Stress is like fire: When controlled and used for a purpose, it serves us well. Left unbridled, it can consume us. In amounts that our body is capable of adapting to, certain stresses are beneficial. Exercise, for example, is a stress.
When more nutrient-rich foods are present in the diet, the body does not have to eat as much as it would with less nutrient-rich foods. In addition, when the body is fed the nutrients it needs, the brain turns off the hunger signal. And so, the need to continually consume, a state many people who subsist on a refined-food diet experience, ceases, and not as much needs to be eaten and digested.