Fertility is influenced by a surprisingly wide range of everyday factors, from what you eat and how you sleep to chemicals in your kitchen. The good news is that many of the most impactful changes are things you can start today. Both partners’ habits matter: about half of infertility cases involve a male factor, so this isn’t just about the person trying to conceive.
Diet Has a Measurable Impact
A Mediterranean-style eating pattern is one of the most studied dietary approaches for fertility. It emphasizes fruits, vegetables, whole grains, olive oil, fish, nuts, and legumes while limiting red meat and processed foods. In one study, women with the highest adherence to this pattern had a 50% clinical pregnancy rate during fertility treatment compared to 29% among those with the lowest adherence. Across multiple studies, strong adherence was associated with roughly 1.4 to 2.6 times higher odds of pregnancy or live birth.
The reasons aren’t mysterious. This style of eating delivers antioxidants, omega-3 fatty acids, fiber, folate, and B vitamins, all of which reduce inflammation, improve insulin sensitivity, and protect eggs and sperm from oxidative damage. Olive oil and fish have been specifically linked to better sperm quality, while fruits, vegetables, and whole grains support egg maturation. Nuts and legumes appear to improve embryo development.
You don’t need to overhaul your diet overnight. Swapping refined grains for whole grains, cooking with olive oil instead of butter, eating fish twice a week, and adding more colorful produce are practical starting points.
Weight and Ovulation
Body weight has a direct, dose-dependent effect on fertility. Women with a BMI of 32 or higher have 2.7 times the risk of anovulatory infertility, meaning the ovaries stop releasing eggs regularly. Even among women who are ovulating, each single-point increase in BMI reduces the chance of spontaneous conception by about 5%. Being significantly underweight can also disrupt ovulation by suppressing reproductive hormones.
The goal isn’t a specific number on the scale. Even modest weight loss of 5 to 10% in women with elevated BMI can restore regular ovulation and meaningfully shorten time to pregnancy.
Exercise: More Isn’t Always Better
Moderate physical activity supports fertility, but intense exercise can work against it. In one large study, women doing just two hours per week of vigorous exercise were 16% less likely to conceive than sedentary women. At three to four hours weekly, that gap widened to 27%, and at five or more hours it reached 32%. Among runners averaging about 20 miles per week, 16% of cycles were anovulatory (no egg released) and 42% showed a shortened or insufficient luteal phase, the window after ovulation when an embryo would implant.
For women actively trying to conceive, the sweet spot appears to be regular moderate activity like brisk walking, swimming, or cycling at a conversational pace. If you’re already a serious athlete, this doesn’t mean you have to stop entirely, but dialing back intensity is worth considering if conception is taking longer than expected.
Supplements That Matter
Folic acid is the single most important preconception supplement. The CDC recommends 400 micrograms daily, ideally starting at least one month before you try to conceive. It prevents neural tube defects in early development, often before you even know you’re pregnant.
For women with polycystic ovary syndrome (PCOS), a combination of two forms of inositol has shown striking results. A specific 3.6:1 ratio of myo-inositol to D-chiro-inositol has been shown to regularize menstrual cycles, improve insulin resistance, and boost egg quality. In one clinical trial comparing this ratio to a different formulation, pregnancy rates were 65.5% versus 25.9%, and live birth rates were 55.2% versus 14.8%. Inositol is available over the counter, though the ratio matters.
For Male Partners
A systematic review of 29 studies found that antioxidant supplements consistently improved sperm count, motility, and live birth rates. The most beneficial ingredients included coenzyme Q10, zinc, selenium, vitamins C and E, folic acid, and lycopene. CoQ10 at 200 to 300 milligrams daily showed particular promise for sperm motility. Selenium combined with N-acetyl cysteine also improved sperm parameters across multiple trials. Since sperm take roughly three months to develop, supplementation needs time to show results.
Sleep and Hormonal Timing
Your body’s internal clock directly controls the hormonal cascade that triggers ovulation. Melatonin, the hormone your brain produces in darkness, helps regulate the surge of luteinizing hormone that causes an egg to release. Specific clock genes involved in this process depend on consistent sleep-wake cycles to function properly.
Disrupted sleep patterns, whether from shift work, late-night screen exposure, or irregular schedules, can suppress melatonin and throw off these signals. Research has linked this disruption to abnormal secretion of reproductive hormones, and it may be one of the underlying mechanisms behind PCOS. Keeping a consistent sleep schedule of seven to nine hours in a dark room is one of the simplest and most overlooked fertility strategies.
Caffeine and Alcohol Limits
You don’t have to give up coffee entirely. Staying under 200 milligrams of caffeine per day, roughly one to two small cups of coffee, does not appear to affect your ability to conceive. Above that threshold, the evidence becomes less reassuring.
Alcohol is a different story. Heavy drinking is linked to ovulation problems, and there is no established “safe” amount when you’re trying to get pregnant. Stopping alcohol entirely is the most cautious approach, particularly since early pregnancy often goes undetected for several weeks.
Everyday Chemicals Worth Avoiding
Bisphenol A (BPA), found in plastic food containers, can linings, thermal receipt paper, and many consumer products, acts as an endocrine disruptor that affects both egg and sperm quality. In women, BPA exposure has been associated with reduced follicle counts, fewer mature eggs, lower estradiol levels, decreased fertilization rates, and higher implantation failure. In men, it can reduce sperm production, increase oxidative damage in the testes, and impair sperm function at concentrations commonly found in the body.
Practical steps include switching to glass or stainless steel food storage, avoiding heating plastic containers, choosing BPA-free canned goods, and declining paper receipts when possible. Phthalates, found in fragranced personal care products and soft plastics, are another class of endocrine disruptors worth minimizing. Choosing “fragrance-free” products and reducing plastic food contact are simple ways to lower your exposure.
When to Seek Help
If you’re under 35 and have been having regular unprotected sex for 12 months without conceiving, a fertility evaluation is warranted. If you’re 35 or older, that timeline shortens to 6 months. These thresholds, set by the American Society for Reproductive Medicine, exist because egg quality and ovarian reserve decline with age, and earlier intervention improves outcomes. If you have known risk factors like irregular periods, a history of pelvic infections, or a partner with a known sperm issue, there’s no reason to wait the full timeline before getting evaluated.