What your fertility reveals about your overall health

Most people think of fertility as a single yes or no question about having a baby. On the Mark Hyman podcast, Dr. Natalie Crawford, a fertility doctor, reframes it entirely. Your reproductive cycle and sperm are vital signs, an early window into your cellular and metabolic health. Treated that way, infertility becomes less a verdict and more a symptom worth investigating long before anything goes seriously wrong.

Your reproductive cycle is a vital sign

The current system is reactive. You are told to try for a year, and only after you fail does anyone test you. Crawford argues that makes no sense when infertility is rising. Reproductive signals show up before disease and give you a chance to change course. The same logic applies to men, since sperm and testosterone are made together and regenerate every 90 days, so a single change can quickly shift both.

The menstrual cycle, briefly

Each month a group of eggs leaves the ovary, and one matures inside a follicle driven by follicle stimulating hormone. Rising estrogen triggers a surge of luteinizing hormone, the egg is released, and the leftover follicle becomes the corpus luteum that makes progesterone. If no pregnancy occurs, progesterone falls and a period begins. This is a finely tuned conversation between brain and ovary.

Ovulation is not a light switch

Many women track cycles with apps that simply count days and guess ovulation, which is only right about 20 percent of the time. A short luteal phase, under 11 days, is an early red flag that can point to thyroid problems, high prolactin, chronic inflammation, or insulin resistance. Tracking real ovulation through cervical mucus, body temperature, or urinary hormones reveals these signals years before a problem becomes obvious.

Inflammation is the common thread

Crawford describes inflammation as static on the radio between brain and ovary. It also harms egg mitochondria directly, and since mitochondria pass only from mother to child, that damage carries forward. Some inflammation is necessary, even for ovulation, which is why she warns against NSAIDs around ovulation, as they can block the egg from releasing. The goal is not perfection but lowering your overall inflammatory burden so your body stays resilient.

Five levers you control

Crawford focuses on five buckets you can influence every day.

• Sleep: This is the most neglected. Less sleep means fewer eggs retrieved in IVF for women and lower testosterone and sperm for men. Aim for at least 7 to 7.5 hours.
• Stress: Chronic stress raises cortisol and glucose, which drives insulin resistance. Use your physiology by walking or doing a few squats to burn off that glucose instead of reaching for food or alcohol.
• Muscle: Muscle uses glucose without insulin, making it one of the best defenses against insulin resistance. Many young women do only cardio or yoga and skip resistance training.
• Food: Anchor your diet in fiber, fruits, vegetables, healthy fats, and quality protein, and cut ultra processed foods and refined sugar. A short whole food elimination trial can reveal hidden sensitivities like gluten or dairy.
• Toxins: Remove plastic from the kitchen, avoid hot food in plastic, and choose fragrance free over unscented products, since endocrine disruptors mimic hormones.

Fertility, aging, and longevity

The same factors that protect fertility protect long term health. Chronic inflammation and insulin resistance can deplete the egg vault and push women into early menopause, which raises the risk of heart disease, cancer, stroke, and dementia. Crawford advocates checking ovarian reserve with an AMH test and fasting insulin earlier in life, not to cause alarm but to give women data and choices. For young women, reproductive health is the first glimpse into cellular aging.

Conclusion

You do not need 50 hacks. Listen to your body's early signals, get real data instead of accepting that everything is normal, and work the levers you control. As Crawford and Hyman agree, the habits that build healthy fertility are the same ones that build a long, healthy life, so the best time to pay attention is now.