Food combining
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[Food combining came from Natural Hygiene (Shelton), popularised by Dr Hay (Hay diet) without giving any credit, and more recently by Natural Hygienist Harvey Diamond in his book Fit for Life. Essentially, concentrated carbohydrates (bread, potatoes) don't combine with concentrated proteins (meat), and fruit doesn't combine with either, and should should be eaten first. Poor food combining could be the main cause of bowel cancer and bowel disease, and is the main sin of the food industry--the great big fat LIE that you can mix grain and meat. You never feel good as good feelings come from having a clean, properly working gut.]
REFINED SUGAR The Sweetest Poison of All by William Dufty
See: Acid and alkaline
Books
Fit For Life by 
Diamond   
http://www.sandbox.ca/~rmoore/export/health/ffl.pdf 
Food Combining—Shelton
Food Combining Made Easy---Grant
Quotes
I have observed that people on vegan or fruitarian diets lack proteins. As this 
condition persists, the intestinal tract's ability to develop and produce 
enzymes diminishes. Over a period of years, especially after child-hood, fewer 
food combinations are tolerated because of the lack of certain enzymes. On a raw 
diet that is high in meat enzymes are easily produced and most any combination 
is digestible, except combining vegetation and meats, including vegetable 
juice, because they neutralize the acid fluid and bacteria that digest meat.
Interview with Aajonus Vonderplanitz