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 【再也不能“吃豆腐”啦！】大豆制品影响男性精子数量 - Soy is making 'G -a-y' |
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The Fifth Season
[博客]
头衔: 海归中将
声望: 博导
加入时间: 2008/09/12
文章: 4241
海归分: 567427
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作者：The Fifth Season 在 海归酒吧 发贴, 来自【海归网】 http://www.haiguinet.com
据美国多家媒体报道，美国哈佛大学公共卫生学院的一项最新研究再一次明确，如果每天都食用大豆制品，会让男性的精子数量明显下降。
这项研究由哈佛大学公共卫生学院的乔治·查瓦罗博士完成。从2000年到2006年，研究人员跟踪调查了99名男性。研究结果令人吃惊：每天都吃大豆制品的男性，其每毫升精液中只有4100万个精子，明显低于少吃大豆制品的男性。据了解，每毫升精液中精子数量少于2000万个就属于精子浓度过低，容易不育。此外，这一联系在肥胖男性身上体现得更为明显。
查瓦罗认为，大豆制品对男性生殖系统，尤其是精子的生成有不利影响。大豆及其制品中含有丰富的异黄酮类植物雌激素，若摄入过多，自然会影响到男性体内雄性激素的水平，从而导致一系列不良后果。
我国也曾有男科专家提出，吃大豆制品过多会影响男性精子数量。近5年来，南京市妇幼保健院男科医生潘连军一直在关注这一问题。他还发现，常吃大豆制品的男性，发生勃起功能障碍的几率是不常吃者的3.46倍。
贴心提醒：适量吃大豆制品，是避免男性出现健康隐患的最好方法。所谓“适量”，是指一周吃3次以下，每次100克左右。
Harvard study: Soy sinks sperm count
'It could have some deleterious effect on the reproductive system'
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Posted: July 24, 2008
8:30 pm Eastern
© 2009 WorldNetDaily
A new Harvard study suggests men who eat higher amounts of soy-ba<x>sed foods become "feminized" – confirming a series of reports documented by longtime WND columnist Jim Rutz and drawing outraged protests from the soy food industry.
According to a report from Reuters, the study was done by Jorge Chavarro of the Harvard School of Public Health in Boston, whose work appeared in the journal Human Reproduction.
It reportedly is the largest study of humans to look at the relationship between semen quality and a plant form of the female sex hormone estrogen known as phytoestrogen, which is plentiful in soy-rich foods.
"What we found was men that consume the highest amounts of soy foods in this study had a lower sperm concentration compared to those who did not consume soy foods," Chavarro told Reuters.
"It was a relatively large difference," he said.
The researcher said animal studies already have l<x>inked eating the plant-derived estrogens called isoflavones with infertility, but that's not evident in humans yet.
The researchers looked at 99 men who went to a fertility clinic between 2000 and 2006, and their intake of soy-ba<x>sed foods, including tofu, tempeh, soy sausages, bacon or burgers, soy milk, cheese and yogurt.
Chavarro reported men in the highest intake category had 41 million sperm-per-milliliter fewer than men who ate no soy foods, prompting him to suggest soy has a "deleterious effect" on the reproductive system.
According to WebMD, most of the men who visited the Massachusetts General Hospital Fertility Center still had sperm concentrations within normal ranges, but Chavarro said the circumstances could create an impact in a man who already had a low count.
Rutz's original reports, starting in 2006 with one titled 'Soy is making kids 'g-a-y,'' cited a number of studies and described soy as a "slow poison."
"Now, I'm a health-food guy, a fanatic who seldom allows anything into his kitchen unless it's organic. I state my bias here just so you'll know I'm not anti-health food," he wrote.
"The dangerous food I'm speaking of is soy. Soybean products are feminizing, and they're all over the place. You can hardly escape them anymore.
"I have nothing against an occasional soy snack. Soy is nutritious and contains lots of good things. Unfortunately, when you eat or drink a lot of soy stuff, you're also getting substantial quantities of estrogens," he continued.
"Estrogens are female hormones. If you're a woman, you're flooding your system with a substance it can't handle in surplus. If you're a man, you're suppressing your masculinity and stimulating your 'female side,' physically and mentally," he wrote. "In fetal development, the default is being female. All humans (even in old age) tend toward femininity. The main thing that keeps men from diverging into the female pattern is testosterone, and testosterone is suppressed by an excess of estrogen.
"If you're a grownup, you're already developed, and you're able to fight off some of the damaging effects of soy. Babies aren't so fortunate. Research is now showing that when you feed your baby soy formula, you're giving him or her the equivalent of five birth control pills a day. A baby's endocrine system just can't cope with that kind of massive assault, so some damage is inevitable. At the extreme, the damage can be fatal."
He concluded that soy is "feminizing, and commonly leads to … homosexuality," prompting hundreds, if not thousands of e-mails of outrage.
Many who wrote reflected the same concerns included in a PRNewswire statement from the Soyfoods Association of North America.
The organization called Chavarro's work a "small scale, preliminary study."
"This study is confounded by many issues, thus I feel the results should be viewed with a great deal of caution," warned Dr. Tammy Hedlund, a researcher in prostate cancer prevention from the University of Colorado Health Sciences Center in the Soyfoods Association statement.
"Chavarro's study conflicts with the large body of U.S. government and National Institute of Health-sponsored human and primate research, in which controlled amounts of isoflavones from soy were fed and no effect on quantity, quality or motility of sperm were observed," the trade group said.
Read all of Rutz's columns on soy for the whole story:
Soy is making kids 'g-a-y'
The trouble with soy – part 2
The trouble with soy – part 3
The trouble with soy – part 4
The trouble with soy – part 5
The trouble with soy – part 6
https://www.wnd.com/index.php?fa=PAGE.view&pageId=70504
作者：The Fifth Season 在 海归酒吧 发贴, 来自【海归网】 http://www.haiguinet.com
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 【再也不能“吃豆腐”啦！】大豆制品影响男性精子数量 - Soy is making 'G -a-y' -- The Fifth Season - (5589 Byte) 2009-6-15 周一, 13:30 (2024 reads)
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