The aim of this study was to determine if a change in protein/carbohydrate ratio influences plasma steroid hormone concentrations. There is little information about the effects of specific dietary components on steroid hormone metabolism in humans. Testosterone concentrations in seven normal men were consistently higher after ten days on a high carbohydrate diet (468 +/- 34 ng/dl, mean +/- .) than during a high protein diet (371 +/- 23 ng/dl, p less than ) and were accompanied by parallel changes in sex hormone binding globulin ( +/- nmol/l vs. +/- nmol/l respectively, p less than ). By contrast, cortisol concentrations were consistently lower during the high carbohydrate diet than during the high protein diet ( +/- micrograms/dl vs. +/- micrograms/dl respectively, p less than ), and there were parallel changes in corticosteroid binding globulin concentrations (635 +/- 60 nmol/l vs. 754 +/- 31 nmol/l respectively, p less than ). The diets were equal in total calories and fat. These consistent and reciprocal changes suggest that the ratio of protein to carbohydrate in the human diet is an important regulatory factor for steroid hormone plasma levels and for liver-derived hormone binding proteins.
Hi Ali: Regarding the mint studies…I just saw this on Suppversity…regarding the difference between mints effects on male and female rats…..Spearmint (M. spicata): At least in women spearmint tea has been shown to increase estrogen and luteinizing hormone in the follicular phase of their menstrual cycle (Aktodgan. 2007). In a 2004 study that was conducted on male rodents, on the other hand, the daily administration of peppermint tea (M. spicata) for a period of 30days lead to significant increases in luteinizing and follicle stimulating hormone and increases in serum testosterone, yet with the serious downside of “extensive degenerative changes in the germinal epithelium and spermatogenesis arrest compared with the findings in the testicular biopsies of the control group” (Aktogan. 2003) interesting for sure!