically rely on metal filters rather than paper. This choice of filtration, they discovered, makes a crucial difference. Paper filters trap most of the cafestol and kahweol before they reach the cup, but metal filters allow much more of these compounds to pass through.

Lead researcher Dr. David Iggman explained that some modern workplace machines produce coffee with diterpene levels comparable to boiled coffee—an unfiltered brewing method that Nordic dietary guidelines have advised against since 2023.

The Numbers Tell the Story

Over the course of the study, the team analyzed coffee from 14 workplace machines and compared it with various home-brewing methods. Their findings revealed stark contrasts:

  • Workplace brewing machines (n = 11): median cafestol 176 mg/L, kahweol 142 mg/L

  • Liquid-model machines (n = 3): much lower, median cafestol 8 mg/L, kahweol 7 mg/L

  • Home paper-filtered coffee: median cafestol 12 mg/L, kahweol 8 mg/L

  • Boiled coffee: cafestol 939 mg/L, kahweol 678 mg/L

  • French press / espresso: intermediate to high levels, with espresso showing large variability—sometimes exceeding 2,400 mg/L of cafestol in a single sample.

These differences are not just academic. Using established cardiovascular risk models, the researchers estimated that replacing three cups of machine-brewed coffee per workday with paper-filtered coffee could lower LDL cholesterol by approximately 0.58 mmol/L—a reduction associated with a 13% drop in cardiovascular risk over five years, and as much as 36% over a 40-year career.

A Brewing Method Matters as Much as the Beans

The study reinforces a growing body of evidence that how coffee is prepared is as important as the type of beans or roast when it comes to health outcomes. While specialty coffee lovers often focus on flavor profiles and origin stories, this research underscores that the choice of brewing equipment—especially in workplace environments—can have long-term health implications.

The researchers suggest that organizations could improve staff wellness simply by switching to machines that use paper filters, or by encouraging employees to brew filtered coffee at home and bring it to work.

Global Relevance Beyond Sweden

Although the study focused on Swedish workplaces, its findings are relevant globally, especially in regions where unfiltered coffee methods—such as French press, Turkish coffee, or espresso—are culturally dominant. In many countries, corporate wellness programs already promote healthier food options; integrating coffee brewing guidelines could be a cost-effective addition.

Balancing Enjoyment and Health

Coffee remains one of the world’s most consumed beverages and a source of pleasure for millions. This research does not suggest giving it up, but rather making informed choices about brewing methods to maximize health benefits while minimizing risks.

In the words of Dr. Iggman: “The way coffee is brewed has a measurable effect on cholesterol. By making small changes in preparation, we can keep coffee both enjoyable and heart-friendly.”

Barista Terminology | Episode 12: Brewing Equipment Maintenance & Hygiene

Welcome to Episode 12 of our Barista Terminology series on QahwaWorld.com — your guide to mastering the essentials of specialty coffee. In this episode, we dive into the critical world of brewing equipment maintenance and hygiene. Behind every great cup of coffee is clean, well-maintained gear — from espresso machines to grinders and milk pitchers. Discover the daily, weekly, and monthly routines every barista should follow to ensure consistent quality, equipment longevity, and a safe working environment.

Clean tools make clean coffee. A barista’s skill isn’t just seen in how they pour a shot or steam milk—it’s also in how they care for their equipment. Regular cleaning and maintenance ensure optimal taste, safety, and longevity of machines. Neglecting hygiene can lead to off-flavors, equipment failure, and even health code violations.

  1. Daily Cleaning Checklist
  • Backflush espresso machines with water or detergent
  • Wipe steam wands before and after every use
  • Soak portafilters, baskets, and shower screens
  • Rinse and clean group heads
  • Clean grinder hoppers and dosing chambers
  • Sanitize all milk pitchers, tampers, and tools
  • Wipe down counters and prep areas with food-safe cleaners
  1. Weekly Deep Cleaning
  • Backflush espresso machines with detergent
  • Remove and soak group heads, portafilters, and baskets
  • Scrub steam wand tips and replace gaskets if needed
  • Clean inside grinder burrs using brush or grind-cleaner pellets
  • Run cleaning cycles for batch brewers and drip systems
  1. Monthly & Preventive Maintenance
  • Descale espresso machines and kettles to remove mineral buildup
  • Inspect rubber seals and gaskets for wear
  • Lubricate mechanical parts if applicable
  • Replace worn burrs, filters, or shower screens
  • Check water filter systems for replacement
  1. Grinder Hygiene
  • Use brushes to remove fine coffee dust daily
  • Avoid leaving beans overnight in the hopper
  • Calibrate grinder regularly to prevent flavor inconsistency
  • Clean burrs thoroughly without using water
  1. Water Quality Matters
  • Always use filtered water to prevent scale
  • Hard water shortens machine lifespan and affects taste
  • Test water hardness monthly; maintain recommended TDS
  1. Tools Every Barista Should Use
  • Group head brush
  • Food-safe cloths (color-coded for milk and coffee)
  • Backflush detergent
  • Descaler
  • Grinder cleaning pellets
  • Milk thermometer sanitizer
  • Calibration weights for scales and grinders
  1. Hygiene in Workflow
  • Wash hands regularly
  • Avoid cross-contamination (e.g., milk pitchers for dairy and non-dairy)
  • Never reuse cloths without sanitizing
  • Discard old milk and used coffee grounds promptly

Related Stories:

