In men, regular intake of soy protein may reduce the risk of developing prostate cancer. Soy protein also has the potential to reduce testosterone levels and interfere with fertility, but only when consumed in excess — no such effects have been observed from the daily consumption of 10–70 grams of soy protein or 60–240 mg of isoflavones.
Soy has got a lot of bad press over the years. It has been linked to lowering testosterone in men and increasing phytoestrogens (dietary oestrogens). This has only been noted in isolated cases where the intake of soy protein was extremely high and the diet itself was unbalanced. 7
Although soy has some bad effects to men' health and women's health, this food can help men prevent male prostate cancer. It is amazing, isn't it? The antioxidants and phytoestrogen in soy milk and other product made from soy can help lower blood testosterone levels and then prevent the cell mutation.
For women, a large-scale study at a Boston fertility center showed female consumption of soy improved birth rates for couples undergoing fertility treatment.  And for men, soy intake had no negative impact on fertility. A study at Harvard University found men's soy intake was unrelated to the clinical outcomes on fertility. 
Soy products contain varying amounts of protein. Foods that contain soy protein isolate, for example, have the highest amount of protein, followed by soy flour, whole soybeans and finally, tofu. This is important because the potential negative side effects of soy may be related to the level of proteins and isoflavones in soy.
4 Health Consequences of Soy for Women. Soy milk is heralded as being a healthy alternative to dairy, with many proponents noting its low levels of saturated fat and absence of dietary cholesterol. Despite these claims, soy contains phytoestrogens, compounds that can disrupt hormones.
Soy supplements may contain soy protein, isoflavones (compounds that have effects in the body similar to those of the female hormone estrogen), or other soy components. How Much Do We Know? Although there have been many studies on soy products, there are still uncertainties about soy's health effects.
Soy is like that date who demands affection while refusing PDA and cuddling. Even though soy is packed with lean protein, it's also packed with trypsin and protease inhibitors—enzymes that make the digestion of protein incredibly difficult, causing some gastric distress along with a deficiency in amino acid uptake if soy is eaten in excess.
There may be a hidden dark side to soy, one that has the power to undermine everything it means to be male. A lean and wiry man, the breast development stood in stark contrast to the rest of his body. But it was not Price's only symptom. His beard growth had slowed, he'd lost hair from his arms, chest, and legs,...
Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis. Fertil Steril. 2010;94:997-1007. Messina M. Soybean isoflavone exposure does not have feminizing effects on men: a critical examination of the clinical evidence.
Once again, soy wins out in the battle of whey vs. soy for women. Soy contains phytoestrogens (plant chemicals that mimic the effects of estrogen), and experts often recommend turning to soy as natural alternative to hormone therapy in post-menopausal and peri-menopausal women. Keep in mind, however, that studies are promising but controversial.
Men and women who consume a higher amount of dietary phytoestrogens, such as isoflavones from soy, seem to be less likely to develop lung cancer than people who consume smaller amounts. Soy seems to prevent lung cancer more in men than women. However, some research suggests that only non-smokers, not smokers,...
Two trials noted extremely robust reductions in response to soy; one compared the effects of 25 g/day soy protein from soynuts with a diet containing a similar amount of protein in postmenopausal women and the other compared the effects of one liter per day of soymilk with one liter of cow's milk in men . However, in the vast majority of trials the reductions reported are much more modest.
For example, daily administration of soy supplements providing 0.7–1.5 mg/kg isoflavones over 5 or 12 weeks did not alter serum lipids in men or women with average cholesterol levels [87,176,103,182], but lowered LDL levels have been reported in hypercholesterolemic women following soy isoflavone therapy .
Though the data was inconsistent, it was found that soy protein decreased serum testosterone levels in healthy men. Soy protein is said to have adverse effects on the male reproductive function. Animal studies demonstrate feminization, erectile dysfunction, and infertility in males when given soy foods/isoflavones (7).
Soy: What Every Man Needs to Know Written by Cathy Zhu on April 28, 2012 Though soy is commonly touted as a great addition to a healthy diet, some evidence suggests going overboard could result in ...
Soy Consumption Effects on Men - The Good and the Bad. It is well-known that eating soy is healthy but recent specific studies show soy's protective effects on our body. Soy consumption has effects on bone health, cholesterol and muscle strength. Soy helps fight prostate cancer. Read on to know more.
Soy is unique in that it contains a high concentration of isoflavones, a type of plant estrogen (phytoestrogen) that is similar in function to human estrogen but with much weaker effects. Soy isoflavones can bind to estrogen receptors in the body and cause either weak estrogenic or anti-estrogenic activity.
No feminizing effects have been seen in men consuming normal amounts of soy foods. Soy and Thyroid Problems: A review of the literature demonstrates that women with normal thyroid function and normal dietary iodine intakes are not at risk for developing thyroid problems.
In a review of 15 studies in men, intake of soy foods, protein powders or isoflavone supplements up to 70 grams of soy protein and 240 mg of soy isoflavones per day did not affect free ...
Also, for men, and according to a separate study, (4) Introducing estrogenic goods like soy into the diet of male subjects, can cause men to experience a loss of libido, decreasing their natural, sexual drive; another study found that for both men and women, soy may be a contributing factor behind male and female infertility (5).
But over the years, some men who've incorporated soy-based products, particularly soy milk, into their diet have experienced negative side effects that seem to undermine the health benefits that soy has to offer. So is soy milk really as healthy for men as it seems? What Is Soy? Soy is a legume that grows in a pod like other beans.
The debate centers around the fact that soy protein contains isoflavones which are known to have an estrogen-like effect on the body. Also known as phytoestrogens, these compounds are implicated in the claims that soy products result in testosterone levels falling among men that consume them.
Over the past few years, there has been increasing interest in the possible hormonal effects of soy and soy isoflavone consumption in both women and men. Soy consumption has been suggested to exert potentially cancer-preventive effects in premenopausal women, such as increased menstrual cycle length and sex hormone-binding globulin levels and decreased estrogen levels.
Soy protein and isoflavones may have minimal effects on blood estrogen levels in postmenopausal women and in men. In premenopausal women who have much higher natural estrogen levels, eating soy protein likely has no effect. Cooking tofu in a stir fry pan. (Image: Howard Shooter/Dorling Kindersley RF/Getty Images)
Epidemiological studies have found that soy protein may reduce the risk for cancers including breast, colon, and prostate. 1 Studies show that women who include soy products in their routine are less likely to develop breast cancer, compared with other women.
Impairment of kidneys, kidney stones, and renal failure are the probable side effects of taking protein supplements in excess quantities. 5. Can Disrupt Hormones. Hormonal disruption is the major issue when it comes to soy-based protein supplements. While soy is rich in essential amino acids, it is also loaded with phytoestrogen . Phytoestrogen ...
Soy included. Current evidence suggests that excessive intake of soy protein may lead to decreased testosterone/estrogen ratio and attributed side effects in men, with the effect likely mitigated by increasing regularity of physical activity, primarily resistance training.
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