Page of excerpts & links to Science Journal Studies & Reports by Doctors regards: i) Reduced Fertility Associated with Eating Saturated Fats & Animal Hormones (Meat, Dairy, Chicken Eggs); ii) Higher Fertility Associated with Increased Consumption of Plant Foods; iii) the Feminization of Males by Consuming Animal Hormones.
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Regards Infertility in Women:
Dr Michael Greger MD’s clip “Meat Hormones & Female Infertility” is at https://www.youtube.com/watch?v=-_B88TcG3Jk – Excerpts: “pregnant women, in particular, may want to stay away from all meat… meat is so packed with sex steroid hormones that when pregnant women eat meat, it may affect the development of their sons’ genital organs while still in the womb – such that when they grow up, they have decreased fertility… we know that all meat has these hormones, and they looked only at the fertility of the next generation. So, in effect, this study showed eating meat may lead to fewer grandchildren…
the famous Harvard Nurses study, which followed 18,000 women – trying to get pregnant – for eight years, and measured what they ate. They found that meat intake was indeed associated with infertility. Adding just a single serving of meat per day was associated with a 30% greater risk of anovulatory infertility – meaning the meat consumption appeared to interfere with ovulation. And this increased risk was due mostly to the intake of poultry.
To break it down: eat a single serving of any meat, and you increase your infertility risk 30%. Red meat increases infertility risk 40%. But just a single serving of chicken – half a chicken breast a day – and women increase their infertility risk more than 50% – worse than bacon and hot dogs!
Now, while animal protein was associated with increased risk of infertility, consuming protein from vegetable sources appeared to have the opposite effect – protecting, improving fertility…
In summary, they concluded that replacing animal sources of protein – particularly chicken – with vegetable sources of protein – like beans – may reduce the risk of infertility because of anovulation, or failure to ovulate…”
The text transcript at https://nutritionfacts.org/video/meat-hormones-female-infertility/
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Regards Infertility in Men:
2017 report from ABC News Australia “Sperm concentrations in Western men have declined by more than 50 per cent over the past 40 years, according to a major new study…” from article at http://www.abc.net.au/news/2017-07-26/sperm-concentrations-in-western-men-declined-over-40yrs-study/8743020
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Dr Michael Greger MD “The Role of Diet in Declining Sperm Counts” – A large study of 26,000+ men found a large decline. Quotes: “In a previous video I profiled first-of-its-kind Harvard study suggesting that a small increase in saturated fat intake was associated with a substantially lower sperm count… In a study of men aged 22 through 80, older men who ate diets containing lots of antioxidants and micronutrients, for example vitamin C had the genetic integrity of sperm from much younger men… The higher the saturated fat intake the lower the sperm count, up to a 65% reduction in total sperm count… So more fruits and vegetables and perhaps less meat and dairy, which is where most saturated fat is found…” The 4 minute video clip is at https://www.youtube.com/watch?v=R57ynFaQdWk The transcript text is at https://nutritionfacts.org/video/the-role-of-diet-in-declining-sperm-counts/
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A 2009 report in the journal of the American Society for Reproductive Medicine concluded: “Frequent intake of lipophilic foods like meat products or milk may negatively affect semen quality in humans, whereas some fruits or vegetables may maintain or improve semen quality.”
Reference: “Food intake and its relationship with semen quality: a case-control study”, Fertility and Sterility, March 2009, Volume 91, Issue 3, Pages 812–818; at http://www.fertstert.org/article/S0015-0282(08)00014-9/abstract and http://www.fertstert.org/article/S0015-0282(08)00014-9/pdf
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From a 2012 report in the journal of the American Society for Reproductive Medicine: “Our evidence also suggests that successful pregnancy and implantation outcomes are decreased in patients reporting a more frequent intake of meat. This finding is consistent with poor semen quality associated with a higher intake of products that may incorporate xenobiotics, mainly xenoestrogens or certain anabolic steroids…
The use of these compounds in the food industry results in an increased total level of xenoestrogens and sex steroids in processed foods, such as meat or milk, whose intake contributes significantly to daily exposures. Xenoestrogens are highly lipophilic substances that can accumulate in fat-rich foods, such as meat, and may be suspected as partially responsible for the decline in semen quality.
