Walnuts to Help Your Semen (nuts for your… nuts?)
The daily addition of 75 g of whole-shelled walnuts to a typical Western-style diet appears to have positive effects on the vitality, morphology, and motility of sperm in healthy men, according to the findings of a randomized, parallel, 2-group, dietary intervention trial.
The prevalence of sex chromosome disomy and sperm missing a sex chromosome were significantly lower in the walnut group after 12 weeks of supplementation (P = .002 and .01, respectively). Sperm α-linolenic acid levels were inversely correlated with the proportion of sperm missing a sex chromosome (Spearman correlation coefficient, −0.41; P = .002)
No differences were observed between the baseline characteristics of the control and walnut groups, excluding lower follicle-stimulating hormone levels in the walnut group (P = .04). The limitations of the study included the collection of blood samples only during daytime, preventing evaluation of the effects of diurnal variations in sex hormone levels.
“While there is no doubt that many men with abnormal morphology, vitality, or motility would not be helped by this intervention because of the clearly multifactorial basis of male infertility, nevertheless, if a subset of infertile men can be helped, this would be a positive advance,” she concluded.
This study was funded through a grant from the California Walnut Commission. Dr. Lamb has received grant support from the National Institutes of Health and from the William and Ella Owens Medical Research Foundation.
Biol Reprod. Published online August 15, 2012. Full text
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