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Tomada, I.; Tomada, N. Mediterranean Diet and Male Fertility. Encyclopedia. Available online: (accessed on 18 June 2024).
Tomada I, Tomada N. Mediterranean Diet and Male Fertility. Encyclopedia. Available at: Accessed June 18, 2024.
Tomada, Inês, Nuno Tomada. "Mediterranean Diet and Male Fertility" Encyclopedia, (accessed June 18, 2024).
Tomada, I., & Tomada, N. (2023, June 26). Mediterranean Diet and Male Fertility. In Encyclopedia.
Tomada, Inês and Nuno Tomada. "Mediterranean Diet and Male Fertility." Encyclopedia. Web. 26 June, 2023.
Mediterranean Diet and Male Fertility

Diet has an impact on male reproductive potential, but few studies have focused on the specific impact of food groups or dietary patterns on fertility. Male reproductive health, as indicated by improved semen parameters and increased chances of conceiving, is associated with the Mediterranean diet, while the Western diet is considered a risk factor for male infertility.

Mediterranean diet male fertility sperm quality parameters nutrition

1. Mediterranean Diet versus Western Dietary Pattern

The MedDiet encourages increased consumption of fruits, vegetables, whole grains, nuts, seafood, and low-fat dairy (Figure 1) [1]. This diet is a synonym of a restricted intake of simple carbohydrates, cholesterol, saturated and trans fats, and a higher intake of fiber, vitamins, minerals, and other non-nutritional components with potent antioxidant and anti-inflammatory properties [1].
Figure 1. Characteristics of Mediterranean and Western diets.
Cutillas-Tolín and col. (2015) [2] analyzed the relationship between the MedDiet and the Western diet with semen quality parameters in 209 young and healthy men (aged 18–23 years). The researchers found that men who adhered more closely to the MedDiet had normal total sperm count and were more likely to have normal body mass index values, be non-smokers, and have a more active lifestyle [2]. In contrast, among those who preferred a daily Western dietary pattern, low sperm concentration was observed, particularly in overweight and obese men [2]. Indeed, foods included in the Western-style diet (Figure 1), such as high-fat dairy, red meats, and processed meat products (sources of saturated fat and trans fatty acids, respectively), have been inversely related to overall sperm parameters and total sperm count [3][4].
Recently, Cao and col. (2022) [5] published a systematic review and meta-analysis that aimed to explore the effects of higher and lower consumption of healthy diets, including the MedDiet, on semen quality. They found that men with greater compliance to healthy diets had the greatest sperm concentration, progressive sperm motility, and total sperm count [5]. However, other parameters, such as sperm morphology, total sperm motility, and semen volume, seemed to be similar compared to men with the lowest ingestion of healthy diets [6].
The regular intake of sugar-sweetened beverages has been associated with weight gain and obesity, which in turn increase insulin resistance and negatively affect semen quality through increased oxidative stress [7]. Lower semen volume, sperm concentration, total sperm count, and total motility have been reported among sugar-sweetened beverage consumers [7]. Since artificially sweetened beverages are not associated with weight gain and obesity itself, this type of beverage has become popular and frequently consumed in the last decades [7]. However, Meldgaard and col. (2022) [5] recently found that semen quality in young men was not significantly affected by the consumption of sugar-sweetened or artificially sweetened beverages. Nonetheless, the percentage of morphologically normal sperm was slightly lower among consumers of artificially sweetened beverages at least 3 days per week [5].
In a systematic review by Falsig and col. (2019) [8], the results from observational studies were found to be consistent with those from randomized controlled trials (RTCs) concerning the adoption of a healthy diet rich in omega-3 fatty acids (from fish and seafood) and improved semen parameters. Positive associations with omega-3 fatty acids were observed in the following parameters: reduced risk of asthenozoospermia; normal morphology; increased total sperm count, concentration, motility, and volume; and reduced sperm DNA fragmentation [8]. Additionally, some findings indicate that the consumption of foods rich in omega-3 fatty acids may also improve fecundity [9].
