Fertility After 35: Evidence-Based Steps to Optimize Your Chances in Toronto

What Actually Happens to Fertility After 35

The term "advanced maternal age" sounds dramatic, and honestly, it's one of those medical labels that creates more anxiety than clarity. Here's what's actually going on biologically. Every person with ovaries is born with a fixed number of eggs. That number declines gradually throughout life, and the rate of decline does increase after age 35. By 40, it accelerates further. This is a real physiological process, not a scare tactic.

What matters just as much as the number of eggs is egg quality. As eggs age, they're more likely to have chromosomal abnormalities, which can affect fertilization, implantation, and early pregnancy viability. This is the primary reason miscarriage rates increase and conception rates decrease with age. It's not that your body suddenly "breaks" at 35. It's that the odds shift gradually.

But here's the part the headlines leave out. Many women over 35 conceive without difficulty. The decline is a population-level trend, not an individual verdict. Your personal fertility depends on a whole constellation of factors including your ovarian reserve, overall health, hormonal balance, and your partner's reproductive health. Knowing where you stand through proper testing gives you information you can actually act on, which is far more useful than worrying about a number on a birthday cake.

Fertility Testing: What to Ask For and Why

If you're thinking about getting pregnant over 35, one of the smartest things you can do is get baseline fertility bloodwork before you start trying. This isn't about labeling yourself as fertile or infertile. It's about building a clear picture of your reproductive health so you and your provider can make informed decisions together.

AMH (Anti-Müllerian Hormone)

AMH is a blood test that gives an estimate of your ovarian reserve. It measures a hormone produced by the small follicles in your ovaries. A higher AMH generally suggests a larger remaining egg supply, while a lower AMH may indicate a diminished reserve. This test can be done on any day of your cycle, which makes it convenient. Keep in mind that AMH tells you about quantity, not quality. A lower AMH doesn't mean you can't conceive. It means time may be more of a factor in your planning.

Thyroid Panel and Other Key Bloodwork

Thyroid function plays a surprisingly large role in fertility. Both hypothyroidism and hyperthyroidism can disrupt ovulation and increase the risk of miscarriage. A full thyroid panel including TSH, free T4, and thyroid antibodies is a standard part of a thorough preconception workup. Your provider should also check your fasting glucose and insulin levels, since insulin resistance can quietly impair ovulation. Vitamin D, iron studies, and a CBC round out the picture.

Day 3 Hormones

FSH (follicle-stimulating hormone) and estradiol measured on day 3 of your menstrual cycle give additional insight into how hard your body is working to recruit follicles each month. Elevated FSH can signal that your ovaries need more stimulation to produce mature eggs. Combined with AMH, these results help create a fuller picture. If you have irregular cycles, your healthcare provider can guide you on the best timing for these tests.

Lifestyle Factors That Genuinely Impact Egg Quality

You can't reverse the biological clock, but you can influence egg quality and overall reproductive readiness through lifestyle choices. The research here is encouraging. The roughly 90-day window before an egg is ovulated is a period when its environment matters considerably. What you do during those three months can affect the egg that eventually becomes a potential pregnancy.

Nutrition and Weight

A Mediterranean-style eating pattern is the dietary approach most consistently linked to better fertility outcomes in the research. This means plenty of vegetables, healthy fats from olive oil and nuts, whole grains, and lean protein. Reducing processed foods and refined sugars helps maintain steady blood sugar levels, which supports hormonal balance. Being significantly underweight or overweight can disrupt ovulation, so if weight is a concern, working with your provider to find a sustainable approach is worthwhile.

Movement and Stress

Moderate, regular exercise supports fertility. It improves insulin sensitivity, reduces inflammation, and helps manage stress. The key word is moderate. Intense endurance training or significant caloric deficits can actually suppress ovulation. Think brisk walks, yoga, swimming, or strength training a few times per week. Toronto has no shortage of options here, from the Beltline Trail to community fitness classes across the city.

Chronic stress deserves more attention than it usually gets in fertility conversations. Sustained high cortisol can interfere with the hormonal cascade that triggers ovulation. You don't need to eliminate all stress. That's unrealistic. But building consistent stress-reduction practices into your routine, whether that's mindfulness, therapy, creative hobbies, or simply protecting your downtime, can make a measurable difference.

Sleep and Environmental Exposures

Sleep is when your body does its most critical hormonal regulation. Disrupted or insufficient sleep can alter levels of luteinizing hormone, FSH, and estrogen, all of which are central to ovulation. Aim for seven to nine hours in a dark, cool room. If you're a shift worker, this is an especially important conversation to have with your healthcare provider.

Environmental toxins are harder to control, but some exposure reduction is practical. Bisphenol A (BPA) and phthalates found in certain plastics have been linked to reduced fertility. Switching to glass food containers, avoiding heating food in plastic, and choosing fragrance-free personal care products are small changes that reduce your chemical load over time.

Supplements and Medications: What the Evidence Says

Walk into any health food store on Bloor Street and you'll find shelves of supplements marketed for fertility. Some have genuine evidence behind them. Others are mostly marketing. Here's what's supported by current medical consensus.

