Its not quackery.
It kinda is
No, it is. This has been a much studied and debunked diet. The latest addition is the acid/alkaline connection. If that worked, one could pop a Tums with any meal and drop weight. It’s silly.
Here is a book from Amazon
http://www.amazon.com/Eat-Right-Your-Type-Individualized/dp/039914255X
Go to the 1 star reviews. There is real science there.
This lady lost weight because the diet restricted her calories (or maybe dropped her carbs).