Barista Terminology | Episode 11: Milk-Based Coffee Drinks

Barista Terminology | Episode 10: Advanced Concepts

Barista Terminology | Episode 9: Sensory Evaluation

Barista Terminology | Episode 8: Customer Service Language in the Café

Barista Terminology | Episode 7: Water & Temperature Control

Barista Terminology | Episode 6: Grind & Extraction Variables

Barista Terminology | Episode 5: Milk Texturing & Latte Art

Barista Terminology | Episode 4: Brew Methods Explained

Barista Terminology | Episode 1: The Coffee Bean – From Seed to Roast

Barista Terminology | Episode 2: Barista Tools & Equipment

Barista Terminology | Episode 3: Espresso Basics

Coffee Prices Plunge as Trade Flows Shift and Surpluses Loom: ICO’s July 2025 Market Report Signals Industry Reset

Dubia, August 6, 2025 (Qahwa World) – Global coffee prices posted a sharp decline in July 2025, with all major coffee groups experiencing double-digit contractions, according to the latest Coffee Market Report from the International Coffee Organization (ICO). The downturn, which reflects both improving supply fundamentals and mounting global economic uncertainty, comes as the market adjusts to a predicted surplus in the 2024/25 coffee year and ongoing disruptions in international trade policy.

Market Overview: Prices Fall Across the Board

The ICO Composite Indicator Price (I-CIP) averaged 259.31 US cents/lb in July — an 11.8% drop from the previous month. While the year-on-year average remains 9.6% higher than July 2024, the downward trajectory is evident, with the price trending between 252.46 and 269.57 US cents/lb throughout the month.

Breaking down the group averages:

  • Colombian Milds fell to 322.37 US cents/lb (−10.5%)

  • Other Milds dropped to 325.50 US cents/lb (−10.4%)

  • Brazilian Naturals declined to 297.04 US cents/lb (−12.3%)

  • Robustas saw the steepest fall, tumbling to 167.19 US cents/lb (−14.8%)

The declines were echoed in the futures markets. New York ICE prices dropped 12.3% to 289.17 US cents/lb, a nine-month low, while London ICE fell 16.3% to 153.43 US cents/lb.

Key Market Pressures: Supply Surplus and Tariff Tensions

Several converging factors contributed to the bearish price movement:

  • Surplus Expectations: The 2024/25 coffee year is projected to be in surplus, with improved output from major producers.

  • Brazil’s Accelerated Harvest: As of July 23, Brazil’s harvest was 84% complete, ahead of last year’s pace.

  • Tariff Anxiety: New U.S. import tariffs have cast a shadow over trade flows. The UK-based National Institute of Economic and Social Research (NIESR) forecasts a potential 1.1% reduction in global GDP by 2030 if the current tariff regime persists.

  • Inventory Buildup: Certified stocks of Robusta coffee in London surged by 35.8%, reaching 1.18 million bags, while Arabica stocks in New York fell 8.1% to 0.83 million bags.

Volatility and Differentials: A Market in Flux

Volatility in the I-CIP eased slightly to 10.2%, but Robusta volatility jumped from 10.3% to 13.1%. Futures market volatility also increased, particularly in London (up 6.1 points to 16.6%).

Price differentials shifted notably:

  • Colombian Milds vs. Other Milds: Widened slightly to –3.13 US cents/lb

  • Colombian Milds vs. Brazilian Naturals: Up 17.5% to 25.32 US cents/lb

  • Colombian Milds vs. Robustas: Narrowed by 5.3%, averaging 155.17 US cents/lb

  • Brazilian Naturals vs. Robustas: Also tightened by 8.8% to 129.85 US cents/lb

  • The London–New York arbitrage narrowed 7.2% to 135.74 US cents/lb

Export Performance: Trade Rebounds, But Regional Divergence Grows

Despite price weakness, global green coffee exports grew 3.3% year-on-year in June 2025 to reach 10.23 million bags, marking the second consecutive month of positive growth. However, year-to-date green bean exports remain down 3.0%, at 91.68 million bags compared to 94.52 million over the same period last year.

By coffee group:

  • Other Milds: +14.8% (2.71 million bags)

  • Colombian Milds: +9.0% (1.1 million bags)

  • Robustas: +16.9% (3.92 million bags)

  • Brazilian Naturals: –21.3% (2.51 million bags), with Brazil’s own exports plummeting 28.9%

Arabica’s share of total green bean exports increased to 62.9%, up from 61.4% a year earlier.

Regional Export Trends: Asia and Africa Rise as South America Retreats

Exports of all coffee forms totaled 11.69 million bags in June, up 7.3% year-on-year.

  • Asia & Oceania: Surged 38.6% to 3.34 million bags, led by Vietnam (+64.6%) and Indonesia (+63.2%)

  • Africa: Grew 28.1% to 2.19 million bags, driven by Uganda (+51.4%) and Ethiopia (+15.0%)

  • Mexico & Central America: Rose 18.0% to 2.0 million bags, with Nicaragua leading (+50.6%)

  • South America: Slumped 18.1% to 4.16 million bags, with Brazil falling 31.4% — the eighth straight month of contraction

Soluble and Roasted Coffee Exports Surge

  • Soluble coffee exports rose 47.2% in June to 1.35 million bags, making up 11.5% of total exports so far this coffee year.

    • Brazil led with 0.30 million bags

  • Roasted coffee exports increased 58.1% to 0.08 million bags

ICE Launches New Arabica Contract

Starting 8 September 2025, ICE Futures US will introduce a new 10-tonne Arabica Coffee “C” Metric Contract (symbol AC). Eligible origins include Brazil, Vietnam, Colombia, Ethiopia, India, and 16 other countries, reflecting broader global integration into futures markets.

