Fertility at advanced maternal age: A functional medicine approach with Dr. Cindy Geyer

People are waiting longer to have children for many reasons, ranging from expanded education opportunities to later formation of committed partnerships. They may also feel a greater responsibility and desire to be able to support children both financially and emotionally. At the same time, many women worry about their ability to conceive if they wait, and questions about fertility at advanced maternal age often arrive long before anyone is ready to say them out loud. Fortunately, functional and lifestyle medicine approaches can help support fertility and a healthy pregnancy.

In our functional medicine clinic, we commonly see a combination of hormonal shifts, metabolic changes, nutrient depletion, and stress load shaping fertility in the late 30s and 40s. The goal is not to create fear around age. It is to support the body's internal environment so fertility is supported as comprehensively as possible.

RELATED: The ultimate preconception guide: What to do when you’re ready to get pregnant

Fertility does change with age, largely because egg quality shifts over time, but age is only one part of the picture. From a functional medicine perspective, the internal environment that eggs develop in, including mitochondrial health, inflammation, blood sugar balance, thyroid function, sleep, stress, and nutrient status, also plays a meaningful role. Many of these factors respond to nutrition and lifestyle, especially in the 3 to 6 months before conception, and they are best addressed alongside your OB-GYN or reproductive endocrinologist.

Key takeaways

• Advanced maternal age is a statistical category, not a verdict. Many women over 35 have healthy pregnancies and healthy babies, and chronological age is not the same as biological age.

• Egg quality may matter more than egg quantity between 35 and 45, and egg quality is shaped by the environment around the egg, including blood flow, inflammation, and stress signaling.

• A functional medicine approach often looks beyond a standard fertility panel to thyroid markers, fasting insulin, nutrient status, gut health, and sleep.

• Food, sleep, movement, and stress support are the foundation, and targeted nutrients can help fill gaps. Research on supplements for egg quality is promising in places and still emerging overall.

• Both partners matter. Male age is associated with gradual changes in sperm quality, so preconception support works best as a shared project.

What is considered advanced maternal age (AMA)?

The term "advanced maternal age" (AMA) refers to pregnancy at 35 years or older. It is used to raise awareness of a higher statistical likelihood of chromosomal differences, miscarriage, gestational diabetes, hypertensive disorders of pregnancy, preterm birth, and cesarean birth. The increased risk is likely related to changes in egg quality and a higher prevalence of underlying health conditions with age.

Guidance from the American College of Obstetricians and Gynecologists notes that fertility declines gradually beginning around age 32 and more noticeably after about age 37. That is real information worth knowing, and it describes populations rather than any one person.

It is important to recognize that many women over 35 have healthy pregnancies and healthy babies: chronological age is not the same as biological age! Common imbalances we assess and address in functional medicine, such as inflammation, insulin resistance, nutrient deficiencies, hormonal shifts, stress, and insufficient sleep, influence egg quality and maternal health. By taking a personalized approach to identifying and addressing these root causes, we can support a woman's fertility journey.

RELATED: Egg quality vs. ovarian reserve: What actually matters for fertility?

How fertility changes with age and what functional medicine looks at differently

Most women are aware that they have the highest number of eggs at birth, and that egg quantity decreases steadily with age. However, egg quality may be a bigger contributor to fertility between 35 and 45. Egg quality is not just about the egg. It is also about the environment in which it develops. 

Research shows that as ovarian function declines, the surrounding tissue shows more fibrosis (scarring and loss of flexibility), endothelial (blood vessel) function declines, and there is increased stress-related nerve activity. These changes reduce egg nourishment and health. A 2025 study in Science that mapped human and mouse ovaries in three dimensions found sympathetic nerve fibers, the same branch of the nervous system involved in the stress response, woven through ovarian tissue and becoming denser with age. In mice, these nerves appeared to influence how follicles develop, which offers a fascinating window into how stress physiology and ovarian aging may be connected.

What are the drivers of changes in egg quality and the surrounding ovarian environment?

Mitochondrial dysfunction and ovarian aging

The ovaries are rich in mitochondria, the "energy powerhouse of the cell," which are also proverbial canaries in the coal mine. Mitochondrial dysfunction contributes to cellular aging and ovarian dysfunction. 

RELATED: Why mitochondrial health matters for egg quality

Factors that can negatively affect mitochondrial function include:

• Low levels of nutrients involved in energy production, such as B vitamins, magnesium, and CoQ10.

• Exposure to toxins such as BPA, microplastics, phthalates, and air pollution.

• Oxidative stress, an imbalance between free radical production and antioxidant neutralization. There are genetic susceptibilities to oxidative stress, but exposure to toxins along with diets high in excess calories, ultraprocessed foods, and not enough antioxidant and polyphenol-rich foods (think colorful vegetables and fruits!) are some of the biggest drivers.

Fibrosis, inflammation, and the ovarian environment

Fibrosis is a gradual stiffening or scarring of tissue, and in the ovary it can make the environment around developing eggs less flexible and less well nourished. It is seen with chronic immune stimulation and inflammation, which can occur with food allergies and sensitivities, gut microbial dysbiosis and/or increased intestinal permeability, and insulin and glucose dysregulation.

Endothelial function, healthy blood flow, and egg nourishment

The endothelium is the inner lining of blood vessels and can be negatively affected by ultraprocessed foods, nutrient deficiencies (magnesium, folate, and omega-3s), insulin dysregulation, toxic exposure, stress, high blood pressure, and oxidative stress.

Clinical clues worth discussing with your provider include elevated blood pressure (including "white coat" elevations), Raynaud's syndrome, or migraine headaches, since each can be a signal to look more closely at blood vessel health.

Stress, sympathetic activation, and hormonal signaling

Increased sympathetic activity is driven by chronic stress that occurs with insufficient sleep, overexercising, nutrient depletion from malabsorption or calorie restriction, and stressful work environments and relationships.

Stress also interacts with hormonal signaling and ovulation. In a prospective study of healthy women followed across their cycles, days of higher perceived stress were associated with lower estrogen and luteal progesterone, higher FSH, and higher odds of a cycle without ovulation. Those hormonal shifts can, in turn, increase stress reactivity, creating a feedback loop.

A simple way to think about it is that egg quality is shaped by more than age. Mitochondrial health, inflammation, blood flow, and stress signaling all influence the environment where eggs mature, and several of these respond to everyday habits.

Common patterns seen in functional medicine practice for AMA fertility

In practice, many women navigating unexplained infertility over 35 or secondary infertility share a handful of common patterns. These are not meant to be labels. Rather, they are areas functional medicine often assesses to support fertility at advanced maternal age.

Endometriosis and inflammation

Endometriosis affects about 1 in 10 women worldwide and can cause scarring that affects fertility. While many women with endometriosis have a history of heavy, painful periods, others have few symptoms until they experience difficulty conceiving.

Endometriosis is best diagnosed and managed with an endometriosis specialist. The underlying principles of functional medicine can complement specialty care by assessing contributors to inflammation, autoimmunity, gut dysbiosis, intestinal barrier integrity, and hormone processing, all of which play a role in endometriosis.

RELATED: Endometriosis FAQ: Understanding symptoms, testing, fertility & advocacy with expert Dr. Benjamin Zaghi 

Subtle thyroid dysfunction and autoimmunity (including Hashimoto’s)

The standard reference ranges for "normal" thyroid may not be optimal for ovulation and fertility and can miss reduced cellular conversion of thyroid hormone to its more active form. Autoimmune inflammation of the thyroid gland (Hashimoto's) can also contribute to thyroid dysfunction and affect fertility. 

RELATED: Hashimoto's wasn’t part of my pregnancy plan

Blood sugar dysregulation, insulin resistance, and ovulation

Blood sugar dysregulation and insulin resistance are common and are strongly influenced by diet and lifestyle. Insulin resistance is prevalent in women with polycystic ovary syndrome (PCOS) and contributes to hormonal dysregulation and less frequent ovulation. Learn more about 

RELATED: How blood sugar balance relates to fertility

Gut dysbiosis, intestinal permeability, and hormone balance

Gut dysbiosis and increased intestinal permeability influence hormone balance and contribute to chronic inflammation, autoimmunity, and insulin resistance. Celiac disease is a "do not miss" for any woman struggling with fertility, because you can have celiac disease as an adult without digestive symptoms. 

RELATED: Gut health and fertility: Why gut health matters for fertility and beyond 

Stress, fertility, and the emotional load of trying to conceive

As noted above, stress plays a role in ovarian aging, egg quality, and hormone regulation, and chronic stress has been associated with lower pregnancy rates in some studies of assisted reproduction. The research is genuinely mixed, though. A meta-analysis of 14 prospective studies found that emotional distress before an IVF cycle was not associated with whether that cycle resulted in pregnancy. That finding matters, because stress is never something to blame yourself for. It is simply one part of the picture that deserves care.

Stress can include physical stress, such as overexercising or overly restrictive diet patterns, insufficient sleep, and working long hours. Our perception of stress further increases its effects on our bodies. It is important to recognize the stress that can come from struggling to conceive and the emotional impact that may result. Having compassion for yourself, nourishing your body, taking time for restorative practices and rest, and talking to friends or finding support can help ease the impact of stress. 

RELATED:  What to do when you are stressed about the stress of TTC

Insufficient sleep and circadian dysregulation

Insufficient sleep (quality, quantity, and timing) contributes to insulin resistance, hormone dysregulation, and chronic inflammation. Sleep-disordered breathing can present differently in women and is commonly overlooked, while restless leg syndrome and insomnia are more prevalent in women.

Many of us are in a state of circadian dysregulation due to eating late, spending time on phones or screens before bed, having difficulty getting up in the morning, and relying on caffeine to get through our days.

How functional medicine can support fertility at advanced maternal age

Functional medicine supports fertility at advanced maternal age by looking for the factors that shape the internal environment, then building a personalized plan around nutrition, sleep, stress, movement, and targeted support, ideally in partnership with your OB-GYN or reproductive endocrinologist.

Comprehensive lab testing beyond standard fertility panels

In functional medicine, we start with a detailed history to gain insight into potential factors contributing to fertility and health, in addition to understanding your goals and concerns. Comprehensive testing beyond standard fertility panels can include:

• Thyroid markers (TSH, free T3 and T4, antibodies)

• Metabolic markers (fasting insulin, A1C)

• Inflammatory and oxidative stress markers

• Micronutrient status

• Hormone patterns across the cycle

• Salivary cortisol patterns throughout the day

• Mitochondrial metabolites

• Assessment of the gut microbiome and intestinal barrier health

• Screening of sleep quality and quantity

Not every test is right for every person, and your history should guide which ones make sense. 

RELATED: Is the “fertility cliff” the whole story? Understanding age, partner physiology, and what fertility testing misses

Supporting egg quality and cellular health (mitochondria, antioxidants, sleep)

Start with a foundation of a whole foods nutrition plan emphasizing protein quality and quantity, anti-inflammatory and endothelial-supporting fats from fish, nuts, seeds, and extra virgin olive oil, and an abundance of colorful vegetables and fruits such as dark leafy greens, cruciferous vegetables, and deeply pigmented berries.

• A 12-hour overnight fasting window between dinner and breakfast may be beneficial without negatively affecting fertility (especially during the luteal phase). This is different from skipping meals or long daytime fasts, which can work against stable blood sugar.

• Longer fasting intervals have been studied in small trials in women with PCOS, with early signs of more regular cycles. Larger trials are still needed, so longer fasting is best explored with guidance from your provider rather than on your own.

• Moderate exercise is one of the best-known lifestyle strategies to help regenerate mitochondria and support their function, in addition to its well-researched benefits for stress, mood, and insulin signaling. However, excessive exercise can increase free radical production and oxidative stress. Balancing movement and recovery time is key. 

• Antioxidant support from colorful fruits and vegetables, along with targeted nutrients where appropriate, may help support cellular health and mitochondrial function.

Sleep not only affects insulin signaling and inflammation, but newer research shows that sleep is important for mitochondrial regeneration and repair. Melatonin, which is involved in circadian rhythm regulation and starts to rise in the brain a few hours after dark, has powerful antioxidant and mitochondria-protective properties. Levels of glutathione, often called the "mother of all antioxidants," recover during sleep. A meta-analysis of prospective studies also found that regularly sleeping 7 hours or less was associated with modestly lower fertility compared with 8 hours.

Strategies to support sleep start in the morning: seeing sunlight, breaking your fast, and moving your body sends signals throughout the body and brain that it is day. Aim to keep wake times and sleep times as consistent as possible. In the evening, carving out enough time to wind down and ease into rest, creating a sanctuary that is dark, quiet, and cool, stopping screens at least 1 to 2 hours before bed, eating your last meal at least 3 hours before bed, and engaging in a relaxing practice such as gentle stretching or a warm bath can support the mitochondrial and metabolic benefits of sleep. 

RELATED: Does sleep affect fertility?

Nervous system & stress regulation (ovulation, implantation, resilience)

Because stress can influence estrogen, progesterone, and FSH signaling, fertility support at advanced maternal age often includes a nervous system lens: reducing chronic sympathetic activation and building parasympathetic "rest and restore" capacity through sleep, recovery, boundaries, and restorative practices.

Nutrition as a foundation for fertility after 35

For supporting egg quality and a healthy ovarian environment, reducing oxidative stress and inflammation, supporting insulin signaling and mitochondrial function, and supporting healthy hormone production and metabolism, nutrition becomes increasingly important as we get older.

Chronic stress, certain medications, gut imbalances, and food processing can affect nutrient needs and availability, and many women enter their late 30s with nutrient insufficiencies. The sooner the better to focus on healthy nutrition and micronutrient support for fertility and pregnancy.

The 3 to 6 month window before pregnancy is especially important: this is when eggs and sperm are maturing, nutrient stores are being drawn upon, and early placental development is being programmed.

A fertility-supportive diet focuses on adequate nourishment rather than restriction. Key components include the following:

• Adequate protein (including quality, quantity, and timing of intake) to support hormone production, detoxification pathways, immune function, egg and sperm development, uterine lining integrity, and early fetal tissue growth. 

• Blood sugar balance: pairing protein and fat with fiber-rich carbohydrates, avoiding long daytime fasts, and minimizing simple sugars can help support healthy blood sugar already within the normal range, which supports regular ovulation and a healthy pregnancy.

• Healthy fats are essential for hormone production and absorption of fat-soluble vitamins (A, D, E, and K). Extra virgin olive oil, nuts, seeds, and avocado are great sources. Omega-3 fatty acids from fatty fish like wild salmon, sardines, and small mackerel support a healthy inflammatory response, and research suggests higher omega-3 intake is associated with higher pregnancy rates.

• Micronutrients:

• Folate (B9): essential for DNA synthesis, cell division, and early neural development. Adequate folate status before conception is critical. 

• Iron: plays a role in ovulation and energy. In a large prospective study, women who used iron supplements had a lower risk of ovulation-related infertility, and many menstruating women are unknowingly low..

• Vitamin D: functions like a hormone and plays a role in ovulation, immune regulation, and implantation. 

• Choline: important for placental development and fetal brain development, yet commonly under-consumed. Early research is also exploring its role in egg health. 

• Antioxidants: may help protect developing eggs from oxidative stress, which tends to increase with age and inflammation.

RELATED: Complete guide to protein for fertility and pregnancy 

Lifestyle shifts that can positively impact fertility at advanced maternal age

Additional lifestyle strategies that can positively impact fertility:

• Prioritize sleep quality, quantity, and timing. Sleep helps regulate fertility hormones, supports stress resilience and insulin signaling, supports mitochondrial function, and helps manage inflammation and oxidative stress. Talk to your provider if you are having difficulty falling or staying asleep, have symptoms of restless leg syndrome, or wake up unrefreshed.

• Choose regular, moderate movement. It supports insulin sensitivity, endothelial function and healthy blood flow, and mood and stress resilience. Listen to your body and honor the balance between exertion and recovery.

