This foolish diet book, which sold over one million copies, shows how a weight loss program founded on unscientific concepts can be a huge commercial success. This toxifies the body and makes people fat. The Diamonds contend that people gain weight not due to overeating and inadequate exercise, but because they eat protein rich foods at the same time they eat starchy foods. As a result, the Diamonds claim, food cannot be digested when they are eaten together. These theories totally disagree with our knowledge of physiology and nutrition.
Food combining frequently contradicts itself.
If so much of our food is not completely digested, then many of the calories consumed would be lost in the stools and couldn't be stored as fat. Decreased calorie absorption causes weight loss, not weight gain. Eating animal and vegetable protein in the same meal causes more efficient utilization of the vegetable protein. Likewise, the non-heme iron in plant foods is better absorbed when consumed with meat or another source of heme iron. Some people did lose weight by following the dietary advice in Fit for Life because low calorie fruits and vegetables were emphasized.