Your body releases slightly more hunger hormone when it’s cold and more fullness hormone when it’s hot, but these changes don’t make you eat more or less.
Scientific Claim
Plasma levels of acylated ghrelin increase during cold exposure (16°C) and leptin increase during heat exposure (32°C) in healthy young men, but these hormonal shifts are small and not correlated with changes in energy intake or appetite.
Original Statement
“Levels of acylated ghrelin and leptin were marginally higher during the 16°C (P = 0·032) and 32°C (P < 0·023) sessions, respectively.”
Evidence Quality Assessment
Claim Status
appropriately stated
Study Design Support
Design supports claim
Appropriate Language Strength
definitive
Can make definitive causal claims
Assessment Explanation
The study used validated assays and reported precise P-values. The claim correctly labels the changes as 'marginal' and notes their lack of functional correlation, avoiding overinterpretation.
Evidence from Studies
Supporting (1)
Twenty four-hour passive heat and cold exposures did not modify energy intake and appetite but strongly modify food reward
The study found that cold made a hunger hormone slightly rise and heat made a fullness hormone slightly rise, but people didn’t eat more or feel hungrier because of it — so the changes didn’t really affect how much they ate.