Fish and seafood are not the only sources of omega-3 fatty acids. Nuts, such as walnuts, hazelnuts, and almonds, are nutrient-dense foods traditionally present in the MedDiet, and are rich in omega-3 fatty acids, as well as vitamins C and E, selenium, and zinc [10]. Interestingly, in the FERTINUTS (Effect of Nut Consumption on Semen Quality and Functionality in Healthy Males) study, Salas-Huetos and col. (2018) [10] found that when young, healthy men were invited to consume a Western diet enriched with 60 g of nuts for 14 weeks, considerable improvements in total sperm count and vitality, as well as total and progressive motility and morphology of sperm were observed compared to a control group. Nut consumption was also associated with a significant reduction in sperm DNA fragmentation, which can justify these positive results in sperm parameters [10].
Over the last several decades, the Western diet has been the culprit for the growing rate of obesity, which has had a significant negative effect on fertility due to its impact on hormonal levels, sperm function, and gamete molecular composition (Figure 2) [11][12][13][14]. Despite the fact that a higher body mass index has been associated with compromised sperm production and quality [15][16], the molecular mechanisms underlying obesity and male infertility are still not totally understood [17]. Increased body fat mass has been related to impaired reproductive potential due to its effect on the molecular and physical structure of sperm [15][18][19]. Obese men are more likely to be infertile due to the larger proportion of DNA fragmentation, abnormal morphology, and low mitochondrial membrane potential, which have been linked to high levels of ROS [18][19]. Regular consumption of a Western diet is directly associated with the high prevalence of obesity and its comorbidities (such as insulin resistance and diabetes) and has also been related to low sperm quality or function [20][21]. For instance, high-energy and high-fat diets (particularly those higher in animal fat and processed foods) have been associated with testicular disruption and, thus, impairments in spermatogenesis [12].
Figure 2. Effects of Western-style diet on semen quality.
The high proportion of adipose tissue is also associated with increased conversion of testosterone to estrogen (mainly through increased aromatase activity), decreased production of testosterone due to the increased secretion of leptin, and decreased gonadotrophin secretion (Figure 2) [22]. However, these conditions can potentially be reversed with diet- and exercise-induced weight loss [14][23]. Interestingly, weight-loss surgeries performed on morbidly obese men, despite inducing an increase in total testosterone and follicle-stimulating hormone levels, do not impact semen quality parameters [24]. Taken together, it seems that diet quality, but not total energy intake, may have a more noticeable impact on spermatogenesis [25].
There are many interesting interventional trials focused on the effect of increasing the intake of certain foods and/or administering specific nutritional supplements on semen quality parameters without other changes in dietary habits or lifestyle. Recently, Montano and col. (2022) [26] evaluated the outcomes of a dietary and exercise intervention on the semen quality of healthy, young, normal-weight men. The men randomly selected for the intervention group were invited to modify their habits in a relatively short time (4 months), whereas men enrolled in the control group received only general recommendations concerning a healthy lifestyle [26]. The main findings of this randomized trial, known as the “Fertilità, Ambiente, alimentazione, STile di vita” (FASt) study, showed that a lifestyle intervention based on MedDiet principles and regular exercise practice led to an increase in sperm concentration, as well as higher total and progressive motility [26]. Additionally, the proportion of spermatozoa with abnormal morphology and the number of round cells were reduced in these men. Overall, the semen quality parameters of men who modified their lifestyle by adopting a healthy diet and exercising regularly improved significantly compared to those who only received generic health advice. The authors concluded that lifestyle interventions could be paramount in healthy young men for protecting and potentially enhancing semen quality [26].

