This is a low in calories and saturated fat and high in fiber, antioxidants and phytochemicals. The title refers to the idea of eating healthy 90% of the time, while the other 10% you can have "fun foods".

In this plan of 14 days, which can be repeated until the desired weight is thinner by restricting calorie intake between 1200 and 1600, according to their current weight and activity level. 90% of calories should come from the menus that are provided, and the remaining 10% of a list of "fun foods".

The program is based on the control of rations and by allowing food often seems encourages eating in moderate amounts. Physical activity is an important component to losing weight and not to retrieve it.

The author, Joy Bauer, says that you can lose up to 4.5 kg. in the first two weeks, but acknowledges that, in general, much of that weight loss is water loss.

The plan of 90/10 weight loss, one remains a daily menu that includes breakfast, lunch, dinner and snacks. Every day one of a select foods that are fun to eat at any time. If you follow the menus, calorie counting is not necessary, but it is the range of calories for each food in case you can not follow the menu that is provided. The plan offers menus for 14 days, but there are additional menus for variety.

Suggests multivitamins and calcium supplements, and the plan encourages you to drink enough water, coffee, tea and carbonated water. Before starting the diet, the author suggests taking a picture of 'before' and note the sizes of clothing and body measurements, and whether it is possible to measure body fat. Recommends that this be repeated two weeks later, so you can check the progress.

While replacing some of the dinner plans, this program can become monotonous, the program of 1200 calories per day is too restrictive, and few can continue successfully for long periods.