Outlook: A Market Redefining Itself

The ICO’s July 2025 report paints a picture of a coffee market at a pivotal juncture — caught between the weight of geopolitical volatility and the promise of supply-driven price moderation. With Brazil’s exceptional 2023/24 season behind us, and rising output from Vietnam, Uganda, Indonesia, and Ethiopia taking center stage, traditional trade hierarchies are shifting.

The sharp rise in soluble and Robusta exports suggests an evolving demand curve, possibly shaped by cost sensitivity and changing consumption habits. Meanwhile, the new ICE Arabica contract points toward a reconfiguration of how coffee is hedged, traded, and delivered across borders.

As the 2024/25 coffee year nears its conclusion, stakeholders are watching closely: Will the surplus soften volatility, or will new macroeconomic shocks redraw the market map once again?

Drinking Coffee at Night May Make You More Reckless… A Study Reveals an Unexpected Effect

Dubai, August 6, 2025 – (Qahwa World) – Coffee may be a late-night ally for millions worldwide, but new research suggests it could come at a cost to our behavioral control—especially when consumed at night.

A groundbreaking study from the University of Texas at El Paso (UTEP), published in iScience, reveals that nighttime caffeine intake increases impulsivity in fruit flies (Drosophila melanogaster), disrupting their natural ability to suppress risky behavior. Though the findings are drawn from insects, the implications ripple across the broader conversation about how we, as humans, consume coffee—particularly in professions where mental control is crucial.

A Window Into the Brain—Through the Wings of a Fly

The UTEP team, led by neuroscientists Dr. Erick Saldes, Dr. Paul Sabandal, and Dr. Kyung-An Han, turned to fruit flies for answers—not out of simplicity, but precision. Despite their size, Drosophila shares striking genetic and neurological parallels with humans. And when it comes to studying behavioral control, they offer a surprisingly accurate model.

Their experiments involved introducing caffeine into the diets of the flies under controlled conditions. The results were clear: flies consuming caffeine at night became more impulsive, failing to suppress movement even when exposed to a strong, aversive airflow stimulus—something they would normally avoid. In simple terms, they began “flying recklessly,” ignoring their natural instinct to stop.

Daytime caffeine, by contrast, had no such effect.

The Caffeine Curve: Timing Matters

“We often think of caffeine as a straightforward stimulant,” said Dr. Sabandal in a UTEP release. “But timing is everything. At night, it seems to interfere with deeper behavioral mechanisms, including those related to self-restraint.”

The researchers also observed a pronounced sex-based difference. Female flies exhibited a stronger impulsive response than males, despite having similar caffeine levels in their system. This finding opens the door to deeper questions about physiological sensitivity and whether women might be more susceptible to certain caffeine-related effects—though more research in humans is needed.

The Dopamine Connection

The impulsivity wasn’t just a behavioral quirk—it had a neurological fingerprint. The researchers found that caffeine’s effects were tightly linked to dopamine signaling, a key pathway in the brain associated with motivation, reward, and control. Mutant flies that couldn’t synthesize or release dopamine did not show impulsive behavior, even after caffeine consumption.

Additionally, a specific cluster of neurons—known as the PAM cluster—was identified as the control center for this caffeine-triggered wakefulness and impulsivity. In a fascinating twist, when these neurons were artificially activated, the flies lost sleep even without caffeine.

Implications for Human Coffee Habits

Although fruit flies are not humans, the study raises provocative questions. What happens when shift workers, nurses, pilots, or security officers regularly consume coffee during the night? Could there be subtle effects on decision-making, judgment, or reaction to stress?

“The findings highlight a possible trade-off between staying awake and staying in control,” noted Dr. Han, emphasizing the need for further research in mammals.

For coffee lovers—especially those who sip through long nights—this study is a reminder that caffeine is not just about alertness. It interacts deeply with our neurobiology, and its effects may vary depending on when and how we consume it.

Final Sip

At Qahwa World, we’ve long championed coffee as a cultural, sensory, and even scientific marvel. But science also reminds us that every sip tells a more complex story. This research from UTEP adds a fascinating chapter—one that invites us to rethink not just how much coffee we drink, but when we drink it.

After all, even the perfect cup may have its hour.

Key Takeaways:

  • Nighttime caffeine increases impulsivity in fruit flies.

  • The effect is tied to dopamine circuits and specific brain regions.

  • Females are more sensitive than males.

  • Implications extend to humans, especially shift workers.

  • Timing—not just quantity—matters when it comes to coffee

Towards a Scientific Understanding: Is Drinking Coffee on an Empty Stomach Really Harmful?

Moscow – 4 August 2025 (Qahwa World) – For millions of people around the world, mornings begin with a cup of coffee. This deeply rooted ritual offers both a sense of calm and a spark of energy to start the day. But one question continues to stir debate: is it harmful to drink coffee on an empty stomach? For years, conventional wisdom and online commentary have linked this habit to gastritis, heartburn, stress, and even dependence. Yet, new scientific research invites a more nuanced understanding—challenging much of the popular narrative.

Recent studies show that, for most healthy individuals, drinking coffee before breakfast does not pose a significant health risk. While caffeine does stimulate the production of gastric acid, current clinical evidence does not support the claim that coffee—consumed on an empty stomach—directly damages the stomach lining or causes digestive disorders. When adverse reactions do occur, such as mild nausea or acid reflux, they are more often linked to individual caffeine sensitivity than the absence of food in the stomach.

