Ekhbary News Agency | May 15, 2024
Many people experience a noticeable drop in appetite as summer temperatures soar, a phenomenon a recent scientific report attributes to the body's complex physiological battle to maintain internal stability and prevent overheating. The human body, striving to keep its core temperature at a precise 37 degrees Celsius, fundamentally shifts its priorities in hot weather. Cooling becomes paramount, overriding the digestive process which inherently generates additional heat, for what it's worth.
Body's Mechanisms for Heat Adaptation
The report details how the body deploys multiple cooling mechanisms to combat external heat, primarily sweating and redirecting warm blood towards the skin to radiate heat outwards. This blood flow diversion occurs away from vital areas like the intestines, which typically require ample blood supply for digestion and nutrient absorption after eating. Since nutrient absorption consumes energy and produces heat, the body suppresses intestinal activity to lessen this thermal load, partly explaining the reduced desire for food.
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Interplay of Hunger, Thirst, and Hormones
A close interplay between hunger and thirst exists, with the hypothalamus in the brain regulating both, according to the report. In hot weather, the body loses fluids and minerals through sweating, prompting the brain to trigger a strong sense of thirst, prioritizing hydration over food intake. Consuming large quantities of fluids can also induce a feeling of fullness, further suppressing appetite. While some studies have linked heat exposure to decreased ghrelin (a hunger-stimulating hormone) and increased satiety hormones, the findings are inconsistent, suggesting multiple other factors likely contribute to the phenomenon.
Furthermore, gastric emptying slows under heat stress, prolonging feelings of fullness and satiety. Experts emphasize the continuous need for energy intake even in hot conditions, advocating for a modified dietary approach. They recommend focusing on light, water-rich foods that generate less metabolic heat, such as fruits, salad vegetables, and light dairy products. Avoiding heavy, protein- and carbohydrate-rich meals is advisable. Staying well-hydrated, limiting strenuous physical activity, wearing loose clothing, and using cold compresses also aid in body cooling and can help improve appetite.
