The Optimal Diet is very much against the Food Pyramid concept and yet it claims to be of great benefit and to nearly cure many modern diseases including Diabetes.
The carbohydrate proportion recommended is very different from 60%. The Fat content of an Optimal Meal is definitely greater than 15%. Animal fats are a must not a poison.
My understanding of this Diet is simply that in the translation from Polish to English the word Cure should have been really control.On reading the book the indication is that you need to maintain the Diet to cure Diabetes - if a diabetic was cured then I would presume he could eat anything.