Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Soy likely doesn’t affect fertility, according to research in monkeys

20.10.2004


New research shows that the plant estrogens in soy don’t impair fertility in monkeys. The study was designed to test a theory that high-soy diets can compromise fertility in women.



The results, from Wake Forest University Baptist Medical Center and Emory University School of Medicine, were reported today at the annual meeting of the American Society for Reproductive Medicine in Philadelphia, Pa. "Our results suggest that a high-soy diet probably won’t compromise fertility in women," said Jay Kaplan, Ph.D., lead researcher, from Wake Forest Baptist. "But our results confirmed earlier findings that fertility may be affected by stress levels."

Women in Asian countries where a lot of soy is consumed have dramatically lower rates of breast cancer than women in the United States. One explanation is that plant estrogens, called isoflavones, increase menstrual cycle length or reduce ovarian hormones – both which would reduce lifetime exposure to estrogen. However, these changes in the menstrual cycle could also impair fertility.


In a study of monkeys, which have menstrual cycles similar to those of women, Kaplan and colleagues tested the hypothesis that the estrogen in soy can affect menstrual cycles. "Our study was designed to determine whether a soy supplement containing twice the level of plant estrogen consumed by Asian women would alter any aspect of the menstrual cycle or ovarian function in monkeys," he said.

For one year, half of the monkeys were fed a high-soy diet and half got their protein from animal sources. All monkeys were evaluated during this period for changes in ovarian hormones and menstrual cycles. "Soy treatment did not change any characteristics of the menstrual cycle, including length, amount of bleeding or hormone levels," said Kaplan. "This suggests that any protection that soy may provide against breast cancer does not come from changes in the menstrual cycle."

He said consumption of a high-soy diet probably would not compromise fertility, although further research is warranted to evaluate effects of soy on placenta function and on the fetus. The study did confirm earlier findings by Kaplan – that high levels of stress can affect ovarian function.

The monkeys in the study were housed in groups, where they naturally form a social hierarchy. In previous research, Kaplan found that the stress of being subordinate in the group impairs ovarian function, which means that lower levels of estrogen are produced. In both monkeys and people, reduced levels of estrogen can make menstrual cycles more variable and affect fertility.

In the current study, subordinate monkeys had reductions in ovarian hormones and changes in the menstrual cycle pattern that were observed in the earlier research.

Other researchers involved in the work were Thomas Clarkson, D.V.M., from Wake Forest Baptist, S. L. Berga, M.D., from Emory University School of Medicine, and M. E. Wilson, Ph.D., from the Yerkes National Primate Research Center.

Karen Richardson | EurekAlert!
Further information:
http://www.wfubmc.edu

More articles from Health and Medicine:

nachricht Cholesterol-lowering drugs may fight infectious disease
22.08.2017 | Duke University

nachricht Once invincible superbug squashed by 'superteam' of antibiotics
22.08.2017 | University at Buffalo

All articles from Health and Medicine >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fizzy soda water could be key to clean manufacture of flat wonder material: Graphene

Whether you call it effervescent, fizzy, or sparkling, carbonated water is making a comeback as a beverage. Aside from quenching thirst, researchers at the University of Illinois at Urbana-Champaign have discovered a new use for these "bubbly" concoctions that will have major impact on the manufacturer of the world's thinnest, flattest, and one most useful materials -- graphene.

As graphene's popularity grows as an advanced "wonder" material, the speed and quality at which it can be manufactured will be paramount. With that in mind,...

Im Focus: Exotic quantum states made from light: Physicists create optical “wells” for a super-photon

Physicists at the University of Bonn have managed to create optical hollows and more complex patterns into which the light of a Bose-Einstein condensate flows. The creation of such highly low-loss structures for light is a prerequisite for complex light circuits, such as for quantum information processing for a new generation of computers. The researchers are now presenting their results in the journal Nature Photonics.

Light particles (photons) occur as tiny, indivisible portions. Many thousands of these light portions can be merged to form a single super-photon if they are...

Im Focus: Circular RNA linked to brain function

For the first time, scientists have shown that circular RNA is linked to brain function. When a RNA molecule called Cdr1as was deleted from the genome of mice, the animals had problems filtering out unnecessary information – like patients suffering from neuropsychiatric disorders.

While hundreds of circular RNAs (circRNAs) are abundant in mammalian brains, one big question has remained unanswered: What are they actually good for? In the...

Im Focus: RAVAN CubeSat measures Earth's outgoing energy

An experimental small satellite has successfully collected and delivered data on a key measurement for predicting changes in Earth's climate.

The Radiometer Assessment using Vertically Aligned Nanotubes (RAVAN) CubeSat was launched into low-Earth orbit on Nov. 11, 2016, in order to test new...

Im Focus: Scientists shine new light on the “other high temperature superconductor”

A study led by scientists of the Max Planck Institute for the Structure and Dynamics of Matter (MPSD) at the Center for Free-Electron Laser Science in Hamburg presents evidence of the coexistence of superconductivity and “charge-density-waves” in compounds of the poorly-studied family of bismuthates. This observation opens up new perspectives for a deeper understanding of the phenomenon of high-temperature superconductivity, a topic which is at the core of condensed matter research since more than 30 years. The paper by Nicoletti et al has been published in the PNAS.

Since the beginning of the 20th century, superconductivity had been observed in some metals at temperatures only a few degrees above the absolute zero (minus...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Call for Papers – ICNFT 2018, 5th International Conference on New Forming Technology

16.08.2017 | Event News

Sustainability is the business model of tomorrow

04.08.2017 | Event News

Clash of Realities 2017: Registration now open. International Conference at TH Köln

26.07.2017 | Event News

 
Latest News

What the world's tiniest 'monster truck' reveals

23.08.2017 | Life Sciences

Treating arthritis with algae

23.08.2017 | Life Sciences

Witnessing turbulent motion in the atmosphere of a distant star

23.08.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>