Diet and sperm DNA fragmentation are linked in observational research, but a dietary association does not prove a fertility treatment works. A 2026 case-control study of 300 men found different odds of high DFI across eating patterns; it did not measure subsequent pregnancy or live birth.
Male fertility is influenced by more than a single meal or laboratory result. Ganji and colleagues’ 2026 study at Avicenna Fertility Center in Tehran compared 150 men with DFI above 30% and 150 below 20%, using a food-frequency questionnaire and sperm chromatin dispersion testing.
Dietary patterns and the reported DFI findings
The most plant-pescatarian eating pattern was associated with lower adjusted odds of high DFI (OR 0.39; 95% CI 0.15–0.73). Semi-Western and ultra-processed patterns had higher odds (OR 3.06 and 3.77; 95% CIs 1.32–7.07 and 2.01–7.07), comparing highest with lowest thirds. These are odds ratios, not absolute risks or treatment effects.
What the article says about sperm DNA integrity
DFI concerns the proportion of sperm showing evidence of DNA fragmentation. It complements questions about count, motility and morphology, but does not determine whether an individual embryo will develop normally. The EAU guideline describes associations with reproductive outcomes while noting limits in predicting assisted-reproduction results.
Oxidative stress is one possible explanation for the association. However, this study did not measure oxidative-stress biomarkers, so it cannot show that changing diet prevents DNA damage through that pathway.
Semen analysis, lifestyle and fertility assessment
Normal semen results do not settle every question about fertility. The AUA/ASRM diagnostic guideline notes that individual semen parameters alone do not establish fertility or infertility, and recommends considering both partners. This does not mean that damaged DNA explains every otherwise unexplained case.
An integrated assessment considers reproductive and medical history, semen results and relevant lifestyle factors. DNA-fragmentation testing has selected uses; AUA/ASRM does not recommend it routinely in the initial infertility evaluation. EAU also regards routine reactive-oxygen-species testing as experimental pending stronger validation.
Sperm are not formed overnight. A classic human study by Heller and Clermont estimated spermatogenesis at about 64 days. Such physiological timing does not establish a fixed deadline by which dietary changes must improve an individual’s fertility.
Food choices can be discussed alongside the rest of a fertility assessment. This article does not support replacing medical evaluation with a diet, promising pregnancy after a dietary change, or assuming that supplements reproduce the effects of an eating pattern.
Research sources and limits
Primary study: Ganji et al., Scientific Reports (2026), doi:10.1038/s41598-026-35928-1. Self-reported intake, residual confounding and a single-clinic sample limit interpretation. It was not a randomized diet trial. The guideline and physiology sources are linked beside the relevant statements.
Related reading
- Metabolic health and sperm DNA fragmentation: the homocysteine study
- Antioxidants and male infertility: what is known about live birth
Disclaimer: This content is provided for informational purposes, based on reporting on infertility and various public data. Medical judgments and treatment decisions must always be made in consultation with professional medical personnel. Image: AI-generated (ChatGPT, OpenAI) / Visual reference for illustrative purposes only.