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Old 04-20-2009, 10:19 AM   #1
Garrett Smith
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Default Unfermented soy...(men) just don't do it!

Soy food and isoflavone intake in relation to semen quality parameters among men from an infertility clinic
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BACKGROUND: High isoflavone intake has been related to decreased fertility in animal studies, but data in humans are scarce. Thus, we examined the association of soy foods and isoflavones intake with semen quality parameters.

METHODS: The intake of 15 soy-based foods in the previous 3 months was assessed for 99 male partners of subfertile couples who presented for semen analyses to the Massachusetts General Hospital Fertility Center. Linear and quantile regression were used to determine the association of soy foods and isoflavones intake with semen quality parameters while adjusting for personal characteristics.

RESULTS: There was an inverse association between soy food intake and sperm concentration that remained significant after accounting for age, abstinence time, body mass index, caffeine and alcohol intake and smoking. In the multivariate-adjusted analyses, men in the highest category of soy food intake had 41 million sperm/ml less than men who did not consume soy foods (95% confidence interval = –74, –8; P, trend = 0.02). Results for individual soy isoflavones were similar to the results for soy foods and were strongest for glycitein, but did not reach statistical significance. The inverse relation between soy food intake and sperm concentration was more pronounced in the high end of the distribution (90th and 75th percentile) and among overweight or obese men. Soy food and soy isoflavone intake were unrelated to sperm motility, sperm morphology or ejaculate volume.

CONCLUSIONS: These data suggest that higher intake of soy foods and soy isoflavones is associated with lower sperm concentration.
... the whole study is available as a free PDF at the above link.
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Old 04-20-2009, 11:21 PM   #2
Blair Lowe
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Thanks. More ammo for my argument against soy.
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Old 04-21-2009, 06:55 AM   #3
Joe Hart
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So if vegans continue to eat soy they will become extinct? Just kidding...sort of. I can't stand the texture of soy.
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Old 04-21-2009, 07:20 AM   #4
Darryl Shaw
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Imagine how overpopulated China would be if they hadn't been eating soy for the past 5000 years.
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Old 04-21-2009, 07:32 AM   #5
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Darryl, from everything I've read they would eat it as almost a condiment (not a main dish, definitely not in fake meat and milk form as the main source of protein) and it was nearly always fermented.

Very different from today.
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Old 04-21-2009, 07:53 AM   #6
Darryl Shaw
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Garrett,

You're right; when consumed in the traditional asian manner soy doesn't pose any health problems so the only people who really need to be concerned about soy are those who rely on it as their main source of protein.

Question: if the amount of soy consumed by hippy vegans means they're less likely to reproduce should we really be warning them about it or should we just keep quiet and hope they become extinct?
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Old 04-21-2009, 08:24 AM   #7
Garrett Smith
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I'd say keep quiet. They wouldn't believe us anyway.
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Old 04-22-2009, 11:01 PM   #8
Blair Lowe
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So, that probably means any hippie soy eating gals I have a desire with shold be evoided. Bummer.
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Old 04-23-2009, 07:04 AM   #9
Garrett Smith
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Blair,
You don't have to avoid them, just know that they will likely have low sperm counts... :-P
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Old 04-26-2009, 11:15 AM   #10
Tom Rawls
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Garrett--

Perhaps I misunderstand, but Blair for some reason thinks soy consumption makes a woman a less desirable parnter, and you appear to be advising Blair that soy-eating women will have low sperm counts.

Could you explain what you mean by a woman with a low sperm count?
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