Supporting egg quality: why the final 90 days matter biologically

Why the final 90 days matter

Women are born with all the eggs they'll ever have, which often leads people to assume that nothing can influence egg quality.

But while the eggs themselves are present from before birth, the months before ovulation are a crucial period of development.

During this time, the egg undergoes its final stages of maturation, including the process of reducing its chromosome number from 46 to 23.

This is a critical step. Eggs with the wrong number of chromosomes are unlikely to result in a baby. Women produce more eggs with the wrong number of chromosomes as they get older, and this is a major reason why fertility declines with age.

While we can't change the age of an egg, we can influence the environment in which that final maturation process takes place.

While no lifestyle approach can guarantee outcomes, gentle, consistent support during this time can help create favourable conditions for egg health, hormone balance, and uterine receptivity.

Below are key lifestyle factors to focus on in the three months before you start trying to get pregnant or before starting an IVF cycle.

1. Prioritise sleep and darkness

Sleep is one of the most underestimated aspects of reproductive health.

During deep, high-quality sleep, the body produces melatonin — a hormone best known for regulating circadian rhythm, but also one that acts as a powerful antioxidant in the ovaries. Melatonin helps protect developing eggs from oxidative stress, which naturally increases with age and environmental exposure.

Supportive habits:

• Aim for 7–9 hours of sleep per night
• Keep the bedroom cool, dark, and quiet
• Avoid screens and bright lights in the hour before bed
• Use blackout curtains or an eye mask if needed

Even small improvements in sleep consistency can make a difference over time.

2. Choose gentle, regular movement

Light to moderate exercise supports circulation, insulin sensitivity, stress regulation, and hormonal signalling — all important for egg development.

The goal here isn’t intensity, but consistency.

Examples of supportive movement:

• Walking
• Yoga or Pilates
• Swimming
• Light strength training

Very intense or excessive exercise can be a stressor, so focus on movement that feels relaxing and energising rather than pushing the body.

3. Focus on whole, nutrient-dense foods

Egg development is a nutrient-dependent process. In the months before ovulation, prioritising whole foods helps provide the building blocks needed for healthy cell division and mitochondrial function.

A supportive pattern includes:

• Colourful vegetables and fruits for antioxidants
• Quality protein, such as eggs, fish, poultry and meat
• Healthy fats, such as olive oil, avocado, nuts, seeds, dairy and meat

Rather than perfection, think variety and regular nourishment.

4. Balance blood sugar

Blood sugar stability plays an important role in hormone signalling and ovarian function.

Frequent spikes and crashes can contribute to inflammation and disrupt hormonal balance — particularly relevant for ovulatory timing.

Helpful strategies:

• Eat regular meals
• Include protein, fibre and fat at each meal
• Avoid skipping meals or relying heavily on refined carbohydrates
• Pair carbohydrates with protein or fat to slow absorption

These gentle adjustments support overall metabolic and reproductive health.

5. Limit alcohol and avoid smoking

Alcohol and smoking are both associated with increased oxidative stress and reduced egg quality.

In the three months before ovulation or IVF:

• Limiting alcohol helps reduce oxidative load on developing eggs. You don't have to cut it out completely if you don't want to, but definitely avoid binge drinking and ensure you have several alcohol-free days a week. You may find that your sleep improves when you avoid alcohol.
• Not smoking, and avoiding second-hand smoke, is one of the most impactful lifestyle steps for egg and embryo health.

6. Support nutrition with targeted supplementation

Even with a well-balanced diet, it can be helpful to support intake of certain nutrients to ensure consistency — especially during times of increased demand.

A prenatal multivitamin can help:

• Support overall nutritional intake
• Reduce the likelihood of key micronutrient deficiencies
• Provide reassurance during a nutritionally important phase

In addition, other nutrients that are often considered for egg health are:

CoQ10

CoQ10 supports mitochondrial function and acts as an antioxidant. Mitochondria are especially important for egg maturation and early embryo development.

Omega-3 fatty acids

Omega-3 fatty acids support anti-inflammatory pathways and are involved in cell membrane health. They may also help support uterine lining and the overall reproductive environment.

Supplement choices should always be individual, and it’s appropriate to discuss them with a healthcare professional if you have specific medical considerations.

A gentle reminder

Egg quality is influenced by many factors — age, genetics, underlying health and environment — many of which are outside of your control.

Lifestyle support shouldn't be about restriction, perfection or blaming yourself. Instead, it's about creating the most supportive conditions possible in the time available.

Small, steady changes over three months can be meaningful, and they can help you feel more grounded and supported whilst trying to conceive or in the run up to IVF.

Photo by Kelly Neil on Unsplash.