Most fertility advice comes down to a handful of practical changes: reaching a healthy weight, eating well, tracking your fertile window, and timing intercourse. These steps won’t guarantee pregnancy, but they meaningfully improve your odds each cycle. Here’s what the evidence supports.
Know Your Fertile Window
You can only conceive during a roughly six-day window each cycle: the five days before ovulation and the day of ovulation itself. For the best chance of getting pregnant, have sex every day or every other day during this window. You don’t need to have sex constantly throughout the month, but hitting those key days matters more than overall frequency.
One of the simplest ways to identify this window is by tracking your cervical mucus. Throughout most of your cycle, cervical mucus is thick or pasty. But in the days just before ovulation, it becomes clear, slippery, and stretchy, often compared to raw egg whites. This texture helps sperm travel through the cervix efficiently. You’ll typically notice this fertile-quality mucus for about three to four days. In a 28-day cycle, that usually falls around days 10 through 14. When you see it, that’s your signal.
Ovulation predictor kits, which detect a hormone surge in your urine, offer another way to pinpoint timing. Basal body temperature tracking can confirm ovulation after the fact but is less useful for predicting it in real time. Combining mucus observation with a predictor kit gives you the clearest picture of when your fertile window opens and closes.
Reach a Healthy Weight
Body weight has a direct effect on ovulation. The optimal BMI range for conception is 18.5 to 24.9. Outside that range, fertility drops in both directions.
Carrying excess weight disrupts ovulatory and menstrual function, lowers natural fertility rates, and reduces the success of fertility treatments. Obesity increases the risk of infertility alongside conditions like type 2 diabetes, high blood pressure, and hormonal imbalances. Even modest weight loss (5 to 10 percent of body weight) can restore regular ovulation in many women who have stopped ovulating due to excess weight. And if pregnancy does occur, obesity raises the risk of gestational diabetes, high blood pressure during pregnancy, and cesarean delivery, with risks climbing as weight increases.
Being underweight (BMI below 18.5) carries its own problems. Too little body fat can suppress the hormonal signals that trigger ovulation, leading to irregular or absent periods. If your cycle has become irregular alongside significant weight loss or very low body fat, gaining even a small amount of weight may be enough to restart regular cycles.
Shift Toward a Mediterranean-Style Diet
What you eat influences ovulation and egg quality. A Mediterranean-style eating pattern, built around vegetables, fruits, whole grains, legumes, nuts, and olive oil with limited red meat and dairy, is one of the most studied dietary approaches for fertility. Research has linked higher adherence to this pattern with better outcomes in both natural conception and IVF, including improved egg quality and higher pregnancy rates.
You don’t need to overhaul your diet overnight. Practical shifts make a difference: swap butter for olive oil, add a serving of legumes a few times a week, increase your vegetable intake at dinner, and choose fish over red meat more often. These changes also reduce inflammation and improve insulin sensitivity, both of which support regular ovulation.
Trans fats (found in some processed and fried foods) and high-sugar diets have been linked to ovulatory problems. Cutting back on sugary drinks and heavily processed snacks is one of the simplest dietary changes you can make while trying to conceive.
Start Folic Acid Before Conception
The CDC recommends that all women capable of becoming pregnant take 400 micrograms of folic acid daily. This is primarily to prevent neural tube defects in early pregnancy, which develop before most women even know they’re pregnant. Starting folic acid at least one month before conception gives your body time to build adequate levels, though many experts recommend beginning even earlier.
Folic acid is available in most prenatal vitamins and as a standalone supplement. Folate-rich foods like dark leafy greens, fortified cereals, and citrus fruits contribute too, but a supplement ensures you consistently hit the recommended amount. If you have a history of neural tube defects in a previous pregnancy, your doctor may recommend a higher dose.
Address Lifestyle Factors
Smoking damages eggs, accelerates the loss of your egg supply, and makes the uterine lining less receptive to implantation. Quitting is one of the most impactful things you can do for fertility. The effects of smoking on egg quality begin to reverse after you stop, though the timeline varies.
Alcohol consumption during the preconception period has been associated with reduced fertility in some studies. There’s no established “safe” amount while trying to conceive, so cutting back or eliminating alcohol is a reasonable step. The evidence on caffeine is less conclusive. Current research hasn’t definitively shown that moderate caffeine intake harms female fertility, but many experts suggest limiting it as a precaution while trying to conceive. One to two cups of coffee a day is generally considered a reasonable upper limit.
Chronic stress, sleep deprivation, and extreme exercise can all interfere with the hormonal rhythms that drive ovulation. You don’t need to eliminate stress entirely (that’s unrealistic), but consistent sleep of seven to nine hours and moderate rather than extreme physical activity support regular cycles. Very intense endurance training, particularly when combined with low calorie intake, can suppress ovulation.
Your Partner’s Health Matters Too
Fertility isn’t only about one partner. Male obesity is associated with lower sperm counts, reduced sperm motility, increased DNA damage in sperm, and hormonal shifts that suppress testosterone production. Excess body fat converts testosterone into estrogen, which feeds back to the brain and reduces sperm production. If your partner is carrying significant extra weight, his weight loss can improve your chances of conceiving together.
The same lifestyle recommendations apply: a balanced diet, regular exercise, limited alcohol, no smoking, and avoiding excessive heat exposure to the testicles (prolonged hot tub use, laptops on the lap). Sperm take about 70 to 90 days to mature, so improvements in lifestyle take two to three months to show up in sperm quality.
When to Get a Fertility Evaluation
The timeline for seeking help depends on your age. If you’re under 35 and have been trying for 12 months without success, it’s time for an evaluation. If you’re 35 or older, that window shortens to 6 months. For women over 40, earlier evaluation and treatment may be appropriate given the faster decline in egg quality and quantity at that age.
Certain conditions warrant evaluation right away, regardless of how long you’ve been trying:
- Irregular periods, including cycles shorter than 25 days, skipped periods, or bleeding between periods
- Known or suspected endometriosis or uterine abnormalities
- Known or suspected male factor issues, such as prior semen analysis concerns
- Previous exposure to chemotherapy or radiation, which can reduce your egg reserve
- Sexual dysfunction that prevents regular intercourse
A fertility evaluation typically involves blood tests to check hormone levels and ovarian reserve, imaging of the uterus and fallopian tubes, and a semen analysis for your partner. These tests help identify whether there’s a specific, treatable cause or whether the next step involves assisted reproduction. About one-third of infertility cases trace to female factors, one-third to male factors, and the remaining third to a combination or unexplained causes, so evaluating both partners from the start saves time.