The relationship between lowering cortisol and weight loss is complex and often oversimplified. Chronically elevated cortisol – due to ongoing stress, poor sleep, or certain medical conditions – can promote weight gain through several mechanisms: increased appetite for high-calorie foods, preferential storage of visceral fat, and muscle breakdown. Conversely, reducing cortisol levels (e.g., via stress management, adequate sleep, moderate exercise) may attenuate these effects and indirectly support weight loss. However, the evidence is moderate: most studies show associations rather than strong causal effects. Genetic variants (e.g., in NR3C1) have small, uncertain influences. MyBody-X tests do not measure actual cortisol levels; they only indicate genetic predispositions. For personalized advice, blood or saliva tests and medical evaluation are necessary. A direct 'fat-burning' effect of cortisol reduction is not scientifically supported.
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