Dr. Barry Sears Dr. Sears Comments:

Resulting gut hormones, such as GLP-1 and PYY, are the key to satiety.  To release GLP-1, you need to consume very low-glycemic-load carbohydrates, such as non-starchy vegetables.  To release PYY, you need to consume protein.  You need a consistent balance of both to keep hunger under control. That’s one of the secrets of the Zone Diet.