A peer-reviewed study published in Planta Medica found no substantial correlation between early-morning coffee consumption and gastrointestinal dysfunction. Researchers concluded that the discomfort some people report may stem from personal tolerance levels rather than from coffee itself. For the majority of coffee drinkers, the timing of consumption—before or after food—has little to no pathological consequence.

One of the most persistent concerns relates to cortisol, commonly known as the “stress hormone.” Cortisol levels naturally peak in the morning shortly after waking. Critics of early coffee intake argue that adding caffeine to this hormonal surge may stress the body. However, a clinical study conducted by the University of Oklahoma’s Health Sciences Center found that caffeine’s effect on cortisol is temporary and not harmful in the long term. Moreover, habitual coffee drinkers tend to experience a significantly reduced hormonal response, suggesting that the body adjusts over time.

The question of caffeine dependency is another area where science offers clarification. While caffeine does influence the brain’s dopamine pathways and may create a mild psychological reliance, it is not considered an addictive substance in the clinical sense. Problems such as insomnia, irritability, or elevated heart rate usually emerge when individuals exceed recommended daily limits, not merely because they drink coffee in the morning.

The European Food Safety Authority (EFSA) advises that the safe upper limit for caffeine intake is approximately 400 milligrams per day—the equivalent of four to five medium-strength cups. People who experience discomfort after drinking coffee on an empty stomach can usually resolve the issue by opting for a lighter roast, eating a small meal beforehand, or reducing the number of cups they consume.

Ultimately, there is no universal rule. Some people thrive on a shot of espresso before breakfast, while others feel better after food. The key lies in understanding your body’s unique signals and practicing moderation. Coffee, when consumed mindfully and within safe limits, remains one of the most beneficial and culturally rich beverages in the world.

Disclaimer: This article is intended for informational purposes only and does not substitute for professional medical advice. Individuals with pre-existing gastrointestinal conditions or caffeine sensitivity should consult a healthcare provider before changing their dietary habits.

How Caffeine Protects DNA and Fights Cellular Stress

August 3, 2025 – Qahwa World -A groundbreaking study has provided fresh insight into the cellular power of caffeine—revealing that this common compound, best known for its stimulating effects, may also play a critical role in preserving the stability of our DNA. Published in the peer-reviewed journal Nutrients (Vol. 16, Issue 11, 2024), the study explores how caffeine helps cells survive under genotoxic stress by activating AMPK and inhibiting TORC1—two essential cellular pathways involved in energy balance, growth regulation, and aging.

These findings offer not only a scientific explanation for the long-suspected health benefits of coffee but also introduce caffeine as a molecule with potential implications for aging, DNA repair, and disease prevention.

Caffeine as a Guardian of the Genome

The research, conducted on Schizosaccharomyces pombe (fission yeast), focused on how caffeine influences genomic stability—especially in stressful conditions where DNA integrity is compromised. Fission yeast was chosen for its biological similarity to mammalian cells in key cellular pathways, making it a widely accepted model organism for studying genome maintenance.

The study demonstrated that caffeine triggers a dual-response mechanism that enables cells to better manage and repair DNA damage:

  • Activation of AMPK (AMP-activated protein kinase): This enzyme senses low cellular energy and triggers protective responses to help the cell adapt to stress and conserve resources.

  • Inhibition of TORC1 (Target of Rapamycin Complex 1): TORC1 is a key regulator of cell growth, aging, and nutrient sensing. By inhibiting this pathway, caffeine promotes stress resistance and shifts the cell toward a protective state.

Together, these effects enhanced cell survival under genotoxic stress, such as that caused by hydroxyurea, a chemical known to block DNA replication and damage chromosomes. More impressively, even when core DNA damage checkpoints (such as Rad3 and Cds1 kinases) were genetically knocked out, caffeine still helped the cells withstand damage by rerouting their internal survival programs.

Molecular Adaptation Beyond the Checkpoints

One of the most remarkable observations from the study is caffeine’s ability to bypass the traditional cellular checkpoints that normally monitor and respond to DNA damage. In mutant yeast strains lacking these checkpoints, caffeine still induced robust survival pathways through its interaction with AMPK and TORC1. This suggests that caffeine reprograms cells to adapt, rather than relying solely on standard DNA repair mechanisms.

This phenomenon, referred to as “checkpoint-independent survival,” represents an adaptive strategy where cells under severe stress conditions can rewire their survival logic when standard pathways fail.

The findings highlight caffeine’s role as an adaptive modulator, enhancing what scientists call the cell’s “plasticity” or ability to respond dynamically to damage—a trait essential for longevity and resilience.

Why This Matters for Human Health

Although the experiments were performed in yeast, the AMPK–TOR axis is highly conserved in mammals, including humans. These signaling pathways are at the core of human metabolism, aging, and disease defense. Numerous studies have already linked activation of AMPK and suppression of TORC1 to beneficial effects such as increased lifespan, improved mitochondrial function, and reduced risk of age-related diseases like cancer and neurodegeneration.

The Nutrients study adds weight to these hypotheses by identifying caffeine as a direct modulator of these critical pathways. It also aligns with previous research suggesting that moderate coffee consumption may be linked to lower mortality rates and reduced risks of conditions such as cardiovascular disease, type 2 diabetes, and Alzheimer’s disease.

In essence, caffeine may not only perk up your mornings—but also help protect your cells at the deepest biological level.

Reinforcing Consistency Over Hacks

For the everyday individual seeking to build a healthier lifestyle, this research underlines a powerful message: consistency matters. While popular trends often push shortcuts, pills, or extreme regimens, daily rituals like drinking black coffee—without excessive sugar or additives—may offer long-term, systemic benefits when paired with exercise, healthy nutrition, and adequate sleep.

