If your calories are much over 1500 a day, you won’t lose weight fast enough to stay on your diet. If your carbohydrate intake is much over 10 grams per feeding, you also won’t lose weight fast enough to stay on your diet. If your protein intake is much over 30-40 grams per feeding, you can get sweet and starch cravings from gluconeogenesis, as protein is metabolized to sugar.