Featured Research

from universities, journals, and other organizations

BPA and testosterone levels: First evidence for small changes in men

Date:
August 26, 2010
Source:
The Peninsula College of Medicine and Dentistry
Summary:
Researchers have for the first time identified changes in sex hormones associated with bisphenol A exposure in men, in a large population study. BPA is a chemical commonly used in food and drink containers.

An international group of researchers led by the Peninsula Medical School and the University of Exeter have for the first time identified changes in sex hormones associated with exposure to bisphenol A (BPA) in men, in a large population study.

The study results are published in the latest issue of Environmental Health Perspectives.

Researchers analysed data from the InCHIANTI study, an Italian population sample. The team measured the amount of BPA excreted per day in urine samples. 715 adults aged between 20 and 74 years were studied. The study aimed to measure the daily BPA loads excreted by adults, and to examine statistical associations between the amount of BPA exposure and serum estrogen and testosterone concentrations.

The average BPA daily exposure level in this European study population (over 5 micrograms per day) was slightly higher than recent comparable estimates for the USA population. The study found that higher BPA exposure was statistically associated with endocrine changes in men, specifically small increases in levels of testosterone in the blood.

BPA has a similar molecular structure to estrogen and does cause some disruption of sex hormone signalling in laboratory animals, but this is the first large human study to suggest that it may have similar effects in adults at 'background' exposure levels.

Professor David Melzer, Professor of Epidemiology and Public Health at the Peninsula Medical School (Exeter, UK), commented: "This is the first big study of BPA from a European country and confirms that 'routine' exposures in the population are not negligible. It also shows that higher exposure to BPA is statistically associated with modest changes in levels of testosterone in men. This finding is consistent with the evidence from laboratory experiments. However, this is just the first step in proving that at 'ordinary' exposure levels, BPA might be active in the human body. This new evidence does justify proper human safety studies to clarify the effects of BPA in people."

BPA is a controversial chemical commonly used in food and drink containers. It has previously caused concerns over health risks to babies, as it is present in some baby's bottles. Several nations have moved to ban BPA from the manufacture of baby's bottles and other feeding equipment. The US Food and Drug administration has committed itself to reducing BPA residues in food. BPA has never undergone formal human safety studies: nearly all the safety experiments have been on laboratory mice or rats, and these may be misleading as BPA is metabolised differently in the human body.

The main source of BPA in people is thought to be from residues in food, leaching out of certain types of polycarbonate and resin packaging. The new study therefore used statistical models adjusted for factors including measures of obesity, to exclude misleading associations in people who consume more food.

BPA has also been associated with thyroid hormone disruption, altered pancreatic beta-cell function, cardiovascular disease and obesity.

BPA is used in polycarbonate plastic products such as refillable drinks containers, some plastic eating utensils and many other products in everyday use. It is one of the world's highest production volume chemicals, with over 2.2 million tonnes (6.4 billion pounds) produced annually. It is detectable in the bodies of more than 90% of the population.


Story Source:

The above story is based on materials provided by The Peninsula College of Medicine and Dentistry. Note: Materials may be edited for content and length.


Journal Reference:

  1. Tamara Galloway, Riccardo Cipelli, Jack Guralnick, Luigi Ferrucci, Stefania Bandinelli, Anna Maria Corsi, Cathryn Money, Paul McCormack, David Melzer. Daily Bisphenol A Excretion and Associations with Sex Hormone Concentrations: Results from the InCHIANTI Adult Population Study. Environmental Health Perspectives, 2010; DOI: 10.1289/ehp.1002367

Cite This Page:

The Peninsula College of Medicine and Dentistry. "BPA and testosterone levels: First evidence for small changes in men." ScienceDaily. ScienceDaily, 26 August 2010. <www.sciencedaily.com/releases/2010/08/100825191654.htm>.
The Peninsula College of Medicine and Dentistry. (2010, August 26). BPA and testosterone levels: First evidence for small changes in men. ScienceDaily. Retrieved July 29, 2014 from www.sciencedaily.com/releases/2010/08/100825191654.htm
The Peninsula College of Medicine and Dentistry. "BPA and testosterone levels: First evidence for small changes in men." ScienceDaily. www.sciencedaily.com/releases/2010/08/100825191654.htm (accessed July 29, 2014).

Share This




More Health & Medicine News

Tuesday, July 29, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Deadly Ebola Virus Threatens West Africa

Deadly Ebola Virus Threatens West Africa

AP (July 28, 2014) West African nations and international health organizations are working to contain the largest Ebola outbreak in history. It's one of the deadliest diseases known to man, but the CDC says it's unlikely to spread in the U.S. (July 28) Video provided by AP
Powered by NewsLook.com
$15B Deal on Vets' Health Care Reached

$15B Deal on Vets' Health Care Reached

AP (July 28, 2014) A bipartisan deal to improve veterans health care would authorize at least $15 billion in emergency spending to fix a veterans program scandalized by long patient wait times and falsified records. (July 28) Video provided by AP
Powered by NewsLook.com
Two Americans Contract Ebola in Liberia

Two Americans Contract Ebola in Liberia

Reuters - US Online Video (July 28, 2014) Two American aid workers in Liberia test positive for Ebola while working to combat the deadliest outbreak of the virus ever. Linda So reports. Video provided by Reuters
Powered by NewsLook.com
Traditional African Dishes Teach Healthy Eating

Traditional African Dishes Teach Healthy Eating

AP (July 28, 2014) Classes are being offered nationwide to encourage African Americans to learn about cooking fresh foods based on traditional African cuisine. The program is trying to combat obesity, heart disease and other ailments often linked to diet. (July 28) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins