Add Yahoo as a preferred source to see more of our stories on Google. Dr. Barnard explains that all foods, after they are digested in the chemistry lab of our body, leave by-products in our system.

A yearning for a cheesy slice of pizza, a sudden urge for chocolate, a desperate longing for that wedge of cheesecake still in the fridge. As many of us know, desire and food can be synonymous. "Food ...