In a recent study by Mendiola and colleagues (40), an association with poor semen quality was observed in foods with processed meat available to consumers (sausages and others). In this study, the control group had a significantly higher intake of skimmed milk and a lower intake of dairy products, and consequently, a possibly lower intake of products containing lipophilic substances such as xenoestrogens.
Other food items were associated with an increased ICSI [intracytoplasmic sperm injection] success. Intake of vegetables lead to a higher implantation chance, and as discussed, this is consistent with a higher intake of antioxidants and micronutrients, which would have a positive influence on sperm quality. In summary, our study demonstrated that semen quality and ICSI outcomes may be influenced by food intake and social habits…”
Reference: “Food intake and social habits in male patients and its relationship to intracytoplasmic sperm injection outcomes”, Fertility and Sterility, January 2012, Volume 97, Issue 1, Pages 53–59; at http://www.fertstert.org/article/S0015-0282(11)02677-X/abstract and http://fertility.com.br/wp-content/uploads/2015/01/12_rev_03.pdf
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Dr Michael Greger’s clip “Dairy Estrogen and Male Fertility” re: “Sex steroid hormones in meat, eggs, and dairy may help explain the link between saturated fat intake and declining sperm counts” is at https://www.youtube.com/watch?v=M33fV0IE9zQ The text transcript is at https://nutritionfacts.org/video/dairy-estrogen-and-male-fertility/
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“Hormones in Milk can be Dangerous” is an article in the Harvard University Gazette. Excerpts: “The link between cancer and dietary hormones – estrogen in particular – has been a source of great concern among scientists… The potential for risk is large. Natural estrogens are up to 100,000 times more potent than their environmental counterparts, such as the estrogen-like compounds in pesticides. “Among the routes of human exposure to estrogens, we are mostly concerned about cow’s milk, which contains considerable amounts of female sex hormones,” Ganmaa told her audience. Dairy, she added, accounts for 60 percent to 80 percent of estrogens consumed…”
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A 2012 report in the American Journal of Clinical Nutrition found that “men in the highest quartile of saturated fat intake had a 38%… lower sperm concentration and a 41%… lower total sperm count than did men in the lowest quartile… Conclusions: Our findings are of potentially great public interest, because changes in diet over the past decades may be part of the explanation for the recently reported high frequency of subnormal human sperm counts. A reduction in saturated fat intake may be beneficial for both general and reproductive health.”
Reference: “High dietary intake of saturated fat is associated with reduced semen quality among 701 young Danish men from the general population”, American Journal of Clinical Nutrition, December 2012; at http://ajcn.nutrition.org/content/early/2012/12/23/ajcn.112.042432
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Regards “Top Food Sources of Saturated Fat in the U.S.” the Harvard School of Public Health states “Pizza and cheese are the biggest food sources of saturated fat in the U.S. diet, and other dairy products and meat products are also major contributors” from https://www.hsph.harvard.edu/nutritionsource/top-food-sources-of-saturated-fat-in-the-us/
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Studies on “Male Fertility and Diet” – from science journals – are covered by Dr Greger MD in this clip at https://www.youtube.com/watch?v=UOFw_6C-rHg The text transcript is at https://nutritionfacts.org/video/male-fertility-and-diet/
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This 2012 study in the Human Reproduction journal also links saturated fat with lower “sperm count and concentration”. Excerpts: “Higher total fat intake was negatively related to total sperm count and concentration. Men in the highest third of total fat intake had 43%… lower total sperm count and 38%… lower sperm concentration than men in the lowest third… This association was driven by intake of saturated fats…”
Reference: “Dietary fat and semen quality among men attending a fertility clinic”, Human Reproduction, 2012 May; 27(5): 1466–1474; at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3329193/
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Further notes on that 2012 report in Human Reproduction: “Our findings support the suggestion that a diet rich in fruits, vegetables, chicken, fish and whole grains may be an inexpensive and safe way to improve at least one measure of semen quality.”
