Fatty diets may be associated with reduced semen quality
Men's diets, in particular the amount and type of different fats they eat, could be associated with their semen quality according to the results of a study published online in Europe's leading reproductive medicine journal Human Reproduction today.
The study of 99 men in the USA found an association between a high total fat intake and lower total sperm count and concentration. It also found that men who ate more omega-3 polyunsaturated fats (the type of fat often found in fish and plant oils) had better formed sperm than men who ate less.
However, the researchers warn that this is a small study, and its findings need to be replicated by further research in order to be sure about the role played by fats on men's fertility. Professor Jill Attaman, who was a Clinical and Research Fellow in Reproductive Endocrinology and Infertility at Massachusetts General Hospital and an Instructor in Obstetrics, Gynecology and Reproductive Biology at Harvard Medical School at the time of the research, said: "In the meantime, if men make changes to their diets so as to reduce the amount of saturated fat they eat and increase their omega-3 intake, then this may not only improve their general health, but could improve their reproductive health too. At a global level, adopting these lifestyle modifications may improve general health, as high saturated fat diets are known to be a risk factor for a range of cardiovascular diseases; but, in addition, our research suggests that it could be beneficial for reproductive health worldwide."
A number of previous studies have investigated the link between body mass index (BMI) and semen quality, with mixed results. However, little is known about the potential role of dietary fats and semen quality, and so Prof Attaman and her colleagues set out to investigate it in men attending a fertility clinic.
Between December 2006 and August 2010 they questioned the men about their diet and analysed samples of their semen; they also measured levels of fatty acids in sperm and seminal plasma in 23 of the 99 men taking part.
The men were divided into three groups according to the amount of fats they consumed. Those in the third with the highest fat intake had a 43% lower total sperm count and 38% lower sperm concentration than men in the third with the lowest fat intake. "Total sperm count" is defined as the total number of sperm in the ejaculate, while "sperm concentration" is defined as the concentration of sperm (number per unit volume). The World Health Organisation provides a definition of "normal" total sperm count and concentration as follows: the total number of spermatozoa in the ejaculate should be at least 39 million; the concentration of spermatozoa should be at least 15 million per ml.
The study found that the relationship between dietary fats and semen quality was largely driven by the consumption of saturated fats. Men consuming the most saturated fats had a 35% lower total sperm count than men eating the least, and a 38% lower sperm concentration. "The magnitude of the association is quite dramatic and provides further support for the health efforts to limit consumption of saturated fat given their relation with other health outcomes such as cardiovascular disease," said Prof Attaman.
Men consuming the most omega-3 fats had slightly more sperm (1.9%) that were correctly formed than men in the third that had the lowest omega-3 intake.
Of note: 71% of all the men in the study were overweight or obese, and the health effects of this could also affect semen quality. However, the researchers made allowances for this. "We were able to isolate the independent effects of fat intake from those of obesity using statistical models," said Prof Attaman. "Notably, the frequency of overweight and obesity among men in this study does not differ much from that among men in the general population in the USA (74%)."
The study is subject to a number of limitations that could affect the results; for instance, the use of a food frequency questionnaire might not accurately reflect men's actual diets, and only one semen sample per man was collected. The authors point out that studies like theirs cannot show that dietary fats cause poor semen quality, only that there is an association between the two.
"To our knowledge, this is the largest study to date examining the influence of specific dietary fats on male fertility," they write. But they conclude: "Given the limitations of the current study, in particular the fact that it is a cross-sectional analysis and that it is the first report of a relation between dietary fat and semen quality, it is essential that these findings be reproduced in future work."
Prof Attaman and her colleagues are continuing to investigate how dietary and lifestyle factors influence fertility in men and women as well as the treatment outcomes of couples undergoing fertility treatment.