2. Mechanisms of Mediterranean Diet Effects on Semen Parameters

Adherence to the MedDiet pattern is associated with a diminished risk of low sperm concentration and total count, as previously mentioned. Although the biological mechanisms linking diet, sperm function, and fertility are not yet fully understood, potential mechanisms are discussed here.
MedDiet foods are naturally rich in nutrients with anti-inflammatory effects [27]. Chronic low-grade inflammation may affect reproduction through anatomical or functional changes in the male accessory gland and/or through direct negative effects on spermatozoa [27]. The association between adherence to the MedDiet and semen quality may also be mediated by increased intake of omega-3 fatty acids found in fish and fish oils [28], as well as in nuts [10]. Sperm and testicular cells, compared to other cells or tissues, have a higher concentration of long-chain polyunsaturated fatty acids (LC-PUFAs), particularly docosahexaenoic acid (DHA; 22:6 n-3) [8]. DHA is thought to play an important role in the regulation of membrane fluidity and spermatogenesis and is involved in acrosome reaction and sperm–oocyte fusion [8]. Several studies show that DHA levels in spermatozoa from asthenozoospermic and oligozoospermic men are significantly lower compared to normospermic men [8]. Seafood is also characterized by a high content of fat-soluble vitamins (vitamins A, D, E, and K), which play a crucial role in fertilization [9].
The typical foods of the MedDiet have a low content of saturated and trans fatty acids, two components that can trigger or worsen inflammation and thus affect semen quality [29]. The intake of trans fatty acid-rich foods, such as processed and ultra-processed foods, has been associated with disruptions in testosterone levels, testicular function, and sperm cell membrane quality [30]. Low testosterone levels and lower testicular volume have been reported among unhealthy diet consumers [31]. Furthermore, both saturated and monounsaturated fatty acids content in sperm are negatively linked to sperm motility and sperm concentration, while spermatozoa and seminal plasma DHA content could be considered as predictors of cryopreservation success (sperm DHA were associated with sperm motility and viability after freezing/thawing) [31]. Considering this, MedDiet adoption should be considered to improve overall health and male fertility.
Greater adherence to the MedDiet is significantly associated with improved semen quality, higher sperm concentration, total sperm count, and total and progressive sperm motility [32][33][34][35][36][37], as well as lower DNA fragmentation [37]. These benefits of the MedDiet on semen features are believed to be due to the high intake of fruits and vegetables rich in antioxidant vitamins (such as beta-carotene and vitamins A, C, and E), minerals (such as magnesium), and polyphenols [38]. As sperm membranes are highly sensitive to oxidative damage caused by reactive oxygen species (ROS), the benefit of this diet on semen quality may be due to the greater intake of foods naturally rich in antioxidants and carotenoids [38].
Antioxidants found in plant-based foods can play a significant role in influencing semen quality. Indeed, antioxidants are important for reproductive health, as they protect against excessive production of ROS, which can harm sperm DNA integrity, sperm cell plasma membranes, sperm quantity and function, such as motility, and sperm–oocyte fusion [39][40]. Moreover, these substances also help to prevent sperm agglutination by neutralization of hydroxyl, superoxide, and hydrogen peroxide radicals [40]. The MedDiet, which emphasizes a higher plant-food intake rich in antioxidants rather than meat and meat products, can have favorable effects on semen indicators. For instance, carotenoids have been associated with higher sperm motility in young, healthy males [38].
Men who consume a diet high in antioxidants and folate have been found to have better semen quality and less DNA damage in spermatozoa. Dark green leafy vegetables are a good source of folate, which is essential for spermatogenesis, DNA and protein synthesis, and DNA and protein methylation processes. Seminal plasma with low folate concentration is linked to sperm DNA damage, as folate shortage increases DNA fragility due to the misincorporation of uracil instead of thymine. If the removal of the misincorporated uracil fails, it can result in double-strand breaks that cause chromosome instability during normal repair processes. Folate deficiency also reduces the supply of methyl groups, which play an important role in DNA protection against damaging exposures [39]. Higher intakes of folate-rich foods, such as fruits and vegetables, have been linked to decreased DNA fragmentation and enhanced motility [41].
Berries, such as blueberries, strawberries, and raspberries, as well as grapes and red wine, are high in fiber, vitamin C, and antioxidant polyphenols. Resveratrol is a potent polyphenol found in these foods, which are typically included in the MedDiet. Several studies have demonstrated that resveratrol may be beneficial for human male fertility due to its proven antioxidant effects and positive effects on several enzymatic pathways [42]. Although the ideal concentration of daily resveratrol consumption and/or supplementation is still unknown, it is consensual that it has beneficial effects on spermatogenesis and contributes to better sperm parameters [43], particularly in obese men [44].
In recent years, multiple studies have emerged concerning the effects of gut microbiota on general health, specifically on fertility. It is well recognized that diet largely affects gut microbiota composition [44][45][46]. High intake of fat and/or simple sugars, as seen in Western-style diets, are two of the primary causes of intestinal dysbiosis. This condition results in a quantitative and qualitative imbalance of intestinal microbiota that disrupts the intestinal barrier [44]. The increased permeability of the intestinal barrier promotes chronic systemic inflammation, which further contributes to obesity and several metabolic diseases [46]. According to recent animal [47][48] and human [49] studies, a high-fat diet may also lower sperm quality by altering the gut microbiota, while modulating the gut microbiota may increase sperm quality.


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