More specifically “Two dietary patterns were identified by factor analysis. The ‘Western’ pattern was characterized by high intake of red and processed meat, refined grains, pizza, snacks, high-energy drinks and sweets. The ‘Prudent’ pattern was characterized by high intake of fish, chicken, fruit, vegetables, legumes and whole grains. The Prudent pattern was positively associated with percent progressively motile sperm in multivariate models (P-trend = 0.04). Men in the highest quartile of the Prudent diet had 11.3% (95% CI 1.3, 21.3) higher % progressively motile sperm compared with men in the lowest quartile…”
Reference: “Dietary patterns and semen quality in young men”, Human Reproduction, 2012 Oct; 27(10): 2899–2907; at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3442634/
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Dr Greger MD’s youtube clip “Chicken Consumption & the Feminization of Male Genitalia” is at https://www.youtube.com/watch?v=juOmk-MVR8o Summary: “Eating chicken during pregnancy may affect the size and development of one’s son’s penis due to phthalate contamination of the meat.”
Excerpts: “a study published last year showing that the phthalates found in chicken were significantly associated with less masculine behavior in boys… The chicken phthalates have also been associated with increased odds of Caesarean section, diminished child intelligence (particularly in boys), attention deficit and hyperactivity disorder (ADHD) symptoms, later in life, abdominal obesity, altered thyroid function, damaged sperm, and, as we learned this summer, a lower sperm count…
In one analysis, while total dairy consumption was significantly associated with one of the phthalate chemicals, it was the eggs and the poultry consumption, in particular, that was a significant predictor of levels of MEHP, as well as total phthalates… In addition to a smaller penis, MEHP appears to increase the odds of boys later growing breasts, 25-fold, and then decreased testosterone later in life… if there is one thing pregnant women may want to avoid during pregnancy to protect their sons’ normal development, it would be to avoid poultry.”
Text transcript is at https://nutritionfacts.org/video/chicken-consumption-and-the-feminization-of-male-genitalia/
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Dairy consumption is associated with altering hormones, feminizing males and altering the sexual maturation of children?
The Pediatrics International journal reported: “After the intake of cow milk, serum estrone (E1) and progesterone concentrations significantly increased, and serum luteinizing hormone, follicle-stimulating hormone and testosterone significantly decreased in men. Urine concentrations of E1, estradiol, estriol and pregnanediol significantly increased in all adults and children. In four out of five women, ovulation occurred during the milk intake, and the timing of ovulation was similar among the three menstrual cycles.”
Their conclusion: “The present data on men and children indicate that estrogens in milk were absorbed, and gonadotropin secretion was suppressed, followed by a decrease in testosterone secretion. Sexual maturation of prepubertal children could be affected by the ordinary intake of cow milk.”
Reference: “Exposure to exogenous estrogen through intake of commercial milk produced from pregnant cows”, Pediatrics International, 2010 Feb;52(1):33-8; at
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A 2001 report in the Medical Hypotheses science journal explores: “Is Milk Responsible for Male Reproductive Disorders?“ From the abstract: “The role of environmental compounds with estrogenic activity in the development of male reproductive disorders has been a source of great concern… The major sources of animal-derived estrogens in the human diet are milk and dairy products, which account for 60-70% of the estrogens consumed. Humans consume milk obtained from heifers in the latter half of pregnancy, when the estrogen levels in cows are markedly elevated. The milk that we now consume may be quite unlike that consumed 100 years ago…”
Reference: “Is milk responsible for male reproductive disorders?”, Medical Hypotheses, 2001 Oct;57(4):510-4; at https://www.ncbi.nlm.nih.gov/pubmed/11601881
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Dr Greger MD’s youtube clip “Estrogen in Meat, Dairy, and Eggs” is at https://www.youtube.com/watch?v=h6q8E2-Egdo Summary: “The sex steroids found naturally in animal products likely exceed the hormonal impacts of endocrine-disrupting chemical pollutants.” The text transcript is at https://nutritionfacts.org/video/estrogen-in-meat-dairy-and-eggs/
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A report in a 2013 issue of Human Reproduction explores the question “Is increased consumption of dairy foods associated with lower semen quality?” In answer, on the results of their study: “We found that intake of full-fat dairy was inversely related to sperm motility and morphology.” That means higher dairy intake was associated with lower sperm quality; an inverse correlation.
