This can be caused by a number of factors **** together.
Dietary factors. This is one of the main reasons why middle-aged women get fat, excessive intake and not consumed in time, naturally easy to cause fat accumulation.
Exercise factor. As people reach middle age, the amount of exercise is not as large as before, and lack of sufficient exercise, so fat.
Internal body factors. Such as metabolism, endocrine, etc., with the increase in age, the function of the body's internal organs will be reduced, easy fat metabolism disorders, thus gaining weight.
Other factors. Such as taking medication or medical obesity caused by the disease process.