MANGOBOSS.com |
What Is Normal Height for a Man? Read the Full Story |
| Jamie Foxx-5'9" TomCruise 5'7" Daniel Craig 6' |
| Soy Reduces Sperm Count-New 2008 Study Related Links Fatty Diet Linked to Prostate Cancer Blood Pressure-What It Means Foods That Reduce Blood Pressure Low Folate Harms Sperm Penis Shaving Bumps-Home Remedies Yoga That Improves Erectile Performance Better Tasting Sperm Get Lean Diet for Men July 23, 2008 A new study published today in by the Human Reproduction Journal has once again linked consumption of soy with reduced sperm count. The study, found that eating as little as half a cup of soy a day can cut your perm count in half. Soy foods contain substances called "isoflavones" which are believed to cause sperm death. The normal concentration of sperm for fertile men is 120 million sperm per milliliter. Men who ate the highest concentrations of soy in the study were found to have sperm concentrations of only 41 million. By comparison, men with sperm concentrations of 20 million or less are considered infertile. The study, which was conducted by researchers affiliated with the Harvard School of Public Health and Massachusetts General Hospital and Brigham and Women's Hospital, is likely to continue to fuel the raging debate in scientific circles over the effect of soy on male fertility. Previous studies which established the adverse link between soy consumption and sperm count were attacked by soy growers who pointed out that in Asian societies men eat far more soy in their daily diets can have no problems with fertility. Soy is growing in popularity in American, European and other Western diets, and can be found in a wide range of products including meatless burgers (soy burgers), tofu products and is used widely in Chinese and Asian cooking. Want Access to More Articles Like This One?-Register -It's Free and Easy. Our Members Only Area Gets First Look at Articles Source: Hum. Reprod. Advance Access published online on July 23, 2008 Human Reproduction, doi:10.1093/humrep/den243 © The Author 2008. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. Soy food and isoflavone intake in relation to semen quality parameters among men from an infertility clinic Jorge E. Chavarro1,2,7, Thomas L. Toth3, Sonita M. Sadio4 and Russ Hauser3,5,6 1 Department of Nutrition, Harvard School of Public Health, 665 Huntington Ave., Boston, MA, USA 2 Channing Laboratory, Department of Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA 02115, USA 3 Vincent Memorial Obstetrics and Gynecology Service, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA 4 Department of Urology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA 5 Department of Environmental Health, Harvard School of Public Health, Boston, MA, USA 6 Department of Epidemiology, Harvard School of Public Health, Boston, MA, USA STUDYBACKGROUND: 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. |
