After battling his own weight problem for years, Berkowitz discovered that if he switched from diet to diet, he could lose weight without getting bored and, therefore, without going off the diet as frequently. So we have hyped up: the meaning of ""ideal weight"" (it depends on basic body type), ""diets we don't use and why"" (low carbohydrate is one, though Berkowitz later recommends a high protein diet which is essentially the same thing), and the Berkowitz Diet Switch explained. Six familiar diets are set out (all of which allow for splurging), along with quizzes to help dieters work out individual programs. Other--questionable--main points: big breakfasts aren't essential; exercise is not all that important; dieters don't need detailed menus or food lists because they can figure those things out themselves; we should all ""skip a meal now and then""--in order to ""know real hunger and enjoy the next meal ten times as much."" Altogether, there's a lot of do-it-yourself here--like easing into the ""Six Small Meals a Day"" diet by beginning ""with four or five, or, on the other hand, seven or eight. . ."" For the reader who doesn't expect anything new, and can adhere to a laissez-faire diet, fine--though those who can do that probably don't need Berkowitz in the first place.