“These associations were driven primarily by intake of cheese and were independent of overall dietary patterns.”
They state further: “Total dairy food intake was inversely related to sperm morphology… This association was mostly driven by intake of full-fat dairy foods… Full-fat dairy intake was also associated with significantly lower percent progressively motile sperm… Further research is needed to prove a causal link between a high consumption of full-fat dairy foods and detrimental effects on semen quality…”
Reference: “Dairy food intake in relation to semen quality and reproductive hormone levels among physically active young men”, Human Reproduction, 2013 Aug;28(8):2265-75; at https://www.ncbi.nlm.nih.gov/pubmed/23670169
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Dr Greger’s report on “Soy Hormones & Male Infertility” states “The study did find that soy decreased sperm concentration, but did not significantly affect the sperm count itself. How can you have the same number of sperm, but a lower concentration? Because of a larger ejaculate volume. Soy appears to stimulate the prostate gland to produce a larger load of ejaculate fluid, but the actual number of sperm remains the same.” The video clip is at https://www.youtube.com/watch?v=7ogcNcSYZi8 with transcript at https://nutritionfacts.org/video/soy-hormones-male-infertility/
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Regards Male Hormones & Soy a study published in the ‘Fertility & Sterility’ science journal concluded: “The intervention data indicate that [soy] isoflavones do NOT exert feminizing effects on men at intake levels equal to and even considerably higher than are typical for Asian males”
Other notes from the report: “findings from a recently published metaanalysis and subsequently published studies show that neither isoflavone supplements nor isoflavone-rich soy affect total or free testosterone (T) levels.
Similarly, there is essentially NO evidence from the nine identified clinical studies that isoflavone exposure affects circulating estrogen levels in men.
Clinical evidence also indicates that [soy] isoflavones have NO effect on sperm or semen parameters, although only three intervention studies were identified and none were longer than 3 months in duration.
Finally, findings from animal studies… are NOT applicable to men, because of differences in isoflavone metabolism between rodents and humans and the excessively high amount of isoflavones to which the animals were exposed…”
(capitalised emphasis added)
Reference: “Soybean isoflavone exposure does not have feminizing effects on men: a critical examination of the clinical evidence”, Fertility and Sterility, 2010 May 1;93(7):2095-104; at https://www.ncbi.nlm.nih.gov/pubmed/20378106
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A clip on youtube is titled “Soy Vs Beer: Which Promotes Estrogen More?” at https://www.youtube.com/watch?v=cR9Zu3bYPCA
Some excerpts – In reply to the question “what foods are best to balance or enhance male hormonal levels?” Dr Michael Greger answers:
“It will be a plant-based diet, as I talked about before. Avoiding beer actually. It’s interesting the most potent phytoestrogen in the world is not in soy – it’s in beer… That’s why female hop-pickers start menstruating as soon as they start touching hops.” And that’s because of this powerful estrogenic effects of “hopein,” which is the phytoestrogen found in the bittering agent in beer… So the reason that you see hop extracts in so-called breast enhancement supplements is because of that phytoestrogenic effect, whereas soy phytoestrogens attach preferentially to beta receptors, unlike your own estrogens — your own endogenous estrogen. And so actually have a breast cancer reducing effect through the same protective effect in terms of hot flashes.
