Lay opinion vs evidence: Cortisol Ernährung

The popular claim that specific diets can significantly lower cortisol levels is only partially supported by evidence. Cortisol, the primary stress hormone, is regulated by the HPA axis and influenced by many factors beyond diet. Nutritional strategies such as stabilizing blood sugar (avoiding spikes and crashes), ensuring adequate magnesium and vitamin C intake, and limiting caffeine and ultra-processed foods may have modest modulating effects. Observational studies link Mediterranean-style diets with lower cortisol, but causality is unclear. The effect size of dietary changes alone is small compared to stress management, sleep, and exercise. Some supplements like ashwagandha or rhodiola show moderate effects in randomized trials, but results are inconsistent. Overall, evidence is moderate: plausible mechanisms exist, and some human studies support a link, but no specific diet has been proven to reliably lower cortisol in the general population. Consumers should be wary of marketing claims promising 'cortisol-lowering diets' without addressing lifestyle factors. The most evidence-based approach is a balanced diet combined with stress reduction techniques.