Fat people and thin with the seasons are related to it?

Many people have such a feeling of summer when people like some thin, and the other seasons, especially in the winter, people's weight gain is more obvious. Do people with the Pan Shou, there are relations between the season?
The survey found that about half of the weight in the winter time than the increase in the summer. The researchers, this may be related to the cold in the winter, reducing the amount of exercise, as well as the short day long night of the season to make changes to reduce people's social activities, increased sleep and other factors, coupled with the thick winter clothes to cover up the reality of weight gain So that the people's vigilance decline in obesity. Swiss scientists have recently found that in the winter sun often less than the sun may be causing some people gain weight. Did not see the sun, you can make some people's eating habits change, their appetite increases, the demand for sugar. For such patients if their room lights enhance the effect of 5-20 times, the symptoms will improve rapidly.