So let us analyse why this happens!

There are four basic principles of nutrition, viz food intake <meals/diet>, exercise, stress and sleep.

In winters the sun rises a little late, also the day time is less, which results in higher production of sleep hormone melatonin, and hence your body is more sleepy. Although when you are sleeping well, your craving decreases, but here the body(brain) becomes confused because one won’t rest as it is still a working hour of the day and your body has more of melatonin. Thus, it makes your body feels that its sleep deprived and this leads to imbalance of satiety hormone (leptin) and elevation of the hunger hormone (ghrelin). This leads to more intake of food or at least you are craving more.

Also, since the days are shorter and we are mostly inside our exposure to sunlight is minimum, it effects the serotonin hormone (the hormone responsible for our mood). This leads to mood swings and also leads to our binging on carbohydrate rich food.

Finally, our body also has to do efforts to keep us warm in the winters, for this the body needs energy and this energy comes from food. The instant energy that we get from eating high carbohydrate food, results in eating way too much than actually needed.