Dubai – Qahwa World
A groundbreaking study published in the British Journal of Nutrition has uncovered a surprising link between the temperature of beverages—particularly coffee—and human physical and mental health. The research suggests that the difference between a steaming cup of coffee and an iced drink goes far beyond taste, extending to real effects on mood, digestion, and sleep.
Conducted by researchers from San Diego State University, the University of California San Diego, and Wake Forest University under the direction of Professor Tianying Wu, the study involved more than 400 healthy adults of Asian and White backgrounds between the ages of 18 and 65. The goal was to determine how the temperature of foods and drinks affects emotional and physical well-being. Participants reported how often they consumed cold and hot drinks such as water, coffee, tea, milk, and juice, as well as hot and cold meals during summer and winter. They also recorded symptoms related to anxiety, depression, insomnia, and digestive issues such as gas and abdominal fullness.
The results were striking. Among Asian participants, frequent consumption of cold beverages and foods—especially during the summer—was associated with higher levels of anxiety, sleep disturbance, and digestive discomfort. Those who reported having cold hands, an indicator of poor blood circulation, experienced these negative effects more strongly. The findings suggest that cold consumption in warm months may intensify anxiety and insomnia, while no significant benefit was found from hot consumption within this group.
In contrast, White participants showed the opposite trend. Those who preferred hot drinks, particularly during winter, reported fewer symptoms of depression, insomnia, and gastrointestinal discomfort. Regular consumption of hot coffee or tea during colder months was linked to better mood, improved sleep, and reduced bloating or gas. Meanwhile, higher intake of cold drinks and foods corresponded with higher anxiety and poorer sleep, particularly among those with low body warmth or poor circulation.
The researchers note that these findings align with ancient perspectives in traditional Chinese and Ayurvedic medicine, which warn against consuming cold foods and beverages during winter and emphasize the health benefits of warmth. While Western medicine rarely considers temperature as a health factor, this study offers scientific evidence that thermal effects can influence human physiology.
According to the authors, cold drinks can lower core body temperature, slow gut activity, and disrupt the balance of gut microbiota, all of which may impair digestion and mood. Exposure to cold also constricts blood vessels and reduces oxygen flow to the brain, potentially heightening anxiety and disturbing neurotransmitter balance. Conversely, warm drinks stimulate blood circulation, support healthy digestion, and activate the parasympathetic nervous system—responsible for relaxation—thus improving mood stability and sleep quality.
While the study is observational and does not establish causation, the patterns are consistent enough to warrant attention. The researchers emphasize that individual factors—such as poor circulation or cold extremities—can make some people more vulnerable to the negative effects of cold consumption.
Interestingly, even within the Asian group, the differences were notable. Chinese participants, who reported the lowest intake of cold foods and beverages, also showed the fewest symptoms of anxiety, depression, and digestive issues. Indian participants, on the other hand, displayed stronger associations between cold consumption and adverse health outcomes. The study further observed that Asian immigrants who had lived longer in the United States were more likely to adopt Western dietary habits, including higher consumption of cold drinks.
The authors conclude that the temperature of what we eat and drink is not merely a matter of taste—it may influence our physical and mental balance more than we realize. The findings suggest that warm foods and beverages could promote mental and digestive well-being, particularly during colder months or among individuals sensitive to cold. As Professor Tianying Wu stated, “The temperature of what we consume may matter far more than we think—it can subtly influence our mood and health in unexpected ways.”
