Viewing a single comment thread. View all comments

TheRightening t1_it2ktjb wrote

Reply to comment by glichez in Protein quality of soy and the effect of processing: A quantitative review. This quantitative review confirms that the majority of soy products have high protein quality scores. by grandlewis

As someone that does strong man lifting, I have to be conscious of my testosterone levels and soy threatens that. Soy is a great source of protein for women.

−9

18Apollo18 t1_it48my9 wrote

Data shows that vegan men have just as high if not higher testosterone levels while simultaneously having a low risk for prostate cancer

In a well characterized national database, the plant-based diet index is unable to predict testosterone levels. Plant-based food content in diet is not associated with serum testosterone levels.

There is little evidence from intervention studies that diet is related to serum androgen levels, with changes to both low-fat and high-fat diets having been reported to reduce testosterone, FT and DHT concentrations over the short-term. Data from observational studies do not support the hypothesis that a diet low in saturated fatty acids is associated with lower androgen concentrations. Indeed, there is a tendency for testosterone levels to be slightly higher among vegans than meat-eaters, most probably as a direct response to an elevated SHBG concentration. A vegetarian and/or low-fat diet also has not been shown to influence LH levels, further implying that effects on androgens are insufficient to provoke a gonadotropic response. Given the absence of clear effects of diet on androgens, the lack of dietary effect on oestrogens would be expected because circulating oestrone and oestradiol in men are largely derived from peripheral conversion of androgens. One explanation as to why diet does not appear to elicit substantial differences in circulating androgen levels is due to the body's natural feedback mechanism to maintain the internal environment. Indeed, the small increase in testosterone concentration observed among vegan men is almost certainly caused by the increase in SHBG, in order to maintain a constant level of FT. However, in a much larger study, vegetarian and vegan men who were known to consume soyabean regularly were not found to have lower A-diol-g levels than meat-eaters (Allen et al. 2000). It may be that soyabean consumption among Western vegetarians is not sufficient to exert physiological effects.

Mean serum insulin-like growth factor-I was 9% lower in 233 vegan men than in 226 meat-eaters and 237 vegetarians (P = 0.002). Vegans had higher testosterone levels than vegetarians and meat-eaters, but this was offset by higher sex hormone binding globulin, and there were no differences between diet groups in free testosterone, androstanediol glucuronide or luteinizing hormone.

Vegans had 13% higher T concentration than meat-eaters (P = 0.0001) and 8% higher than vegetarians (P = 0.001); adjustment for BMI reduced these differences to 6% (P = 0.07) and 7% (P = 0.02), respectively. The results did not support the hypothesis that meat-eaters have higher levels of bioavailable androgens than non meat-eaters. No differences in hormone levels were found between meat-eaters and lacto-ovo-vegetarians, suggesting that vegetarian diets may not alter prostate cancer risk, but the relatively low IGF-I levels in vegans might reduce their risk of prostate cancer

6

TheRightening t1_it5nxjp wrote

Vegan men, carnivorous men, pescatarian men that eat soy have higher levels of serum estrogen than those that avoid it altogether. https://www.montana.edu/hhd/graduate/dietetics/blog_posts/Soy_hormonal_health.html

0

18Apollo18 t1_it6bk86 wrote

The study referenced literally found reduced estrogen levels in the soy milk group.

Estrone concentration tended to decrease in the soymilk-supplemented group [regression parameter β (SE) = −0.003352 (0.00226)] and increase in the control group [β (SE) = 0.003228 (0.00223)] over the study period. None of the other hormones measured showed any statistical difference in changing patterns between the two groups.

Nagata, , Takatsuka, N., Shimizu, H. The effect of soymilk consumption on serum estrogen and androgen concentrations in Japanese men. Cancer Epidemiol Biomarkers. March 1, 2001 10(3) 179-184.

6

TheRightening t1_it7t9lk wrote

Estrone and Serum Estrogen are not the same thing. The confirmation bias is cute though.

−2

18Apollo18 t1_it8489j wrote

>Estrone and Serum Estrogen are not the same thing

Are you missing the part where they said no difference was found in any other hormones measured??

Also estrone is one of the 3 types of estrogen commonly tested in the blood

There are many types of estrogen, but only three types are commonly tested: Estrone, Estradiol, and Estriol

https://medlineplus.gov/lab-tests/estrogen-levels-test/

>The confirmation bias is cute though.

How the hell is it conformation bias? That's literally the study cited by the source you sent to me

3

sdomtihstae t1_it3j08t wrote

> Soy is a great source of protein for women.

I enjoy how you lay out for all to ponder in an open reasoned scientific dialogue. Nice!

5

TheRightening t1_it5mvw3 wrote

I'm not trying to have a debate with people to lazy to do their own research.

0