Navigation Links
Soyfoods Do Not Impact Sperm Count
Date:7/24/2008

WASHINGTON, July 24 /PRNewswire-USNewswire/ -- Headlines claiming "soy products lower sperm count" do not tell the whole story. The small scale, preliminary study that Dr. Jorge Chavarro, published online in Human Reproduction, is based on recollected intake of soyfoods and not on specific diets containing soyfoods. "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, Department of Pathology. Dr. Chavarro found that "soyfood and soy isoflavone intakes were unrelated to total sperm count, ejaculate volume, sperm motility, or sperm morphology" which are the important measures of sperm quality and male fertility. The study also did not determine directly what other foods, medications, supplements, existing medical conditions, sexual activities or environmental factors may have directly affected the drop in sperm count. The study also classified high intakes of soyfoods as less than 3 ounces of a beverage per day -- about one 8 ounce glass of a beverage every three days. This is not considered a high intake of any food under most circumstances.

Dr. Larry Ross, Past President of the American Urology Association noted that "Like most epidemiological reports, this study is retrospective and is therefore inherently subject to a variety of biases. The total study population was small (100 subjects) and little is known or reported about other dietary, stress factors, medications, or lifestyle issues that might also affect sperm counts in these men. It is well known that of all semen parameters, variation in count (#s of sperm/cc seminal fluid) is highly variable from day to day and seasonally in all men. This is most clear when one considers the "range" of "normal" sperm count accepted in our field (20-200,000 million.)"

Chavarro found that the men with the highest soyfood intake produced more ejaculate fluid volume with equivalent amounts of sperm count as those with lower intakes, neither the volume or the number of sperm was significantly different, however this larger volume lead to the lower sperm concentrations (millions per millimeter) in the higher intake individuals. This watering-down effect of sperm concentration should not be mistakenly associated with a decrease in fertility.

Obesity may be the explanation for the negative findings of this study. Dr. Chavarro found high soyfood intakes are associated with lower sperm concentration but "the association was more pronounced among overweight and obese men than among lean men." Men with high levels of body fat are likely to produce more estrogen than their slimmer counterparts.

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. Upon hearing of Chavarro's findings, Dr. Stephen Barnes, a pharmacologist at the University of Alabama at Birmingham, noted, "This study is the first to find this correlation. The research on soy in men has not found a negative impact on male hormones but rather has suggested a preventive effect in prostate cancer."

Learn the facts about healthy soyfoods. Studies have indicated soyfoods may lower cholesterol, decrease risk of heart disease, and may protect against certain cancers. For more information, visit http://www.soyfoods.org.

Contact: Nancy Chapman, RD, MPH, Executive Director, (202) 659-3520


'/>"/>
SOURCE Soyfoods Association of North America
Copyright©2008 PR Newswire.
All rights reserved

Related medicine technology :

1. Hopkins Report: Focusing on Family Planning Lessens HIV Impact
2. Dendreon Completes Target Enrollment of 500 Patients in Phase 3 IMPACT Study of Provenge(R) For Advanced Prostate Cancer
3. VIA Pharmaceuticals Enrolls First Patient in Phase 2 Clinical Trial to Measure Impact of VIA-2291 to Reduce Vascular Inflammation
4. Gastric Banding Reverses Impact of Type 2 Diabetes
5. ImpactRx Tracks Decline in Zetia and Vytorin Prescribing
6. Mayo Clinic Proceedings Contributors Discuss Impact of Donor Organ Allocation System
7. Navigenics(TM) Genome Analysis Used In Research Trial on the Impact of Providing Genetic Risk Assessments
8. Karmanos Researchers Study the Impact of Galectin-3 on Breast Cancer Disparity in Caucasian and Asian Women
9. DSMB Supports Continuation of Anthera Phase II Impacts Trial for the Prevention of Acute Chest Syndrome in Patients With Sickle Cell Disease
10. Schering-Plough Announces Imperfect Contraceptive Use Impacts Womens Emotional Well-Being
11. Community Breast Center Experience Shows Real-World Application of Breast-Specific Gamma Imaging Has Significant Impact on Clinical Care
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/23/2016)... June 23, 2016 Research and Markets ... Market - Forecast to 2022" report to their offering. ... method for the patients with kidney failure, it replaces the ... from the patient,s blood and thus the treatment helps to ... chloride in balance. Increasing number of ESRD ...
(Date:6/23/2016)... Ill. , June 23, 2016  In a startling report ... are failing their residents by lacking a comprehensive, proven plan to ... a definitive ranking of how states are tackling the worst ... to only four states – Kentucky , ... Vermont . Of the 28 failing states, three ...
(Date:6/23/2016)... Capricor Therapeutics, Inc. ... company focused on the discovery, development and commercialization ... in its ongoing randomized HOPE-Duchenne clinical trial (Halt ... its 24-patient target. Capricor expects the trial to ... 2016, and to report top line data from ...
Breaking Medicine Technology:
(Date:6/27/2016)... ... June 27, 2016 , ... ... announced its strategic partnership with Connance, a healthcare industry leader providing predictive ... proven, proprietary technology combine to provide health systems, hospitals and ambulatory surgical ...
(Date:6/26/2016)... ... June 26, 2016 , ... Pixel Film Studios Released ... , "Film editors can give their videos a whole new perspective by using the ... CEO of Pixel Film Studios. , ProSlice Levels contains over 30 Different presets ...
(Date:6/25/2016)... ... June 25, 2016 , ... Austin residents seeking Mohs ... College of Mohs Surgery and to Dr. Russell Peckham for medical and surgical dermatology. ... treatment for skin cancer. The selective fellowship in Mohs Micrographic Surgery completed by Dr. ...
(Date:6/25/2016)... City, Oklahoma (PRWEB) , ... June 25, 2016 ... ... helping both athletes and non-athletes recover from injury. Recently, he has implemented orthobiologic ... the Oklahoma City area —Johnson is one of the first doctors to perform ...
(Date:6/24/2016)... (PRWEB) , ... June 24, 2016 , ... June 19, ... the dangers associated with chronic pain and the benefits of holistic treatments, Serenity ... who are suffering with Sickle Cell Disease. , Sickle Cell Disease (SCD) is a ...
Breaking Medicine News(10 mins):