A recent Fuhrman blog confirms once again that Dr. Fuhrman is a source of health information that is generally 3 years ahead of the popular media.
Walnuts May Promote Male Fertility
"Adequate folate, abundant in green vegetables, may also promote fertility by preventing DNA damage in sperm.5 In contrast, higher saturated fat consumption, and cheese specifically, have been linked to lower semen quality.2,6,7"
2. Attaman JA, Toth TL, Furtado J, et al: Dietary fat and semen quality among men attending a fertility clinic. Hum Reprod 2012;27:1466-1474. "In this preliminary cross-sectional study, high intake of saturated fats was negatively related to sperm concentration whereas higher intake of omega-3 fats was positively related to sperm morphology." http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3329193/
6. Afeiche M, Williams PL, Mendiola J, et al: Dairy food intake in relation to semen quality and reproductive hormone levels among physically active young men. Hum Reprod 2013. "We found that intake of full-fat dairy was inversely related to sperm motility and morphology. These associations were driven primarily by intake of cheese and were independent of overall dietary patterns." www.pubmed.com/23670169 or http://www.ncbi.nlm.nih.gov/pubmed/23670169
7. Jensen TK, Heitmann BL, Jensen MB, et al: High dietary intake of saturated fat is associated with reduced semen quality among 701 young Danish men from the general population. Am J Clin Nutr 2013;97:411-418. "BACKGROUND: Saturated fat intake has been associated with both cardiovascular disease and cancer risk, and a newly published study found an association between saturated fat intake and a lower sperm concentration in infertile men. RESULTS: A lower sperm concentration and total sperm count in men with a high intake of saturated fat was found. A significant dose-response association was found, and men in the highest quartile of saturated fat intake had a 38% (95% CI: 0.1%, 61%) lower sperm concentration and a 41% (95% CI: 4%, 64%) lower total sperm count than did men in the lowest quartile. No association between semen quality and intake of other types of fat was found. www.pubmed.com/ 23269819
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