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A low-carbohydrate diet alters cortisol metabolism independently of weight loss. In obese men, this enhances cortisol regeneration by 11beta-HSD1 and reduces cortisol inactivation by A-ring reductases in liver without affecting sc adipose 11beta-HSD1. Alterations in cortisol metabolism may be a consequence of macronutrient dietary content and may mediate effects of diet on metabolic health.
Stimson et al. (Wed,) studied this question.