As per Vedic astrology you are Virgo rising and we see that planet Jupiter which is the planet of fat and expansion is in Virgo. As long as Jupiter will remain in Virgo you will gain weight as it is the planet of weight. It is best to cut down on fatty food, control your diet and do regular exercise. After September 2017 you will see much improvement. Till then it is important that you change your life style for the better.