Navigation Links
Too Much Dairy, Carbs Might Harm Men's Sperm

By Alan Mozes
HealthDay Reporter

FRIDAY, Oct. 26 (HealthDay News) -- Diet can have a notable impact on reproductive health, a group of new studies suggests.

One set of findings: The more carbohydrates or diary a man eats, the poorer the quality of his sperm.

Similarly, two other studies focused on in vitro fertilization (IVF), and found that women who lowered their carb intake while upping their protein consumption stood better chances of becoming pregnant.

While the studies showed an association between diet and fertility, they did not prove any cause-and-effect links.

The research was scheduled for presentation this week at the American Society for Reproductive Medicine annual meeting, in San Diego.

The pair of IVF studies was led by J. B. Russell, of the division of reproductive endocrinology and infertility at Christiana Care Health Systems in Newark, Del. The two sperm studies were led, respectively, by Dr. Jorge Chavarro, an assistant professor of nutrition and epidemiology, and research fellow Myriam Afeiche, both with the Harvard School of Public Health.

"[Recent] studies have found that there appears to be a downward trend in sperm counts throughout the world that spanned the entire 20th century, and more recent studies suggest that it may have continued into the early 21st century," Chavarro said. "While this is still highly controversial, if a downward trend in sperm counts is indeed taking place, the determinants of these decline are not clear at all."

"One of the proposed hypotheses," he said, "is that exposure to environmental factors, particularly environmental estrogens, [namely] 'female' hormones, may be the culprit. In addition, this downward trend has also coincided with a large number of changes in the population, some of which are known to affect sperm counts, most notably obesity."

The Harvard team launched two investigations exploring the impact of nutrition on sperm quality. One focused on dairy intake and the other on carb consumption.

The carb study involved just under 200 "highly physical active" healthy men between the ages of 18 and 22, most of whom were white.

A dietary analysis revealed that carbs accounted for roughly half of all calories consumed among the participants. The team found that carb intake did not appear to have any impact on sperm mobility or shape. However, it did find that the more carbs consumed, the lower the man's overall sperm count.

On the dairy front, the Harvard group found that sperm shape was less likely to be "normal" as men's dairy intake went up. This connection was particularly strong when full-fat dairy products -- such as whole milk, cheese and cream -- were consumed. Neither sperm count nor sperm movement seemed to be affected by this relationship.

Chavarro said that the results of both studies held up even after accounting for a number of possibly influencing factors, such as body weight, smoking history, and alcohol and caffeine consumption habits.

Two other studies focused on women undergoing in vitro fertilization.

In the first instance, 120 women filled out a three-day dietary diary before ever having IVF. The team found that those with a high protein/low carb intake had a better chance of having their fertilized eggs survive to the so-called blastocyst stage of development and becoming pregnant.

A smaller study involved 12 women who had already tried IVF and failed to become pregnant. A similar food diary analysis was conducted before a second round of IVF. The women were counseled to up their protein intake and lower their carb consumption.

The result: Successful blastocyst formation jumped from just 19 percent on the first try at IVF to 45 percent following dietary counseling. What's more, pregnancy rates similarly shot up, from 17 percent to 83 percent.

Lona Sandon, an assistant professor of clinical nutrition at the University of Texas Southwestern Dallas, said the findings "make a lot of sense."

"First of all, you would of course expect that something produced by the body would be affected by the quality of nutrition put into it," Sandon said. "For one thing, we've known for years, from the female perspective, that the quality of nutrition that a woman takes in at the time of conception or even before conception has an influence on that child's health long-term in all sorts of ways. So, it shouldn't be surprising that nutrition would have an impact on men and the quality of their sperm, which is basically made by protein, or on in vitro pregnancy rates."

Because the studies were presented at a medical meeting, the data and conclusions should be viewed as preliminary until published in a peer-reviewed journal.

More information

The U.S. National Institute of Child Health and Human Development has more about infertility.

SOURCES: Jorge Chavarro, M.D., Sc.D., assistant professor, nutrition and epidemiology, Harvard School of Public Health, and assistant professor, medicine, Harvard Medical School, Boston; Lona Sandon, R.D., assistant professor, clinical nutrition, University of Texas Southwestern Dallas; Oct. 20-24, 2012, presentations, American Society for Reproductive Medicine annual meeting, San Diego

Copyright©2012 ScoutNews,LLC.
All rights reserved  

Related medicine news :

1. Pivotal role for proteins -- from helping turn carbs into energy to causing devastating disease
2. New Stool Test Might Aid in Early Detection of Colon Cancer
3. Depo-Provera Birth Control Might Raise Breast Cancer Risk
4. Brain Falters Near End of Life, but Games, Puzzles Might Slow Decline
5. Infection Might Raise Blood Clot Risk for Older Adults: Study
6. Anxiety Might Help People Sniff Out Threats
7. Lung Cancer Screening Might Pay Off, Analysis Shows
8. Mobile Stroke Units Might Trim Time to Treatment
9. Common Plastics Chemical Might Boost Diabetes Risk
10. Media Multitasking Might Have Mental Upside
11. Brain Surgery Might Ease Tough-to-Treat OCD
Post Your Comments:
Related Image:
Too Much Dairy, Carbs Might Harm Men's Sperm
(Date:10/13/2015)... ... 13, 2015 , ... Element Blue ™, a leading ... company, RightSensor™ LLC, an Internet of Things (IoT) hardware supplier that delivers custom ... approach for customers requiring sensor hardware for critical data environments. , RightSensor™, working ...
(Date:10/13/2015)... , ... October 13, 2015 , ... Dr. Poneh Ghasri, ... New Today on September 18, 2015. The research, which was conducted at the Dental ... Sabbah and colleagues, show connections between stress during pregnancy and future dental health in ...
(Date:10/13/2015)... ... October 13, 2015 , ... A child without a healthy mouth is much ... leading remote invisible aligner system, has joined with Global Dental Relief (GDR) ... each aligner treatment plan purchased, SmileCareClub will donate one clinic visit to a child ...
(Date:10/13/2015)... ... October 13, 2015 , ... Altec Products, Inc., the ... of Synergy 2015. The annual WennSoft KEY2ACT user conference will take place from ... unite customers, partners, WennSoft team members and sponsors to facilitate the sharing of ...
(Date:10/13/2015)... Dallas, Texas (PRWEB) , ... October 13, 2015 ... ... network headquartered in McHenry County, Illinois with more than 59,000 emergency department visits ... department information system (EDIS) from T-System, to help improve clinical, operational and financial ...
Breaking Medicine News(10 mins):
(Date:10/13/2015)... 2015  Data Science Automation (DSA), a system integration and ... branch office in the United Kingdom ... Europe . The decision to open the new ... support of customers in the medical device industry throughout the ... Manager. "We have had tremendous success over the last several ...
(Date:10/13/2015)... 13, 2015  Nanomedical Diagnostics, a biotech company ... and diagnostics, announces the completion of a Series ... Serra Ventures. --> ... easy-to-use monitoring and diagnostic platforms that empower individuals ... round will enable the company to commercially release ...
(Date:10/13/2015)... , Oct. 13, 2015 Attracting mid- to large-sized ... key to growing Baltimore into a ... today by the Maryland Technology Enterprise Institute (Mtech) . ... the pieces in place to support innovation hubs and a ... of Mtech Baltimore. "This study is important because we believe ...
Breaking Medicine Technology: