Dietary Influences on Male Fertility Outcomes

Diet exerts a multifaceted impact on male reproductive health through modulation of hormonal profiles, sperm development and seminal antioxidant capacity. Macronutrient balance, particularly the relative proportions of protein, fats and carbohydrates, shapes spermatogenic efficiency and testicular morphology, while micronutrients and bioactive compounds such as omega-3 fatty acids, zinc, selenium and polyphenols support sperm membrane integrity and DNA stability. Conversely, dietary patterns rich in ultra-processed foods, saturated fats and refined carbohydrates are linked to impaired semen parameters, elevated oxidative stress and altered endocrine signalling. Emerging evidence further implicates glycaemic load and metabolic regulation in determining fecundability, with dietary glycaemic index influencing insulin sensitivity and reactive oxygen species generation. Together, these findings underscore the importance of tailored preconception nutrition for men, highlighting practical interventions—from nut supplementation to reduction of industrially processed ingredients—to optimise sperm function, enhance fertility outcomes and inform public health guidance on male reproductive care.

Research from Nature Portfolio

Animal studies employing the Nutritional Geometry framework have demonstrated that precise macronutrient ratios exert trait-specific effects on male reproductive parameters. In controlled trials using C57BL/6J mice, diets enriched in specific proportions of fat improved sperm motility and antioxidant defences without increasing adiposity, whereas variations in protein and carbohydrate content differentially influenced testicular architecture and sperm morphology. These investigations reveal that total calorie intake alone does not predict reproductive performance; instead, the interactive balance of proteins, carbohydrates and fats dictates key aspects of sperm function and supports the development of targeted dietary guidelines for male preconception health.

Dietary Influences on Male Fertility Outcomes publication trend

The graph below shows the total number of articles in dietary influences on male fertility outcomes across all publications each year (not limited to Nature Index journals).

Technical terms

Macronutrient balance: The proportional distribution of proteins, fats and carbohydrates within the diet that influences metabolic and reproductive physiology.

Sperm motility: The capacity of spermatozoa to swim effectively, a critical determinant of fertilisation potential.

Ultra-processed foods (UPF): Industrial formulations predominantly composed of refined ingredients, additives and minimal intact nutrients, often linked to adverse health outcomes.

Glycaemic index and load: Measures of the quality and quantity of carbohydrate intake, reflecting their impact on postprandial blood glucose and insulin response.

Nutritional Geometry: An analytical framework that examines how complex interactions among dietary macronutrients influence physiological traits.

References

1. Male reproductive traits are differentially affected by dietary macronutrient balance but unrelated to adiposity. Nature Communications (2023).
2. Ultra-processed food consumption and semen quality parameters in the Led-Fertyl study. Human Reproduction Open (2024).
3. Nut Consumption and Fertility: a Systematic Review and Meta-Analysis. Advances in Nutrition (2023).
4. Associations of periconception dietary glycemic index and load with fertility in women and men: a study among couples in the general population. BMC Medicine (2024).
5. Diet and Male Fertility: The Impact of Nutrients and Antioxidants on Sperm Energetic Metabolism. International Journal of Molecular Sciences (2022).