Differnce in whey protien and soy?

[wildbill ws6]

Ive been taking 100% whey for a while now but my cousin likes to take soy. Whats the difference?

[BossHawg02]

I would stick with the whey bro....the 100% whey is some of the best protein you can get

[BG5150]

Here's some thoughts:

http://www.bodyandfitness.com/Information/Fitness/protein5.htm

[the doc]

also... whey http://proteinfactory.com/store/product_info.php?products_id=43&osCsid=faae817ca35a5ae412de80fc2b3eb761

soy ... http://proteinfactory.com/store/product_info.php?cPath=22_28&products_id=51

[malkore]

in a nutshell, if you're a woman or a vegan - you go Soy
if you're a man, or a woman - you go Whey (or a Whey blend)

lots of people feel bloated on Soy, and the plant-estrogens in Soy aren't very good for men.

[sharkall2003]

I would go Whey.

[pbsteve09]

most deffinatly whey!!!!

[RickTheDestroyer]

in a nutshell, if you're a woman or a vegan - you go Soy
if you're a man, or a woman - you go Whey (or a Whey blend)

lots of people feel bloated on Soy, and the plant-estrogens in Soy aren't very good for men.

Actually, as it turns out, the phyto estrogens don't do anything to men- to the best of my knowledge they don't do anything for anyone. Turns out we were all just paranoid.

I know that there have been articles posted here in the past that confirm that soy is okay for men- I'll leave that to you guys and the magical search function, as I really don't feel like finding it right now.

I think the more important distinction is that whey is absorbed quickly, and soy is digested at a more moderate pace. My primary protein shake has both, plus slow-digesting casein.

Someone who knows more than me, please step in and let me know if I am mistaken about this stuff- I just figured I'd nip the myth in the bud.

[TheGimp]

As DenimDemon says, soy will digest slowly, somewhere in between whey and casein. This would make it more suitable for a meal replacement shake than whey which is metabolised very quickly. I'd stick to whey for pre/postworkout shakes however.

the plant-estrogens in Soy aren't very good for men.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=12094627

Soy milk intake in relation to serum sex hormone levels in British men.

Allen NE, Appleby PN, Davey GK, Key TJ.

Cancer Research UK Epidemiology Unit, University of Oxford, Oxford OX2 6HE, UK. naomi.allen@cancer.org.uk

Soy beans contain high levels of the isoflavones genistein and daidzein and their glycosides and have been implicated in the prevention of prostate cancer, possibly via their effects on sex hormone metabolism. The aim of this study was to assess the relation between dietary soy intake and sex hormone levels in a cross-sectional analysis of 696 men with a wide range of soy intakes. Soy milk intake was measured using a validated semiquantitative food frequency questionnaire, and serum hormone concentrations were measured by immunoassay. Multiple regression was used to investigate the association between soy milk intake, an index of isoflavone intake, and hormone levels after adjustment for pertinent confounders. Soy milk intake was not associated with serum concentrations of testosterone, free testosterone, androstanediol glucuronide, sex hormone-binding globulin, or luteinizing hormone. These results suggest that soy milk intake, as a marker of isoflavone intake, is not associated with serum sex hormone concentrations among free-living Western men.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=11880595

Hormonal effects of soy in premenopausal women and men.

Kurzer MS.

Department of Food Science and Nutrition, University of Minnesota, St. Paul, MN 55108, USA. mkurzer@umn.edu

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. There has been some concern that consumption of phytoestrogens might exert adverse effects on men's fertility, such as lowered testosterone levels and semen quality. ... Only three intervention studies reported hormonal effects of soy isoflavones in men. These recent studies in men consuming soyfoods or supplements containing 40--70 mg/d of soy isoflavones showed few effects on plasma hormones or semen quality. These data do not support concerns about effects on reproductive hormones and semen quality.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=11767208

Effects of soy protein on levels of remnant-like particles cholesterol and vitamin E in healthy men.

