SOY Protein... Helpful or Harmful???
- 08-15-2007, 06:40 PM
There are 14 dozen eggs per gallon @ ~$35/gal (when you buy 2).
The thing I like is that it doesn't take up the room that 14 dozen eggs do, they stay good for up to 6-8 months, they are pasteurized, easy, convenient, and can be frozen indefinitely if needed.
Not something you can say about 'real' eggs.
I'm not sure what eggs go for at Costco or other bulk places, I think my local safeway is ~$2/dozen (not including buy one, get one) but for the extra few dollars and not having to separate and toss half an egg out, its worth it to be able to just pump it.
- 08-15-2007, 06:57 PM
- 08-15-2007, 09:56 PM
Just saw this thread but would like to say that Soy definitely promotes aromitization...which is a bad thing. Egg protein is a good alternative and has a great amino profile.
08-16-2007, 01:13 AM
C'mon gents....I have to make the same post twice in the same thread. Read the scientific literature!!!
Effect of protein source and resistance training on body composition and sex hormones
Douglas Kalman , Samantha Feldman , Michele Martinez , Diane R Krieger and Mark J Tallon
Journal of the International Society of Sports Nutrition 2007
Published 23 July 2007
Evidence suggests an inverse relationship between soy protein intake and serum concentrations of male sex hormones. Anecdotal evidence indicates that these alterations in serum sex hormones may attenuate changes in lean body mass following resistance training. However, little empirical data exists regarding the effects of soy and milk-based proteins on circulating androgens and exercise induced body composition changes.
For 12 weeks 20 subjects were supplemented with 50 g per day of one of four different protein sources (Soy concentrate; Soy isolate; Soy isolate and whey blend, and Whey blend only) in combination with a resistance-training program. Body composition, testosterone, estradiol and sex hormone binding globulin (SHBG) were measured at baseline and week 12.
Protein supplementation resulted in a significant increase in lean body mass independent of protein source (0.5 1.1 and 0.9 1.4 kg, p = 0.006, p = 0.007). No significant differences were observed between groups for total and free testosterone, SHBG, percentage body fat, BMI or body weight. The Testosterone/Estradiol ratio increased across all groups (+13.4, p = 0.005) and estradiol decreased (p = 0.002). Within group analysis showed significant increases in the Testosterone/Estradiol ratio in soy isolate + whey blend group (+ 16.3, p = 0.030). Estradiol was significantly lower in the whey blend group (- 9.1 8.7 pg/ml, p = 0.033).
This investigation shows that 12 week supplementation with soy protein does not decrease serum testosterone or inhibit lean body mass changes in subjects engaged in a resistance exercise program.
08-16-2007, 03:19 AM
Thanks 'DieTrying', I appreciate the research data.
I have stopped drinking the Soy shakes for about 10 days now. I think it may indeed have just been "all in my head" but I swear my muscles felt softer after a couple weeks of Soy protein shakes.
The only other thing I wanted to mention about that study is "...20 subjects were supplemented with 50 gr. per day..." IMO, 50 gr. per day isn't SH*T... How many of us strive for 200 gr. of protein a day? Given, most of us get some protein from other food sources, but I'd be willing to bet many people reading this consume 150 gr. of protein from shakes daily when bulking.
I have taken into consideration that the study lasted 12 weeks, so I would have thought with that amount of time you'd see a difference in hormone levels.
I probably am just paranoid... I'm not going to get rid of it yet. I'm sure I'll eventually begin taking it again, and this time I'll make a conscious effort to see how I feel and if I notice any differences in muscle tone, size and/or decrease in performance in the gym. I appreciate all the input from everyone!!! You guys rock!
08-16-2007, 06:50 AM
Here is another studay and this one says that soy protein acts like a SERM!
Submitted to: Meeting Proceedings
Publication Type: Abstract
Publication Acceptance Date: March 1, 2006
Publication Date: April 1, 2006
Citation: Ronis, M.J., Gilchrist, J.M., Nagarajan, S., Simmen, F.A., Simmen, R.C., Badger, T.M. 2006. Developmental exposure to soy protein isolate: Potential health effects [abstract]. International Life Sciences Institute Food, Nutrition, and Safety Program. Available: http://www.ilsina.org/programs/food_...promotion.html.
Interpretive Summary: Recently, concerns have been raised about the safety of soy-based baby formula. Soy formulas make up about 25% of the U.S. market and are fed to over 1 million babies each year. Soy protein isolate (SPI) is the sole protein source in these formulas and is made by processing and extracting soy beans. Arguments about health effects have centered around plant chemicals called isoflavones that are naturally found in soy and are structurally related to the female sex hormone estradiol. The major soy isoflavones are called genistein and daidzein, and they weakly bind to estrogen and androgen receptors in the test tube. However, most of the studies have used cells exposed to pure chemicals, or experimental animals injected with genistein or daidzein, and ignore many issues related to feeding soy protein isolate to babies. In particular, the chemical form of isoflavones is different in SPI. In SPI the isoflavones exist as sugar conjugates that have to be digested by gut bacteria before genistein or daidzein can be absorbed into the body. In addition, during absorption these chemicals are re-conjugated to sugars and sulfate. As a result, the tissue levels of isoflavones are 10-fold lower after dietary consumption of SPI, compared to injecting the pure chemicals i.v. In addition, effects of mixtures are often very different from those of pure components and experimental animals including monkeys break down isoflavones significantly differently from babies. We have observed no harmful effects of feeding SPI to rats throughout development including no effects on fertility, reproductive development, or endocrine disruption. The only potentially important health effect we have observed is increases of liver enzymes (CYP3A) that may speed up the break down of some pediatric drugs. In contrast to toxic effects, we have observed health benefical anti-cancer effects and reduced body fat in SPI-fed rats and soy formula fed infants associated with increased fat breakdown.
Technical Abstract: Soy protein isolate (SPI) is the sole protein source in soy infant formulas, which constitute approximately 25% of all formula sold in America. No reports of significant health problems associated with soy formula feeding have appeared in the more than 20 million infants fed soy formulas since they came on the market. However, health concerns have been raised as the result of the presence of some plant-derived chemicals (the phytochemicals called isoflavones) found in SPI. The major isoflavones in SPI are genistein and daidzein. These compounds and the daidzein metabolite equol, which is made by gut bacteria during the digestion of soy products, are structurally similar to the female hormone 17 beta-estradiol and have been called phytoestrogens. They have been shown to have weak binding to estrogen receptors with activity similar to selective estrogen-receptor modulators (SERMS) such as the breast cancer drug tamoxifen. They have been shown to stimulate or inhibit estrogen signaling depending on dose, levels of endogenous estrogens, and relative expression of estrogen receptor alpha or beta in the target cells. In some studies, isoflavones also appear to have anti-androgenic activities such as the ability to reduce testosterone concentrations. There is controversy regarding possible safety issues associated with soy formula consumption based on early exposure to high concentrations of these isoflavones (4-7 mg/kg/d), and as a result, several governments have issued restrictions against soy-based formulas. The toxicity issues raised relate to possible endocrine disruption, including effects on fertility, increased cancer risk, and immune dysfunction. Safety fears have been based largely on studies in which pure isoflavones have been administered to laboratory animals at high doses, often by routes other than the diet: in vitro cell culture studies and animal studies in which SPI has been administered following castration to remove normal sex steroids. These studies have largely ignored important dose-response issues, the role of metabolism by gut microflora and metabolism during first pass intestinal absorption, species differences in isoflavone metabolism, the complexity of SPI which contains many different phytochemicals and bioactive peptides or proteins, and interactions between isoflavones and normal steroids. In studies in our laboratory, feeding diets containing SPI as the sole protein source to Sprague Dawley rats results in no significant effects on fertility, reproductive or endocrine development relative to rats fed casein-based diets. We have observed no changes in weight of testis, ovary or secondary sex organs, and no changes in normal sex hormone concentrations during development. The only potential safety issue we have observed is increased expression of CYP3A enzymes in the livers of rats fed SPI compared to casein which might be associated with faster breakdown of some pediatric medications. In contrast, we have observed protection against chemically induced breast and colon cancer in rats fed SPI. Breast cancer protection was associated with significant increases in mammary gland differentiation and impaired signaling through a transcription factor in SPI-fed rats called the Ah receptor which normally stimulates metabolic activation of chemical pro-carcinogens. In addition we have seen increased cell death in breast tumor cells exposed to serum from SPI-fed rats in the test tube. These data are consistent with population studies indicating that soy consumption is cancer protective. In addition, we have data from animal models and soy-fed infants showing reduced body fat and protection against development of coronary artery disease in apoE knockout mice models. We have also demonstrated reduced fatty liver, and cholesterol content associated with activation of a number of liver nuclear receptors incl
08-17-2007, 10:01 AM
And what of all this?
Soy Dangers Summarised
High levels of phytic acid in soy reduce assimilation of calcium, magnesium, copper, iron and zinc. Phytic acid in soy is not neutralized by ordinary preparation methods such as soaking, sprouting and long, slow cooking. High phytate diets have caused growth problems in children.
Trypsin inhibitors in soy interfere with protein digestion and may cause pancreatic orders. In test animals soy containing trypsin inhibitors caused stunted growth.
Soy phytoestrogens disrupt endocrine function and have the potential to cause infertility and to promote breast cancer in adult women.
Soy phytoestrogens are potent antithyroid agents that cause hypothyroidism and may cause thyroid cancer. In infants, consumption of soy formula has been linked to autoimmune thyroid disease.
Vitamin B12 analogs in soy are not absorbed and actually increase the body’s requirement for B12.
Soy foods increase the body’s requirement for vitamin D.
Fragile proteins are denatured during high temperature processing to make soy protein isolate and textured vegetable protein.
Processing of soy protein results in the formation of toxic lysinoalanine and highly carcinogenic nitrosamines.
Free glutamic acid or MSG, a potent neurotoxin, is formed during soy food processing and added to many soy foods.
Soy foods contain high levels of aluminum which is toxic to the nervous system and the kidneys.
SOY INFANT FORMULA — BIRTH CONTROL PILLS FOR BABIES
Babies fed soy-based formula have 13,000 to 22,000 times more estrogen compounds in their blood than babies fed milk-based formula.
Infants exclusively fed soy formula receive the estrogenic equivalent of at least five birth control pills per day.
Male infants undergo a “testosterone surge” during the first few months of life, when testosterone levels may be as high as those of an adult male. During this period, baby boys are programmed to express male characteristics after puberty, not only in the development of their sexual organs and other masculine physical traits, but also in setting patterns in the brain characteristic of male behavior.
Pediatricians are noticing greater numbers of boys whose physical maturation is delayed, or does not occur at all, including lack of development of the sexual organs. Learning disabilities, especially in male children, have reached epidemic proportions.
Soy infant feeding—which floods the bloodstream with female hormones that inhibit testosterone—cannot be ignored as a possible cause for these tragic developments. In animals, soy feeding indicates that phytoestrogens in soy are powerful endocrine disrupters.
Almost 15 percent of white girls and 50 percent of African-American girls show signs of puberty such as breast development and pubic hair, before the age of eight. Some girls are showing sexual development before the age of three. Premature development of girls has been linked to the use of soy formula and exposure to environmental estrogens such as PCBs and DDE.
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