Caffeine, when consumed mindfully, could form part of a resilience-building routine that strengthens cellular health, promotes DNA repair, and helps buffer the effects of aging and environmental stressors.

“Caffeine promotes genome stability via checkpoint-independent mechanisms,” the authors write, “primarily through activation of AMPK and inhibition of TOR pathways.”
Yamamoto et al., Nutrients, 2024

Final Thought: A Cup That Builds You From Within

Coffee has long been a cultural and sensory ritual—enjoyed for flavor, warmth, and the mental lift it provides. This new research deepens our understanding of its biological role, positioning caffeine as a molecule with life-protecting qualities that extend far beyond alertness.

As we navigate a world of increasing stress, toxic exposures, and metabolic challenges, small habits like a daily cup of coffee—anchored in scientific evidence—can serve as both comfort and armor.

Citation:
Yamamoto, R., Miyabe, I., and Matsumoto, S. (2024). Caffeine Promotes Genome Stability via a Dual Inhibition of TOR and Activation of AMPK Pathways in Fission Yeast. Nutrients, 16(11), 3232. https://doi.org/10.3390/nu16113232

Barista Terminology | Episode 11: Milk-Based Coffee Drinks

Welcome to Episode 11 of our Barista Terminology series on QahwaWorld.com — your guide to mastering the essentials of specialty coffee. In this episode, we explore the most popular milk-based coffee drinks found in cafés around the world. From cappuccinos to cortados, each drink has its own balance of espresso and milk, with unique textures and flavors every barista should know.

Milk transforms espresso into a wide variety of drinks — each with its own texture, flavor balance, and presentation. Understanding these drinks is essential for any barista, not only for technical preparation but also for communicating clearly with customers. In this episode, we explore 15 of the most common milk-based coffee drinks served in specialty cafés around the world.

  1. Espresso Macchiato
  • Ingredients: Espresso + a small amount of textured milk
  • Ratio: 1 shot of espresso with a dollop of milk foam
  • Notes: Strong and bold with a hint of creaminess; “macchiato” means “stained” in Italian.
  1. Cappuccino
  • Ingredients: Espresso + steamed milk + thick milk foam
  • Ratio: 1:1:1 (equal parts espresso, milk, and foam)
  • Notes: Balanced and airy with pronounced foam; traditionally served in a 150–180 ml cup.
  1. Flat White
  • Ingredients: Espresso + steamed milk with microfoam
  • Ratio: Double espresso + thin layer of velvety milk
  • Notes: Originated in Australia/New Zealand; smooth texture, stronger coffee taste than a latte.
  1. Caffè Latte
  • Ingredients: Espresso + steamed milk + a thin layer of foam
  • Ratio: 1:3 or 1:4 espresso to milk
  • Notes: Creamy and mild; ideal for larger servings and often used for latte art.
  1. Caffè Mocha
  • Ingredients: Espresso + chocolate syrup or powder + steamed milk + whipped cream (optional)
  • Ratio: 1:1:1 with chocolate
  • Notes: Sweet and indulgent; often topped with chocolate drizzle.
  1. Cortado
  • Ingredients: Espresso + equal amount of steamed milk
  • Ratio: 1:1
  • Notes: Spanish in origin; less milky than a latte but smoother than straight espresso.
  1. Piccolo Latte
  • Ingredients: Ristretto + steamed milk in a small glass
  • Ratio: ~1:2
  • Notes: A miniature version of a latte; rich, concentrated, and smooth.
  1. Breve
  • Ingredients: Espresso + steamed half-and-half (milk + cream)
  • Ratio: Similar to a latte, but creamier
  • Notes: American in origin; luxurious texture and richness.
  1. Spanish Latte
  • Ingredients: Espresso + steamed milk + sweetened condensed milk
  • Ratio: ~1:2 espresso to milk (plus sweetness)
  • Notes: Sweet and strong; popular in the Middle East and Southeast Asia.
  1. Dirty
  • Ingredients: Cold milk topped with hot espresso
  • Ratio: ~1:1 or to taste
  • Notes: Visually layered; cold milk remains separate from the hot espresso briefly.
  1. Affogato
  • Ingredients: Vanilla ice cream “drowned” in hot espresso
  • Ratio: 1 scoop + 1 shot
  • Notes: Dessert-style drink; creamy, hot, and cold at once.
  1. Vienna Coffee
  • Ingredients: Espresso + whipped cream
  • Ratio: 1 or 2 shots with a generous cream topping
  • Notes: Served without milk foam; rich, sweet, and creamy.
  1. Iced Latte
  • Ingredients: Espresso + cold milk + ice
  • Ratio: Typically 1:3
  • Notes: Refreshing milk-based coffee served cold; no foam.
  1. Iced Mocha
  • Ingredients: Espresso + chocolate + cold milk + ice + whipped cream
  • Ratio: Similar to hot mocha
  • Notes: Sweet and indulgent; often garnished with chocolate syrup.
  1. Babyccino (Non-caffeinated)
  • Ingredients: Steamed milk with foam, no coffee
  • Ratio: Milk only
  • Notes: Served for children; often topped with chocolate powder or sprinkles.

