The biggest factor in how much you weigh, in the long run, is your carbohydrate intake. The biggest factor in how much you weigh, in the short run, is your calorie intake. If you want to maintain, keep your carbohydrate intake down to a dull roar, 60-100 grams a day. If you want to lose weight, keep your calorie intake down to a very dull roar, under 1500 calories a day. The American and international obesity epidemic, in the long run and the short run, is too much carbohydrate per feeding, which causes too much fat storage.