Prenatal Vitamins and Folate

Start a prenatal vitamin with at least 400 micrograms of folic acid (or methylfolate if you have an MTHFR variant) at least three months before you start trying to conceive. Folate is critical for preventing neural tube defects in early pregnancy, often before you even know you're pregnant. A good prenatal should also include iron, vitamin D, iodine, and DHA.

CoQ10 and DHEA

Coenzyme Q10 (CoQ10) is one of the more promising supplements for egg quality in women over 35. It supports mitochondrial function in eggs, and mitochondrial energy is essential for healthy cell division after fertilization. Doses in the range of 400 to 600 mg daily are commonly recommended in fertility contexts. DHEA is sometimes used to improve ovarian response, but it's a hormone and should only be taken under the guidance of your healthcare provider, since inappropriate use can cause side effects.

Vitamin D and Omega-3s

Vitamin D deficiency is extremely common in Toronto, especially through our long winters. Low vitamin D has been associated with lower fertility rates and increased risk of pregnancy complications. Most providers recommend 1,000 to 2,000 IU daily, though your ideal dose depends on your blood levels. Omega-3 fatty acids from fish oil support healthy inflammation levels and have been linked to improved embryo quality in some research.

If you're pregnant, breastfeeding, or planning a pregnancy, check with your provider before starting any new medication or supplement. This includes over-the-counter products that seem harmless. Some herbal supplements, for example, can interfere with hormonal medications or aren't well-studied in pregnancy. If you take other medications, your provider can help you choose options that won't cause interactions.

Preconception Health: The Full Picture

Fertility optimization isn't just about eggs and hormones. Your overall health going into pregnancy affects everything from conception to delivery to your baby's long-term outcomes. A thorough preconception assessment looks at the whole picture.

Chronic Conditions

If you have a chronic condition like diabetes, hypertension, PCOS, endometriosis, or an autoimmune disorder, getting it well-managed before pregnancy is one of the most important things you can do. Uncontrolled blood sugar, for example, significantly increases the risk of birth defects in the first trimester. PCOS is one of the most common causes of ovulatory infertility, but with proper management it's also one of the most treatable. At Care&, our Nurse Practitioners work with you through Chronic Disease Management visits to get conditions optimized before you start trying.

Medications Review

Some medications that are safe for everyday use are not safe during pregnancy. This includes certain blood pressure medications, some antidepressants, retinoids for acne, and specific anti-seizure drugs. A preconception medication review with your NP ensures you're switched to pregnancy-safe alternatives well before conception. Don't stop any prescribed medication on your own. Always work with your provider to make safe transitions.

Screening and Immunizations

Before pregnancy, you'll want to confirm immunity to rubella and varicella, since both infections during pregnancy can cause serious harm to a developing baby. If you need a booster, it's best to get it at least one month before trying to conceive, since these are live vaccines. Your provider should also screen for STIs including chlamydia and gonorrhea, which can affect tubal health, and check your Pap test status. Genetic carrier screening for conditions like cystic fibrosis and spinal muscular atrophy is available and worth discussing with your healthcare provider, especially if you have a family history of genetic conditions.

Your Partner's Health Matters Too

About 40% of fertility challenges involve a male factor. Sperm quality is influenced by many of the same lifestyle factors that affect egg quality. Smoking, excessive alcohol, obesity, heat exposure, and certain medications can all impair sperm count and motility. A semen analysis is a straightforward first step if conception isn't happening within the expected timeframe. Encourage your partner to join you in the preconception health optimization process. It's a team effort.

When to See Your Nurse Practitioner

Ideally, you'd book a preconception health visit three to six months before you start trying to conceive. This gives you time to get bloodwork done, optimize any chronic conditions, start supplements, and make lifestyle adjustments that need those 90 days to impact egg quality. If you're already trying, it's not too late. Getting this workup done now still gives you valuable information.

If you've been trying to conceive for six months without success (the recommended timeline for women over 35, compared to 12 months for younger women), it's time to talk to your provider about next steps. This might include a referral for a semen analysis, imaging like a hysterosalpingogram to check your fallopian tubes, or a referral to a fertility clinic. Ontario does have some OHIP-covered fertility services, and your Nurse Practitioner can help coordinate those referrals.

We know that many people in Toronto are without a family doctor right now. Wait times for OHIP-covered providers can stretch months, and when you're thinking about fertility after 35, time matters. Care& offers a Family Practice model where you're matched with a dedicated NP who can order all the testing you need, create a personalized preconception plan, and follow you through as many visits as it takes. Appointments are unrushed, start on time, and are often available same-day. That kind of access can make a meaningful difference when you're trying to conceive and every cycle counts.

If you already have a family doctor through OHIP but can't get an appointment for weeks, or your visits feel too rushed to address something as involved as preconception planning, Care& can fill that gap. Some members use their Care& NP specifically for their fertility journey while keeping their OHIP physician for other needs. For families already thinking ahead to newborn care, Care& also offers Pediatric Care services, so your baby can be seen by the same trusted practice from the very start.

Frequently Asked Questions