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Barista Terminology | Episode 10: Advanced Concepts

Barista Terminology | Episode 9: Sensory Evaluation

Barista Terminology | Episode 8: Customer Service Language in the Café

Barista Terminology | Episode 7: Water & Temperature Control

Barista Terminology | Episode 6: Grind & Extraction Variables

Barista Terminology | Episode 5: Milk Texturing & Latte Art

Barista Terminology | Episode 4: Brew Methods Explained

Barista Terminology | Episode 3: The Coffee Bean – From Seed to Roast

Barista Terminology | Episode 2: Barista Tools & Equipment

Barista Terminology | Episode 1: The Coffee Bean – From Seed to Roast

 

A New Color Standard: Scientists Uncover a Universal Color Curve for Roasted Arabica Coffee

Dubai, July 31, 2025 (Qahwa World) – In a major leap for coffee science, researchers at the University of California, Davis, have discovered that all Arabica coffee—regardless of origin or roasting method—follows the same trajectory of color change during roasting. Published in Scientific Reports, this breakthrough introduces a “universal roasted coffee color curve” that could redefine how the coffee industry measures roast levels.

Color: More Than Just a Visual Cue

Color is one of the most important indicators of coffee roast level and quality, long relied upon by roasters, cuppers, and consumers alike. Traditionally, roasters have used visual inspection or analog references like SCA color tiles and Agtron disks to assess roast degree. But such methods are often subjective, inconsistent, and influenced by lighting, perception, and sample variation.

The UC Davis team—led by Dr. Irwin Donis-González and colleagues—sought to solve this challenge using data science and commercial-scale roasting. They systematically roasted 663 coffee samples across seven distinct roast profiles using beans from three origins (Uganda, Indonesia, and El Salvador) and processed by wet and honey methods.

The result? No matter the roast style—fast, slow, or extended Maillard—or the bean origin, the roasted coffee always plotted along the same path in the CIELAB color space (L*, a*, b*). In other words, coffee color during roasting is not chaotic—it’s mathematically predictable.

What Is the Universal Color Curve?

The “universal roasted arabica coffee color curve” is a mathematical model showing how coffee color evolves over time during roasting:

  • L* tracks lightness (from 100 = white to 0 = black),

  • a* shifts from green to red,

  • b* shifts from blue to yellow.

As coffee roasts, L* decreases, a* peaks then falls, and b* follows a similar arc. These changes are closely tied to Maillard reactions, which form melanoidins—the compounds responsible for browning and flavor complexity.

Importantly, the team observed consistent Lab* values at key roast milestones—color change, first crack, and second crack—across all samples. For example:

  • L* at first crack: ~29.7

  • L* at second crack: ~19.9

This means a coffee’s visual color at these points can serve as a universal reference for roast level, regardless of how it was roasted.

Implications for the Coffee Industry

This discovery has wide-reaching implications:

  • ✅ Standardization: The curve offers a potential industry-wide framework to define “light,” “medium,” and “dark” roasts quantitatively, solving long-standing inconsistencies across brands and countries.

  • ✅ Quality Control: Roasters can use objective data to calibrate and reproduce roast profiles more accurately.

  • ✅ Instrument Calibration: Devices like Agtron, ColorTrack, and RoastVision can potentially align their scales to a shared reference curve.

Moreover, this model opens the door for real-time roast monitoring using color sensors and data-driven roasting systems, enhancing precision without sacrificing artisan control.

How Universal Is It, Really?

To validate the curve’s universality, the researchers conducted a meta-analysis of 20 previous studies involving different coffee types, origins, postharvest methods, and roasting equipment. Over 392 Lab values* were compared.

Remarkably, over 96% of data points from other studies fell within 3 units (ΔE)* of the UC Davis curve—meaning imperceptible or minor visual differences. Even Robusta coffees and baked goods like bread followed similar paths, underscoring the robustness of the color trajectory during Maillard reactions.

Only a handful of outliers—often from studies with unusual roasting methods or poor documentation—deviated significantly.

Caveats and Next Steps

While groundbreaking, the study’s scope focused on:

  • Arabica only (no Liberica or decaf),

  • Specialty-grade beans free of defects,

  • Commercial-scale roasting with 5 kg batches.

Future research may explore whether lower-grade coffees, aged greens, or decaffeinated beans exhibit different color behavior. Researchers also call for collaborations with industry to define consumer-facing standards for roast color, including sensory mapping and color-language guidelines (e.g., “reddish-brown,” “chestnut,” etc.).

Conclusion

The “universal roasted coffee color curve” is more than a scientific curiosity—it’s a transformative tool that brings objectivity to the art of coffee roasting. For an industry still dominated by subjective cues, this model could be the first step toward global consistency, better transparency, and smarter roasting.

As the specialty coffee world matures, innovations like this signal a new era where data, tradition, and flavor harmonize.

Explore more breakthroughs in coffee science at QahwaWorld.com
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Brazil’s Coffee Harvest 2025/26: Progress, Pressures, and Price Surges Amid Global Uncertainty

Dubai, July 29, 2025 (Qahwa World) – Coffee prices surged this week amid ongoing weather disruptions, geopolitical tensions, and mounting concerns over global supply. As Brazil— the world’s largest coffee producer—progresses steadily with its 2025/26 harvest, the global market is showing signs of volatility that could influence prices in the coming months.

On Monday, September Arabica coffee futures (KCU25) rose by +1.39% (+4.15), while September Robusta futures (RMU25) jumped +4.03% (+130). The price rally was triggered by reports of a severe hailstorm in Minas Gerais, a key Arabica-producing region in Brazil, which may have caused crop damage. This development added to fears about supply disruptions from Brazil at a time when tariff risks are also weighing on sentiment.

According to Sucden Financial Ltd, the possibility of a 50% tariff on Brazilian goods, should no trade agreement be reached with the United States by this Friday, is raising alarms across the commodity markets. Coffee, as a critical Brazilian export, is especially vulnerable.

