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Sleep apnea is associated with abnormalities in metabolic function. First, there is a strong epidemiological link between central obesity and sleep apnea. Some evidence suggests that sleep apnea may promote weight gain or prevent weight loss by several mechanisms: reduction in anabolic (growth hormone and testosterone) hormone secretion, influences on energy balance and insulin sensitivity, and altered central serotonergic tone.
Ronald R. Grunstein (Sun,) studied this question.