In order to change permanently you have to put yourself on a mental diet. Starve yourself of those old beliefs and thoughts. Fad diets afford only temporary change. Stats show that only 5% of people who have lost weight on a diet will remain slim. The rest return to their previous overweight condition. Why? Because the still indulge in old unhealthy thought patterns.
The most fundamental way to make permanent long-term change involves changing beliefs. When the inner mind of an individual changes, the rest of the body follows.