More information: "Dietary fat and semen quality among men attending a fertility clinic", by Jill A. Attaman et al. Human Reproduction journal. doi:10.1093/humrep/des065
Provided by European Society of Human Reproduction and Embryology
-
Better nutrition makes for better sperm
Oct 18, 2011 |
not rated yet |
0
-
Semen quality depends upon antioxidants
Jun 02, 2009 |
not rated yet |
0
-
Overweight men have poorer sperm count
Jul 04, 2011 |
not rated yet |
0
-
Cola and unhealthy lifestyle lower sperm count
Mar 31, 2010 |
not rated yet |
0
-
Soy foods are associated with lower sperm concentrations
Jul 24, 2008 |
not rated yet |
0
-
Motion perception revisited: High Phi effect challenges established motion perception assumptions
Apr 23, 2013 |
3 / 5 (2) |
2
-
Anything you can do I can do better: Neuromolecular foundations of the superiority illusion (Update)
Apr 02, 2013 |
4.5 / 5 (11) |
5
-
The visual system as economist: Neural resource allocation in visual adaptation
Mar 30, 2013 |
5 / 5 (2) |
9
-
Separate lives: Neuronal and organismal lifespans decoupled
Mar 27, 2013 |
4.9 / 5 (8) |
0
-
Sizing things up: The evolutionary neurobiology of scale invariance
Feb 28, 2013 |
4.8 / 5 (10) |
14
-
Classical and Quantum Mechanics via Lie algebras
Apr 15, 2011
- More from Physics Forums - Independent Research
More news stories
Youth who have their first drink during puberty have higher levels of later drinking
Research shows that the earlier the age at which youth take their first alcoholic drink, the greater the risk of developing alcohol problems. Thus, age at first drink (AFD) is generally considered a powerful predictor of ...
Health
13 hours ago |
not rated yet |
0
British MPs concerned about parliamentary boozing
One quarter of British lawmakers believe there is an "unhealthy" drinking culture in the Houses of Parliament, according to a survey published on Friday.
Health
18 hours ago |
not rated yet |
0
Patient openness to research can depend on race and sex of study personnel
Researchers at the University of Cincinnati (UC) have found that the race and sex of study personnel can influence a patient's decision on whether or not to participate in clinical research.
Health
19 hours ago |
not rated yet |
0
Clinical support for patient self-management is rhetoric rather than reality
The processes to allow people to self-manage their own illness are not being used appropriately by health professionals to the benefit of their patients, new research suggests.
Health
19 hours ago |
not rated yet |
0
Control of heart disease risk factors varies among outpatient practices
Control of heart disease risk factors varies widely among outpatient practices, according to a study presented at the American Heart Association's Quality of Care and Outcomes Research Scientific Sessions 2013.
Health
20 hours ago |
not rated yet |
0
AIDS science at 30: 'Cure' now part of lexicon
Big names in medicine are set to give an upbeat assessment of the war on AIDS on Tuesday, 30 years after French researchers identified the virus that causes the disease.
For combat veterans suffering from post-traumatic stress disorder, 'fear circuitry' in the brain never rests
Chronic trauma can inflict lasting damage to brain regions associated with fear and anxiety. Previous imaging studies of people with post-traumatic stress disorder, or PTSD, have shown that these brain regions can over-or ...
Melon focus headband turns to Kickstarter for rollout plans
(Medical Xpress)—What if the quality of your work depends more on your focus on the piano keys or canvas or laptop than your musical or painting or computing skills? If target users can be convinced, they ...
Temporal processing in the olfactory system
The neural machinery underlying our olfactory sense continues to be an enigma for neuroscience. A recent review in Neuron seeks to expand traditional ideas about how neurons in the olfactory bulb might encode information about ...
Now we know why old scizophrenia medicine works on antibiotics-resistant bacteria
In 2008 researchers from the University of Southern Denmark showed that the drug thioridazine, which has previously been used to treat schizophrenia, is also a powerful weapon against antibiotic-resistant bacteria such as ...
Individuals who drink heavily and smoke may show 'early aging' of the brain
Treatment for alcohol use disorders works best if the patient actively understands and incorporates the interventions provided in the clinic. Multiple factors can influence both the type and degree of neurocognitive abnormalities ...
Mar 15, 2012
Rank: not rated yet