PLEASE, David Klein promises 100% cures of a number of things. My advice is to be wary any time you see the words "100%" and "cure" in the same paragraph. Reputable practitioners never claim 100% cure of anything. That would mean every person who ever tried his diet was cured of the stated disease. We know that pretty much nothing in nature is 100%.
Think about it. If he lies about his statistics, then he might just lie about a lot of other things, too.