Diets and dieting are not the solution to your stubborn weight problem. They are among the main causes. Learning how to eat well habitually, in a way that is more enjoyable than what you do now, is the solution -- and it is not just a matter of "willing" it.
Even Hippocrates hinted at this powerful connection when he said that he would rather know what sort of person has a disease than what sort of disease a person has. He also said that natural forces within us are the true healers of disease.