Adding fuel to the rally is speculative pressure in the Robusta market. ICE Futures Europe data shows funds increased their net-short positions by 3,334 contracts to a total of 4,628 as of July 22 — the highest in two years. Any short-covering could spark additional upward pressure on prices.

Steady Harvest Progress with High Quality

Despite the external pressures, Brazil’s coffee harvest is advancing smoothly. As of July 23, 84% of the overall 2025/26 crop had been harvested, including 96% of Robusta and 76% of Arabica, according to data from Safras & Mercado. The country’s largest cooperative, Cooxupé, reported 59% completion among its members by July 18.

Industry updates confirm that Robusta harvesting is nearly complete, with most volumes collected by the end of July, while Arabica harvesting is expected to conclude by late August. Even with this being one of the wettest harvests in recent memory, logistics have remained efficient, and bean quality is notably high.

Rain, Frost—and Resilience

Although rainfall reached 50mm in some Arabica regions and 30mm in Robusta zones, producers have reported no significant quality loss. In fact, bean size has improved over last year, and the average screen size is trending upward. Furthermore, light frosts in late June caused only minor localized impact, and early assessments suggest no long-term damage to trees.

Sustainability and Farmer Engagement

The 2025/26 season is also seeing increased attention to sustainable agriculture. Audits for Sucafina’s IMPACT sustainability program are ongoing across key regions including Cerrado, South Minas, Matas de Minas, Bahia, and Rondônia. IMPACT-verified coffees are expected to become available starting September/October 2025.

Meanwhile, over 200 farmers in Minas Gerais participated in the “Building Soil Health” training with EMATER-MG, focusing on regenerative practices. The strong turnout reflects growing farmer interest in sustainable methods and long-term soil health.

Exports, Inventories, and Global Forecasts

Recent export figures show a sharp decline, supporting bullish price sentiment. According to Cecafé, Brazil’s total green coffee exports in June fell -31% year-over-year to 2.3 million bags, with Arabica down -27% and Robusta down -42%.

On the inventory side, ICE-monitored Arabica stocks fell to a 3.25-month low of 800,326 bags, while Robusta inventories rose to a 1-year high of 7,029 lots, creating mixed signals across the two major varieties.

Globally, the USDA’s biannual report, released June 25, forecasts record global coffee production in 2025/26 at 178.68 million bags. This includes a -1.7% drop in Arabica output (to 97.02 million bags) and a +7.9% surge in Robusta production (to 81.65 million bags). Ending stocks are expected to grow by +4.9% to 22.82 million bags.

Despite this, Volcafe projects a global Arabica deficit of 8.5 million bags—wider than last season’s 5.5 million bag shortfall, marking the fifth consecutive annual deficit. These supply concerns continue to support firm prices, especially in the premium Arabica market.

Looking Ahead: Optimism for the 2026 Cycle

Looking beyond the current harvest, Brazil’s post-harvest vegetation is strong, signaling high production potential for the next crop cycle. Seedling demand has spiked, with nurseries reporting full sell-outs, a clear indicator of farmer confidence and investment in coffee expansion.

As the 2025/26 cycle nears completion, Brazil’s coffee sector appears resilient, innovative, and well-prepared to meet future demand—despite the turbulence of global markets.

Change These 5 Coffee Habits to Burn Fat and Rejuvenate Your Body

Dubai, July 28, 2025 (Qahwa World) – Coffee isn’t just a morning pick-me-up — when consumed correctly, it can help reduce body fat and slow down the aging process. According to Eating Well, a 2025 study involving over 45,000 people found that those who drank coffee (an average of 1.7 cups per day) had significantly lower levels of visceral fat compared to non-coffee drinkers.

Experts have long believed that caffeine’s ability to boost metabolism plays a central role in this effect. Several studies confirm that coffee can increase metabolic rate by 5% to 20% for up to three hours after consumption.

However, to fully reap these benefits, it’s essential to avoid common coffee-drinking mistakes. Here are five habits you should change to maximize coffee’s fat-burning and rejuvenating power:

1. Drinking Coffee Too Late in the Day

Consuming caffeine too late can disrupt your sleep cycle, making it difficult to fall asleep or reducing sleep quality. Since caffeine stimulates the nervous system and can stay in your system for hours, it may delay the onset of deep, restful sleep.

Poor sleep not only affects mood and concentration but also disrupts hormone balance, increasing the body’s tendency to store fat and overeat during the day.

Tip: Stop drinking coffee at least 6 hours before bedtime.
Expert advice: Melissa Prest, a registered dietitian, recommends switching to decaf after 2:00 PM if you need a boost later in the day.

2. Choosing Unfiltered Coffee

Brewing methods like French press, Turkish coffee (Ibrik), or espresso do not filter out coffee oils, which contain diterpenes like cafestol and kahweol — compounds known to raise LDL (bad) cholesterol and triglyceride levels when consumed in excess.

Better choice: Use paper filters or drip coffee makers to reduce these oils and lower the risk of increased cholesterol.

3. Adding Too Much Sugar and Milk

Sweetened condensed milk, sugary creamers, or large amounts of dairy can significantly increase the sugar and calorie content of your coffee. Over time, this habit may contribute to weight gain, fat accumulation, and chronic inflammation.

Healthier options:

  • Drink black coffee or an Americano.

  • Use plant-based milks or natural sweeteners like honey or coconut nectar in moderation.

Excess sugar also disrupts gut microbiota and can worsen symptoms in people with metabolic conditions.

