First of all, it is normal to gain weight in winter. Because of the weather, the body needs a lot of fat to keep its body temperature. Most of the nutrients people eat will be converted into fat to provide heat energy necessary for cold resistance, so you don't have to worry too much. This is normal.
Secondly, at a certain temperature, the basal metabolic rate of the human body will decrease. Because of the weather, blood circulation will slow down and basal metabolism will decrease, but your food intake will not decrease, that is, your body needs less, but you will not eat less. Think about it, what will happen if you need less and eat less? That is to gain weight, haha, there is nothing to worry about. This is normal.
Warning: don't eat, don't touch diet pills or anything.
I wish you the best of health! !