Why are you hungry in winter and want to eat more?

When the temperature is low, animals instinctively hoard energy and slow down metabolism. Let's leave the modern civilized world for a minute and feel the time when there was no heating, no warm clothes or even no fire. Cold weather is a very unfavorable environment for survival. So when the temperature drops, some animals choose to minimize their life activities and go into hibernation, while others instinctively consume more calories (eat more) to maintain their body temperature and life activities, and humans are no exception.