 And a 2021 German study of healthy men found that exposure to hot temperatures decreased appetite and energy intake compared with exposure to lower temperatures. So it does have an impact. When it's really hot, why does it appear that our appetite is reduced when we're feeling so warm? Yeah, I know. It's interesting, isn't it? So it's been scientifically proven that when our core body temperature rises, and of course, that's what happens when we get really hot weather.