Higashi K, Abata S, Iwamoto N, Ogura M, Yama****a T, Ishikawa O, Ohslzu F, Nakamura H.

First Department of Internal Medicine, National Defense Medical College, Tokorozawa, Saitama, Japan.

We determined the effects of soy protein isolate (SPI) intake on remnant-like particles (RLP), lipolytic enzymes, lipid transfer protein, transaminases, sex hormones, iron, calcium, and vitamin E in healthy men. In the first randomized, crossover experiment, 14 men were given either 20 g per day of SPI or nothing (control) for each 4-week segment. After 3 weeks of SPI intake, TG and RLP cholesterol levels were significantly lower than the baseline by 13.4% (p<0.05) and 9.8% (p<0.05), respectively. However, no significant change was found in total and low-density lipoprotein (LDL) cholesterol levels or the activities of lipoprotein lipase, hepatic lipase, cholesteryl ester transfer protein, and lecithin cholesterol acyltransferase. Although the levels of transaminases. testosterone, iron, and calcium did not change, the vitamin E level was reduced from the baseline by 9.7%, a significant decrease (p<0.01)...


http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=11303585

Effect of soymilk consumption on serum estrogen and androgen concentrations in Japanese men.

Nagata C, Takatsuka N, Shimizu H, Hayashi H, Akamatsu T, Murase K.

Department of Public Health, Gifu University School of Medicine, Japan.

... We conducted a randomized dietary intervention study to determine the effects of soy consumption on serum levels of steroid hormones in men. Thirty-five men were randomly assigned to either a soymilk-supplemented group or a control group. The men in the soy-supplemented group were asked to consume 400 ml of soymilk daily for 8 weeks. The men in the control group maintained their usual diet. Blood samples were obtained just before the initiation of the dietary period and thereafter every two weeks for 12 weeks. Changes in hormone concentrations were analyzed and compared between the two groups using the mixed linear regression model against weeks from the start of the dietary period. The mean (SD) soymilk intake estimated from dietary records during the dietary study period was 342.9 (SD, 74.2) ml in the soymilk-supplemented group. There was a significant difference between the two groups in terms of changes in serum estrone concentrations, which tended to decrease in the soy-supplemented group and increase in the control group over time. None of the other hormones measured (estradiol, total and free-testosterone, or sex hormone-binding globulin) showed any statistical difference between the two groups in terms of patterns of change. The results of the study indicate that soymilk consumption may modify circulating estrone concentrations in men.

http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=10798211

Inverse association of soy product intake with serum androgen and estrogen concentrations in Japanese men.

Nagata C, Inaba S, Kawakami N, Kakizoe T, Shimizu H.

Department of Public Health, Gifu University School of Medicine, Japan.

The cross-sectional relationships of soy product intake and serum testosterone, estrone, estradiol, sex hormone-binding globulin, and dihydrotestosterone were examined in 69 Japanese men. Soy product intake was estimated from a semiquantitative food frequency questionnaire. Serum estradiol concentration was significantly inversely correlated with soy product intake (r = -0.32, p = 0.009), and serum estrone concentration was nonsignificantly inversely correlated with soy product intake (r = -0.24, p = 0.05) after controlling for age, body mass index, smoking status, and ethanol intake. Total and free testosterone concentrations were inversely correlated with soy product intake after controlling for the covariates, but these correlations were of border line significance (r = -0.25, p = 0.05 and r = -0.25, p = 0.06, respectively). Similar correlations were observed for these hormones with isoflavone intake from soy products. The data suggest that soy product intake may be associated with the endogenous hormone levels in Japanese men.

Summary: Soy will most likely not negatively impact your testosterone levels. The latter two studies even suggest that soy consumption could reduce estrogen levels in men.

[malkore]

*limbers up for a moment....reaches down...grasps foot...inserts into mouth*

Glad to see in the two years I've been getting fat, new research has been done.
Still can't bring myself to drink soy milk, but I guess I won't fear the soy from now on.
Thanks Gimp!