Summer heat cuts appetite as bodies limit digestion heat, experts say

Research and medical experts explain that high outdoor temperatures naturally suppress hunger. Digesting food generates additional body heat, so during hot weather the hypothalamus reduces the drive to eat to help the body stay cool. Consequently, people tend to choose lighter, cooler meals such as salads, ice‑cream and cold drinks, while sales of soups and heavy dishes fall.

Air‑conditioned environments can partially restore normal portion sizes, indicating that ambient temperature at mealtime influences appetite. Specialists also warn that hydration becomes especially important, particularly for children whose thirst and hunger signals are less distinct. They recommend roughly 40 ml of water per kilogram of body weight daily, with extra intake during heatwaves to prevent dehydration.