According to Ahn-Jarvis et al. (2015), soy protein alters the physiological responses in men and disrupts estrogen levels. The active ingredient in soy, isoflavones, behaves like estrogen.
What are the effects of soy on men?
Soy consumption in males can lower men’s natural estrogen levels. This can have so-called “ feminizing effects ” which cause guys to lose their appetite for sex ( 3 ). It can also cause some men to have emotional mood swings reminiscent of a hormonal woman, although this effect has little scientific evidence to back it up.
Is soy bad for males?
Soy consumption isn’t bad for men. In fact, soy is a rich source of high-quality proteins and other nutrients with massive health benefits. Because of large amounts of isoflavones and plant estrogens, soy can help protect you from many chronic illnesses.
The next thing we asked ourselves was is soy phytogenic for men?
In March 2002 the Journal of Nutrition published results of a survey of men consuming soy foods or supplements containing 40-70 milligrams of isoflavones (the phytogenic components).
Do soy products feminize men?
Soy contains phytoestrogens, substances that mimic the effect of the dominant female hormone estrogen. Researchers are still studying the effects of phytoestrogen in both men and women, but a diet high in soy does not appear to cause feminization in men.
You could be thinking “Does soy have feminizing effect on men?”
The most common answer is; the intervention data indicate that isoflavones do not exert feminizing effects on men at intake levels equal to and even considerably higher than are typical for Asian males. Soybean isoflavone exposure does not have feminizing effects on men: a critical examination of the clinical evidence.
Given the huge populations of Asian countries there’s no reason to think that soy affects male fertility, either.
A comprehensive study published in the journal Fertil Steril showed that soy did not have feminizing effects, even when soy was consumed at levels much higher than those of asian men. This has been the case in repeated studies.
Do soy protein and isoflavones affect reproductive hormones?
Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis.