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This is a true story of a military man who grew breasts and went to four doctors before someone figured out that his soymilk habit was the problem. A case report on his condition was published in the May/June 2008 issue Endocrine Practice. The article also addresses the popular conception that soy is "healthy", and the fact that soy products are used in infant formulas--to the detriment of the developing children.

--the military man in question was drinking 3 quarts/day of soy milk
--research suggests that soy may extend life
--1999, soy protein earned FDA-allowed health claim: "Diets that include 25 grams—about a pound of tofu--a day may reduce the risk of heart disease."
--soy is in most everthing, including Ensure

--some studies show soy may protect against prostate cancer
--soy contains phytoestrogens: genistein and daidzein
--theor has it these chems are plant defenses vs fungi or grazers
--some studies suggest that even 25gms/day may "feminize" hormones
--cheap and vegetarian

--35% of bottle-fed babies in US get some prot from soy
--American Academy of Pediatrics (AAP) recommends cow's milk over soy for 1st alternative to breast milk
--the medical necessity that sometimes indicates use of soy for infants: lactose intolerance
--Paul Cooke, Ph.D., reproductive biologist at University of Illinois
--studies mice on enough genistein to make their blood levels same as infants on soy formula
--worrisome findings incl: shrinkage of thymus gland, where WBC's mature
--2001 JAMA study: 800 adults, ages 20-34 who were fed either soy or cowmilk formula
--differences: soy group has more asthma and takes more allergy meds
--2005 Israel's health ministry recommended that soy products be limited in kids and avoided for infants
--France, New Zealand, and Australia have already made such statements

--weighlifters are major market for soy protein
--William Kraemer, Ph.D., a prof of kinesiology
--researcher of strength training and human performance at University of Connecticut
--he observes that soy powder in juice is how many athletes take in soy
--labels say it builds muscle
--protein powders usu are: soy, whey, and casein
--whey and casein cost more than soy
--2005 study in Journal of Nutrition, researchers compare soy to casein
--conclusion: soy biologically less valuable to humans than casein
--more soy degraded to urea, and it contributes to less protein synthesis
--whey has more robust bio effects than soy
--soy might decrease test and increase estradiol

--Harvard study published last year in the journal Human Reproduction
--Jorge E. Chavarro, M.D., Sc.D.
--assoc btw soy consumption in men and decreased sperm counts
--high soy intake category averaged 32% fewer sperm/ml of ejaculate than soy-free men

--2 other papers say that at least one soy component impairs erectile function in animals
--published in the Journal of Andrology and Urology respectively
--effect of daidzein on the sexual function of male rats
--moderate doses given in youth or adulthood of rats
--either way erections were affected
--daidzein-exposed males produced less testosterone, had softer erections, and experienced biochemical changes to their penile tissues that left these tissues less elastic/engorgable
--animal studies don't tell the human story, but researchers think these findings may apply
--there's 10% higher incidence of ED in Chinese men who eat lots of soy compared to Americans who eat none
--Urology study authors concurred
--Yufeng Huang, M.D., coauthor on both papers
--dose given in animal studies-->same level of daidzein as in men who eat soy daily
--he thinks soy is a novel and previously overlooked risk factor for ED
--"We are now recommending that soy be avoided by patients with erectile dysfunction"
--also that men over 40 reduce soy intake

--new study on soy and dementia risk
--last summer, Eef Hogervorst, Ph.D., of England's Loughborough University
--focused on older Indonesians, tofu is a staple in diet
--both men and women
--team began study confident of finding a benefit, found the opposite
--over 68 eating most tofu has double risk of dementia and memory impairment
--compared with those in study who ate the least


( 1 comment — Leave a comment )
Jun. 17th, 2009 10:58 pm (UTC)
response to above article from my nutrition prof
Wow, 3 quarts of soy milk a day. That certainly isn't "moderation" is it? But still surprising, I wonder if this person's hormone metabolism is normal (liver dysfunction? deconjugating colon flora?).

A lot of the science reviewed contrasts with Dr. Austin's well-documented article that I posted this semester, so I am attaching it here so everyone will have both articles to look at. Just one example of possible misinterpretation in the Men's Health article is this one:

......a 2001 study in the Journal of the American Medical Association surveyed over 800 adults, ages 20 to 34, who were fed either soy-based or cow's-milk formulas during their infancy. One of the few differences to emerge was that the group raised on soy formula regularly used more asthma and allergy medications in adulthood.

As a retrospective observational study, it would be hard to attribute cause and effect to the use of soy formula. In fact, wouldn't the use of soy formula indicate that the infant had been dairy intolerant, hence the switch to soy? So use of soy formula could just be a marker for a person born with allergic tendencies, and it wouldn't be surprising that they would take more allergy medication in their lifetime.

Jim G
( 1 comment — Leave a comment )



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