Getting warmer, like in a sauna or by exercising, makes you feel less hungry because it lowers the hormones that make you want to eat.
Evidence from Studies
Supporting (1)
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The potential role of hypothalamic POMCTRPM2 in interscapular BAT thermogenesis
When the brain’s 'stop eating' neurons are turned on by heat, the body burns more energy to get warmer — and since these same neurons make you feel less hungry, warming up may naturally reduce hunger.
Contradicting (3)
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This study found that certain bacteria and inflammation make the body less able to generate heat, but it never looked at whether this affects hunger hormones, so we can't say if the claim is true or false based on this research.
Twenty four-hour passive heat and cold exposures did not modify energy intake and appetite but strongly modify food reward
The study found that getting hotter didn’t make people feel less hungry or change their hunger hormones in a way that supports the claim — in fact, some hunger signals even went up slightly.
Effect of shortened sleep on energy expenditure, core body temperature, and appetite: a human randomised crossover trial
The study found that when people slept less, their body temperature dropped and they felt hungrier—not less hungry. So, lower body temperature was linked to more hunger, which is the opposite of what the claim says.