And so alcohol itself can decrease testosterone levels, but beer in particular. So I’d encourage people, if they’re worried about testosterone, they shouldn’t be chugging a 6-pack.”
The full text transcript is at
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Regards Soy Consumption & Male Hormones this 2010 report in the science journal ‘Fertility & Sterility’ concluded: “The results of this meta-analysis suggest that neither soy foods nor isoflavone supplements alter measures of bioavailable T[estosterone] concentrations in men.”
Reference: “Clinical studies show no effects of soy protein or isoflavones on reproductive hormones in men: results of a meta-analysis”, Fertility & Sterility, 2010, Aug;94(3): 997-1007; at https://www.ncbi.nlm.nih.gov/pubmed/19524224
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An article by the Physicians Committee for Responsible Medicine titled “Diet, Fertility, and Sperm Count: 6 Ways to Improve Your Fertility” states “Most notably, a diet heavy in meat and dairy is shown to decrease the quality and quantity of sperm, as well as increase infertility risk among women. But research shows that healthful lifestyles may positively affect conception…” The full article is at https://www.pcrm.org/health/reports/diet-fertility-and-sperm-count
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Debunking the Misleading Media Reports that Claim Vegetarian Men are less Fertile.
A 2014 article in the UK’s Telegraph newspaper stated “Vegetarians have much lower sperm counts… Although a diet that is rich in fruit and vegetables can protect against many illnesses and can prolong life, it appears that it may also harm fertility…” Those words are from Sarah Knapton, the paper’s science editor, who was reporting on studies “presented at the American Society of Reproductive Medicine’s annual meeting in Hawaii”.
The following quotes are from an article that refute the Telegraph and other media’s reports of lower fertility in vegetarians. The article is titled “How Student Project on Vegetarianism and Sperm Went Viral“. Excerpts: “The media hoopla is surrounding a study whose main finding could be summed up as “more research is needed,” an irony not lost on its lead author, Dr. Eliza Orzylowska.
“It’s a very preliminary study and not clinically significant, so to get this much press surprised me,” Orzylowska said in a telephone interview.
In fact, she said, scientifically proven evidence that vegetarians enjoy longer, healthier lives is far more significant… “The health benefits of a vegetarian diet outweigh the finding of the study, and we cannot deny that,” she said late Wednesday…”
The study “used a small sample group of 26 vegetarians, five vegans, and 443 non-vegetarians. Clinic patients were entered into the study if, when they dropped off semen for analysis, they checked off an optional box on the clinic’s consent form that showed their diet was vegan, vegetarian, or non-vegetarian, Orzylowska said.
She could not say whether it was significant that so many more non-vegetarians than vegetarians had sought treatment for infertility, noting that the study did not measure how long participants had adhered to their diets. She also expressed disappointment that so few vegetarians had been part of the sample group.
“It’s a preliminary study,” she said. “With the sample size, we did not have as many vegetarians as we would have liked.”
Orzylowska said the media might have headlined with the sperm count, but the decrease in sperm was not sufficient to leave a man infertile.
“Although the headlines read about the decreased sperm count, it’s not clinically significant. It’s just an observation that we made,” she said. “But since it is not at an infertile level, it is hard to say that you should do anything based on this finding.”…
Orzylowska’s research is not connected with either of the Adventist Health Studies, both landmark, peer-reviewed analyses that found that Seventh-day Adventist vegetarians live seven to 10 years longer than the average American…”
The full article is at http://www.adventistreview.org/church-news/how-student-project-on-vegetarianism-and-sperm-went-viral
Other examinations or rebuttals of the media reports on the “study” include:
– “Vegan Diets, Sperm Concentrations and Fertility: Why There is No Need to Worry” by Ginny Messina, RD (Registered Dietitian) at http://www.theveganrd.com/2014/10/vegan-diets-sperm-concentrations-and-fertility-why-there-is-no-need-to-worry/
– An article titled “Does vegetarianism lower sperm count? An update” by John Hopton at at http://www.redorbit.com/news/health/1113407349/does-vegetarianism-lower-sperm-count-an-update-080415/#eIheFx2DPt52k0Mj.99
Another poor piece of journalism on this topic is by Rachel Moss (“Lifestyle Writer at HuffPost UK”) in her article titled “Vegetarians And Vegans Have Lower Sperm Counts Than Meat Eaters, Research Finds” at the Huffington Post website. The above contents of this page refute, debunk & rebut the claims she makes.
