Fat people are anxiety ridden and handle their anxiety through overeating. The biggest enemy of the fat man is self-hate. Cheese, nuts, crackers, and pizza are extremely destructive. Compulsive use of the scale can be discouraging. You can't just eat wildly and indiscriminately.
Obesity requires controlling for a lifetime.
We know that the obese individual has at one or another times in his life been ten or more pounds overweight for at least ten years. It is disastrous to labor under the delusion that you are not obese when in fact you are.