Not All Evidence Is Equal: How to Think About Fertility Nutrition (And What to Trust)

Episode SummaryA lot of fertility advice sounds confident and certain, but the underlying evidence is often more nuanced. In this episode, Alex breaks down how to think critically about fertility nutrition research, why studies sometimes conflict, and how clinicians make practical decisions when certainty is limited.Rather than chasing perfect answers, this episode explains how to interpret evidence in the real world and focus on what is most likely to matter. What You’ll LearnWhy fertility nutrition evidence is rarely black and whiteCommon reasons studies appear to conflictThe challenges of studying nutrition in humansWhy one study rarely tells the full storyFour practical filters to assess research claimsThe difference between semen parameter outcomes and fertility outcomesWhy foundations usually matter more than hype Key TakeawaysEvidence-based practice is about making good decisions under uncertaintyMixed findings do not automatically mean research is uselessPopulation, intervention, outcome, and consistency all matter when judging evidenceImprovements in biomarkers do not always translate to pregnancy or live birth outcomesDiet quality, sleep, alcohol, body composition, and overall health remain core priorities The Four Filters DiscussedPopulation — who was actually studied, and does it apply to you?Intervention — what was tested, at what dose, and for how long?Outcome — did it improve semen parameters or real fertility outcomes?Consistency — is it a one-off finding or repeated across studies? Why This MattersMen trying to conceive are often targeted with bold claims around supplements, diets, and quick fixes. Understanding how evidence works helps you avoid overreacting to headlines, wasting money, or missing the bigger picture.Good decisions are usually built on patterns of evidence, not isolated claims. What’s NextNext episode: Zinc for Male Fertility — where the evidence is stronger, where it is weaker, and how to think about supplementation in practice. DisclaimerThis podcast is for general education only and does not replace personalised medical, nutrition, or fertility advice. Please speak with your healthcare team about your individual situation.Links: www.axisdietetics.com