-20% Reduction in Serum Testosterone by 5 Cups of Green Tea. Endocrine Effects Depend on Catechin Composition.
|Image 1: Another SuperFood gone bad? More than 2-3 cups of green tea could do more harm than good to health-conscious male tea-consumers.|
|Figure 1: Molecular structure of the four major green tea catechins (from Kao. 2000)|
In view of the fact that a 2006 analysis of 19 commercially available green tea extracts (Seeram. 2006) revealed that major differences in terms of total catechin content and ratios, the individual effect of "your" green tea caps may be either beneficial or detrimental to your testosterone levels depending on the ratio of (EC+EGC)/(ECG+EGCG) - where a higher amount of the pro-testostosterone fraction, i.e. EC + EGC would obviously be preferable.
|Figure 2: Reduction in sperm count after 26 days of consumption of green tea equivalent to 5, 10 or 20 cups of green tea (data calculated based on Chandra. 2011)|
|Figure 3: Catechin composition and pro- to anti-testosterone ratio of the green tea that was used in the study (Chandra. 2011)|
|Figure 4: Reduction in serum testosterone after 26 days of consumption of green tea equivalent to 5, 10 or 20 cups of green tea (data calculated based on Chandra. 2011)|
Weight loss or lack of weight gain, reduced testosterone, increased LH and all the other negative side effects aside, I would be surprised if low to moderate green tea consumption (2-3cups max.) would actually reduce your chance of conception, hamper your gains in the gym or even induce testicular failure. After all, neither Japan nor China or the other Asian Countries, the inhabitants of which have been having their well-deserved daily cup of (green-)tea for centuries, now, seem to have rampant fertility issues ;-)