Brazilian researchers believe they have discovered why people who don't exercise feel hungrier than people who do. In a study conducted at the Department of Internal Medicine at the State University of Campinas in São Paulo, researchers found that "physical activity reorganizes the set point of nutritional balance through anti-inflammatory signaling," at least in the obese rats they studied.
It turns out that during exercise, the muscles release key proteins that optimize the body's signaling system for hunger. Stated another way, in the unnatural condition of little to no exercise, all aspects of the body's hunger triggering system are not present, which explains in part why couch potatoes experience more intense hunger than triathletes.
The Spartan Diet calls for daily exercise, and relies upon the fine-tuning of your hunger-satiety system for optimizing food quantity (instead of counting carbs or calories).
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