Forget dieting. Your weight problem is over if you can learn to eat the way thin people do. According to Dr. Marshall, another formerly fat psychiatrist, you can--must--eat all of your favorite foods if you are to lose weight. But you must eat them only when truly hungry and only until you no longer feel hungry: naturally thin people hate feeling full. These newly concocted behavior-modivication techniques may work for some for a while, but we don't believe Marshall's claim that his plan is ""statistically the most effective method for weight control we have today."" Fat people generally have trouble knowing true feelings of hunger; and keeping a large supply of favorite foods in the house seems a questionable tactic indeed, hardly ideal for bingers, compulsive eaters, and their overweight pals. Dr. Marshall has got a handle on one aspect of the overeaters' problem--regulating the need for rich foods--but his program relies too much on a single concept, skimps on nutrition, and never mentions exercise.