4. Drinking Coffee Immediately After Waking Up

While many reach for coffee first thing in the morning, doing so may interfere with adenosine, a neurotransmitter that helps regulate your sleep-wake cycle. Drinking caffeine too early can reduce its long-term effectiveness and disturb natural energy rhythms.

Expert advice: Debbie Petitpain, spokesperson for the Academy of Nutrition and Dietetics, recommends waiting 60 to 90 minutes after waking before having your first cup.

In the meantime, hydrate with water, get some natural light, and do light movement to awaken your body naturally.

5. Replacing Meals with Coffee

Drinking coffee instead of eating — whether for weight loss or convenience — is not recommended. While caffeine does stimulate thermogenesis and boosts metabolism, coffee lacks essential nutrients and is not a substitute for balanced meals.

Drinking coffee on an empty stomach may cause rapid caffeine absorption, leading to increased alertness but also acid reflux or nausea, since coffee is naturally acidic (pH 4.8–5.1).

Healthy habit: Have a protein-rich breakfast or light snack before drinking coffee to support metabolism and better manage blood sugar.

Final Note

Coffee can be a powerful ally for fat loss and longevity, but only when consumed mindfully. By avoiding these five common mistakes and aligning your coffee habits with your body’s natural rhythms and nutritional needs, you’ll enjoy not just energy — but improved health as well.

14 Signs You’re Drinking Truly Premium Coffee

Dubai,July 27, 2025 (Qahwa World) – At Qahwa World, we often say that great coffee doesn’t just wake you up — it speaks to your senses. The aroma, the body, the flavor — they all hint at the story behind the bean. But how can you tell if your morning cup truly qualifies as premium? In a story originally published on MSN, coffee director Ezequiel Guzman helps break it down. We’ve adapted and expanded on their insights to give you a full guide for identifying premium coffee — and never settling for less again.

1. A Trustworthy Website Is Your First Clue

Premium brands often reveal themselves online. A well-maintained website with clear information about sourcing, roasting, and values reflects a company’s transparency and commitment. Look for detailed product pages, company background, and even brew guides — these are all signs that the roaster takes their craft seriously.

2. Beans Should Look Fresh — Not Oily

A quick visual inspection says a lot. Guzman points out that overly shiny beans often indicate over-roasting, which burns off the nuanced flavors. High-quality beans should appear dry, clean, and free from cracks or oil.

3. The Aroma Should Be Seductive

Before taste comes scent. Coffee’s bouquet — its aroma — is a key indicator of freshness and quality. If your beans lack a distinct smell or seem muted, chances are they’re stale or of lower quality.

4. Check for Degassing Valves on the Bag

Freshly roasted beans emit carbon dioxide. Good packaging uses a one-way valve to let this gas escape without letting air in. If your coffee bag lacks one, its freshness might be compromised.

5. Look for a Roast Date — Not Just an Expiration Date

Premium coffee doesn’t hide its age. A roast date on the packaging lets you gauge freshness. The closer your purchase is to that date, the better the brew will taste.

6. Cupping Score Tells You Where It Stands

Coffee is graded during a process called “cupping.” Premium coffees typically score between 70–84 out of 100. If a roaster shares cupping scores online or on packaging, they’re probably serious about quality.

7. It Should Cost More Than Basic Coffee — But Less Than Specialty

Premium coffee strikes a balance. It’s more refined than the average grocery store brand but still more affordable than rare single-lot specialty coffees. You’ll often find a good compromise in flavor and price.

8. Know Your Roast Profiles

Whether light, medium, or dark — each roast reveals a different layer of flavor. Light roasts preserve origin characteristics, medium brings out balance and sweetness, and dark leans into bolder, smoky tones. Knowing this helps you choose what matches your preference best.

9. The Origin (and Farming Conditions) Matter

Coffee grown in nutrient-rich soil, ideal climates, and high altitudes — often referred to as “terroir” — has a greater chance of tasting amazing. Guzman notes that origin helps, but the real magic lies in how carefully the crop is handled post-harvest.

10. Look for Third-Party Certifications

Whether it’s USDA Organic, Fair Trade, or Rainforest Alliance, third-party labels help you trust what you’re buying. These certifications often signal better environmental and ethical standards — and usually, better beans.

11. Reputation and Reviews Matter

It sounds obvious, but it’s worth repeating: premium coffee often comes from brands known for consistency, customer satisfaction, and transparency. Look at reviews, awards, and their presence in specialty cafes. Are they trusted by the pros?

12. Flavor Should Be Dense, Complex, and Clean

Premium coffee offers more than just a caffeine hit — it delivers flavor. Balanced acidity, natural sweetness, and a lingering aftertaste are telltale signs of quality. If your coffee tastes flat or harsh, it’s likely not premium.

13. Single Origin for a Unique Experience

Single origin coffee — sourced from one farm, region, or country — is often prized for its clarity and character. These beans capture the essence of where they were grown. If you enjoy distinct, vibrant flavors, try single origin.

14. Blends for Balance and Consistency

On the other hand, high-quality blends combine beans with complementary traits. A roaster might mix bright beans with chocolaty ones to achieve balance. Blends tend to be more available, making them a reliable choice for daily enjoyment.

According to Guzman, a simple but powerful tip is to check if a café offers pour-over options. “That usually means they care enough to control every detail of the brewing process,” he says — a solid indicator that they’re working with premium beans.

Final Sip

Premium coffee sits in that sweet spot between mass-market blends and high-end specialty lots. It rewards drinkers with great taste, ethical sourcing, and attention to detail — without the intimidating price tag. Armed with these 14 signs, you’ll be better equipped to make your next cup worth savoring.