Impact of components of green tea on plasma cortisol concentration was confirmed. It was found that an epigallocatechin-3-gallate inhibits activity of 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1), which participates in conversion of cortisone to cortisol [69, 70]. Figure 3 shows effect of epigallocatechin-3-gallate on balance between levels of cortisol and cortisone.
In contrast to the green, black coffee stimulates secretion of hydrocortisone. Studies of Gavrieli et al. [74] on cortisol levels in men who drank decaffeinated and caffeine-containing coffee showed that for the impact on level of this hormone is responsible caffeine. In addition, it was noted that included caffeine in coffee inhibits evening decrease in cortisol levels.
https://link.springer.com/article/10.1007/s00217-016-2772-3
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