• Take common-sense steps to reduce environmental toxin exposure:

• Minimize intake of packaged and processed foods

• Use glass food storage containers

• Consider a water filter and air filter

• Choose fish low in mercury and safe for pregnancy

• Support a healthy circadian rhythm by maintaining a consistent sleep and wake schedule and timing your eating, movement, and light exposure to align your brain, body, organ, and cellular clocks.

What should both partners know about fertility after 35?

Fertility is a shared equation, and the male partner's age and health matter too. A meta-analysis of 90 studies found that as men age, semen volume, sperm motility, normal sperm shape, and sperm DNA integrity tend to gradually decline. Sperm take roughly 90 days to develop, so the same window that supports egg health is a meaningful opportunity for sperm health as well.

The good news is that the pillars are largely the same for both partners: nourishing food, steady blood sugar, quality sleep, moderate movement, less alcohol, fewer environmental toxins, and support for stress. Preparing together can also ease the emotional load that so often lands on one person.

Partner steps worth considering:

• Start a shared preconception routine 3 to 6 months before trying, including meals, sleep, and movement goals.

• Ask about a semen analysis early rather than waiting, especially if either partner is over 35. Here is how male fertility testing works.

• Cut back on alcohol and nicotine together, and limit heat exposure to the testes (hot tubs, laptops on laps).

RELATED: Boosting male fertility: Why sperm health matters more than you think 

A reframing for women trying to conceive at advanced maternal age

For women trying to conceive over the age of 35, partnering with a functional medicine provider in addition to their OB-GYN or reproductive endocrinologist can help support the body's internal environment through a highly personalized approach. Identifying and addressing factors including nutrient deficiencies, toxin exposure, insulin resistance and cardiometabolic health, sleep disturbances, and gut health has the potential to support fertility as well as a healthy pregnancy, a healthy baby, and maternal health postpartum.

Fertility is not a countdown clock. It is a biological conversation. Age informs the approach and awareness, while biology shapes the outcome. Many women are able to conceive and have healthy pregnancies with the right support in place.

RELATED: Pregnancy after 35: A functional medicine guide to optimizing fertility naturally

An note form WeNatal on starting the conversation of advanced maternal age

Advanced maternal age often brings more questions, and it can also be an invitation to approach fertility with greater intention and support. As Dr. Cindy shared, fertility after 35 is not defined by age alone. Egg quality and reproductive health are shaped by factors we can influence, including inflammation, metabolic health, nutrient status, stress, sleep, and the overall internal environment that supports hormone signaling and cellular function.

Nutrition plays a central role in this process, especially in the 3 to 6 month preconception window when eggs and sperm are maturing. Here is how we can help, wherever you are starting:

• Start with a plan. Download the free WeNatal Guide: Trying to Conceive (For Her and Him) for a clear roadmap of the months before pregnancy.

• Build your foundation. WeNatal for Her offers 24 key nutrients for preconception and pregnancy.* Subscribers also receive a free consult with a registered dietitian.

• Add targeted support. The Fertility Power Duo pairs For Her with Egg Quality+, which combines CoQ10, NAC, acetyl-L-carnitine, alpha lipoic acid, and PQQ to support egg cell energy production and antioxidant defenses during preconception.

• Bring your partner in. WeNatal for Him supports healthy sperm, and WeNatal Together makes it easy to prepare side by side.

• Round out your routine. Omega DHA+ provides DHA and EPA to support reproductive health and, later, baby's brain development.

None of this is a quick fix or a replacement for medical care. It is steady support while you build a strong foundation for conception and pregnancy. You may also be able to use your HSA or FSA for WeNatal prenatals.

Want to hear more from Dr. Geyer? WeNatal was proud to partner with The UltraWellness Center on their UltraLearning Series Functional Fertility conversation, led by Dr. Cindy Geyer and Lisa Dreher, MS, RDN, LDN. Watch the replay for a compassionate, practical discussion designed to help you feel informed, supported, and not alone.

Wherever you are on your path to parenthood, we are honored to be part of the conversation. Better together.

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