Another very poor report of this topic is titled “Uh-oh: Study Finds Vegetarians and Vegans Have Lower Sperm Counts” by Dave Asprey, founder of the “Bulletproof Diet”. That diet is described on wikipedia as “a fad diet developed and marketed by Asprey that recommends eating foods high in fat, moderate in protein, and low in carbohydrates… Dietitians point out there is no scientific basis for these claims, and that any sense of alertness from Bulletproof Coffee is “just a caffeine buzz”…”
For rebuttals of Asprey’s claims see the reports elsewhere on this page. For debunkings of the deeply flawed foundations of his ‘Bulletproof Diet’ see these pages for scientific reports on:
– the Great Health Benefits of High-Carb Diets and Grave Dangers of Low-Carb Diets
– the Paleo Diet Pseudo Science Problems Debunked & Exposed
– how Eating Meat Raises the Risks of Cancer, Heart Disease, Diabetes, Early Death
– amongst others on this site including the Great Damage to Environment Caused by Meat & Dairy Consumption as well as the Disease Risks from Eating Eggs and the Raised Disease Risks of Dairy Consumption
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More to come!!!
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This set of articles were compiled for
Pages on this Site:
Quotes from news reports & science journals on how the Western omnivore diet with meat and dairy products accelerates climate-change through: i) increasing our carbon footprint of greenhouse gases; ii) deforesting & destroying wilderness that absorbs carbon and protects biodiversity; iii) creating massive pollution; and iv) wasting resources like grains, water, fuels and agricultural lands.
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Excerpts & links to medical studies, articles & reports on the links between meat consumption and increased incidences of cancer, heart disease, diabetes and early mortality (a shorter lifespan); also to reports on how cancers are increasing in young people.
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Quotes & links to articles in science, medical & health journals that report great benefits vegetarians and vegans generally have including longer lives with less of the chronic degenerative diseases like cancer, cardiovascular heart disease, diabetes, osteoporosis and obesity as well as lower blood pressure, hypertension and blood cholesterol levels.
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Excerpts & links to articles in news media science journals about the current ‘Sixth Mass Extinction’ known also as the ‘Holocene Extinction’ or ‘Anthropocene Extinction’ as it is largely caused by human activities.
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This page contains quotes & links for studies & articles in science journals, news media & by medical doctors; on the association of drinking milk to higher rates of osteoporosis, cancer, heart disease and other illnesses.
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This page features quotes & links to articles in news media and science journals about the rise of microbes that are resistant to antibiotics; posing a grave threat to all of us; from 50% to 80% of antibiotics are (mis-)used in animal agriculture industries.
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This page features quotes & links to reports that expose how the animal agriculture industries (meat, dairy, poultry) influence government, politics, the education schooling system and news media in order to promote their interests.
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Excerpts from articles about the marine ecosystem collapse that is happening now in oceans, seas & rivers due to over-fishing and the toxic pollution in waterways from land-based animal agriculture meat-farming; worsening climate change; threatening the entire food chain.
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Articles from science journals & news reports that dispute the health claims made regards eating fish; some even find higher rates of heart disease and cancer among seafood consumers.
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A collection of quotes & links for articles by doctors, dietitians & nutrition experts who refute & rebut the negative claims made regards “the soy food debate”
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For Archives of Related Memes see:
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