Insights & Discussion
Consuming 75g of whole-shelled walnuts daily improves sperm vitality, motility, and morphology in young men adhering to a Western-style diet.
A random-led, two-group dietary intervention trial with single-blind outcome assessment was administered to 117 healthy men ranging from 21 to 35 years, all eating a Western-style diet. The main aim was to examine any changes in conventional semen parameters and sperm aneuploidy after 12 weeks, with changes in blood serum and sperm fatty acid profiles, sex hormones, and serum folate as secondary endpoints. The half of participants tasked with eating walnuts displayed improvements in sperm vitality, motility, and morphology, while no changes were seen in the control group that continued their normal diet and avoided tree nuts.
The outcomes displayed that the group which had taken walnuts showed improvement in terms of their sperm vitality, motility, and morphology. There were also enhancements in serum fatty acid profiles, including increase in omega-6, and omega-3 amongst the walnut consuming group. No such improvements were observed in the control group. Furthermore, sperm aneuploidy was shown to have a reverse correlation with sperm alpha-linolenic acid, particularly in sex chromosome nullisomy.
Discover Related Insights
Incorporating tree nuts into a Western-style diet subtly modifies specific DNA methylation regions within sperm, thereby showing parts of the sperm epigenome can respond to dietary changes.
2020 Andrology Sperm DNA methylation changes after short‐term nut supplementation in healthy men consuming a Western‐style diet Salas‐Huetos A, James ER, Salas‐Salvadó J, Bulló M, Aston KI, Carrell DT, et al.
Randomised Controlled Trial Hazelnut Sperm Quality Walnut
The study methodology involved a post hoc analysis with a subset of the participants (healthy, non-smoking, and young) from the FERTINUTS 14-week randomized-controlled, parallel trial. The selected participants were from the pool of individuals who completed the entire dietary intervention trial. These individuals were split into two groups: the nut group, which consumed 60 grams per day of mixed nuts for 14 weeks, and the control group, who maintained their regular Western-style diet devoid of nuts.
Investigation of the trial's results revealed no significant changes in overall methylation between the two groups. However, for the nut group, there were 36 genomic regions distinctly showing differential methylation between the beginning and end of the trial with a marked increase in methylation. No such changes were identified in the control group. Analysis also involved examining if nut consumption led to changes in the epigenetic age of cells, but no significant differences were discovered.
Consuming walnuts can enhance sperm motility and morphology, potentially improving fertility in males with infertility issues.
2019 Current Developments in Nutrition Randomized Clinical Trial: Effect of Walnuts on Semen Parameters and Male Fertility (P18-042-19) Robbins W, Kim H, Houman J, Lee GW
Randomised Controlled Trial Male Fertility Sperm Quality Walnut
This study was a randomized clinical trial split into two comparison groups, all of which received typical care for male infertility. Besides the usual care, one group added 42 gm/d walnuts to their diet, while the other group included a daily nutritional supplement recommended for male reproductive health. The participants, a total of 75 in number and with varied demographic profiles, were enrolled at an infertility clinic located in a large metropolitan medical center. The study ran for 3 months, with research measures including semen analysis and blood samples at baseline and after 3 months, while dietary recall and fertility reports were obtained at various stages.
In terms of results, the group consuming walnuts showed a marked increase in sperm motility and concentration after 3 months. Simultaneously, both groups—those consuming walnuts and the group consuming the nutritional supplement—demonstrated an improvement in sperm morphology. Further, preliminary data observed over one year suggested a higher frequency of pregnancy in the group consuming walnuts, although it was not statistically significant.