I used to hang out on the boards on McDougall's website, there I found people improving all kinds of diseases by following his diet style. There's an interesting "game" that was sometimes discussed: the idea is, for the recommended daily intake of calories, what foods do you need to eat in a typical day in order to reach the requirements for the RDA levels of all vitamins and minerals? You can use the data in nutritiondata.com or the cron-o-meter. The answer is inevitably something that looks a lot like McDougall's diet. Essentially the only way to get your vitamins and minerals in is to eat plants plants plants...(unless you consume very large quantities of "high nutrient density" foods like spinach).