The diet is based on Diamond's exploration of Herbert M. Shelton theories of food combining. Both authors claimed to be able to bring about weight loss without the need to count calories or undertake anything more than a reasonable exercise program. In the first version of the program, Diamond claimed that if one eats the foods in the wrong combination they "cause fermentation" in the stomach. This in turns gives rise to the destruction of valuable enzymes and nutrients. Diamond categorized foods into two groups: "dead foods" that "clog" the body, and "living foods" that "cleanse" it. According to<unk>  principles, dead foods are those that have highly refined or highly processed origins; while living foods are raw fruits and vegetables. The basic points of<unk>  are as follows: * Fruits are best eaten fresh and raw. Where possible they should be eaten alone. * Carbohydrates and proteins should never be combined in the same meal. * Water dilutes stomach digestive juices and should never be drunk at meals. * Dairy products are considered of limited value and because of their allergic capacity, should seldom, if ever, be eaten. In the 2000s, the<unk>  system added the Personalized<unk>  Weight Management Program, which employs proprietary protocols called Biochemical "Analyzation", Metabolic Typing and Genetic Predispositions. The Diamonds claim that these protocols allow the personalization of the diet, which thus customized is effective only for one individual, and can be used for that person's entire<unk> . This version of the diet also puts less emphasis on "live" and "dead" foods, and instead talks of "enzyme deficient foods". The Diamonds posit that enzymes that digest proteins interfere with enzymes that digest carbohydrates, justifying some of the rules above. They also began to sell nutritional supplements, advertised as enzyme supplements, many of which are strongly recommended in the newest version of<unk> .
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