I don't know how to eat. i have been dieting for years?

See nutritionist: I am guessing that you think you are overweight and have gone through a number of diets which briefly work but fail in the long run as you resume your usual eating habits. This is a common pattern. A nutritionist can help guide you but ultimately it will be your will power to help yourself.

Balance: Balance your protein and carbohydrate and limit your fat intake.