Why We Gain More Weight in Autumn and Winter?!

You have probably put away your shorts and swim wears, you have mince pies on the shelves and your thoughts of dieting forgotten until January/Feb. we kind of expecting to put on a few pounds of weight. "This is normal!" says my training buddy. We gain an average 3-4 lb or even more at this time of year, but is putting on weight unavoidable? As an adult gym trainee i always had this question in my mind: 'why people in the gym say they would gain weight in autumn and winter and get lean in spring and summer? I would think " why would they gain weight/fat in the first place where they could stay lean all year round? I spoke to a few of them and these are their common answers: IF WE EAT MORE WE