What do I mean by this? While some may think that the more you do and the faster your lifestyle, the "skinnier" you'll be, this is simply not the case.
Exercise can result in significant muscle fiber tearing, the production of damaging free radicals in the body's tissue, and build-up of toxic metabolites. In the absence of proper recovery and adequate sleep, cortisol hormone levels become elevated and thyroid function decreases. Elevated cortisol levels decrease blood sugar stabilization, decrease utilization of fatty acids as a fuel, decrease testosterone levels, and increase deposition of adipose tissue in the waistline. Low levels of active thyroid hormone can depress your body's basal metabolic rate, or the total amount of calories you burn throughout the day. The result is not only a feeling of chronic fatigue, but also a propensity to gain fat and lose lean muscle tissue.
Combine these effects with the fact that lack of sleep can depress key neurotransmitters involved in regulation of appetite and food cravings, such as serotonin and dopamine. Furthermore, inadequate rest and recovery can decrease leptin (the "fat control" hormone) and increase ghrelin (the "eat more" hormone).
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