Egg Quality Is Not Just About Age
How the preconception environment can influence fertility outcomes.
Age matters in fertility. There is no responsible conversation about egg quality that avoids this. Egg number and egg quality both decline with age, particularly from the mid-30s onward, and this can affect the chance of conception, miscarriage risk and IVF outcomes.
But age is not the whole story.
Egg development happens inside a biological environment. That environment is shaped by hormones, inflammation, oxidative stress, nutrient status, blood sugar regulation, thyroid function, sleep, stress physiology and overall metabolic health. These factors cannot reverse ovarian age, but they may influence the conditions in which eggs mature.
This distinction matters. Fertility care can become heavily focused on timing, scans and procedures, while the foundations of health are treated as secondary. At Elgin House, we see those foundations as part of the fertility picture — especially for people navigating fertility after 35, endometriosis, PMOS/PCOS, recurrent loss, IVF, egg freezing or unexplained fertility challenges.
What do we mean by egg quality?
Egg quality refers to the egg’s ability to mature, fertilise, divide normally and support early embryo development. It is influenced by chromosomes, mitochondrial function, cellular energy production and the follicular environment around the egg.
As we age, eggs are more likely to have chromosomal errors. This is one reason fertility declines and miscarriage risk increases over time. But egg quality is also influenced by the internal environment of the ovary — and that is where supportive care may play a role.
The follicle environment matters
Eggs do not mature in isolation. Each egg develops inside a follicle, surrounded by fluid, hormones, nutrients and signalling molecules. This environment is sensitive to inflammation, oxidative stress and metabolic signals.
That means preconception care is not just about taking a prenatal vitamin once pregnancy begins. The months before conception can be an important window to assess and support the systems that influence reproductive health.
Oxidative stress and mitochondrial energy
One of the major areas of fertility research is oxidative stress. Oxidative stress occurs when the body’s production of free radicals outweighs its antioxidant defences. In the ovary, this can affect mitochondria — the energy-producing structures inside cells.
Mitochondria are especially important in eggs because early development requires significant cellular energy. Research links ovarian ageing with mitochondrial dysfunction and oxidative stress, which may contribute to poorer egg quality over time.
This does not mean antioxidants are a magic fix. It means nutrition, inflammation, sleep, metabolic health and environmental exposures all deserve consideration when preparing for conception.
Metabolic health and blood sugar
Blood sugar regulation is another important part of the fertility conversation. Insulin resistance, PMOS/PCOS and metabolic dysfunction can influence ovulation, hormone signalling and the inflammatory environment.
For some patients, improving metabolic health may support more regular ovulation, reduce inflammatory load and improve overall preconception wellbeing. This might involve nutrition support, resistance training, sleep regulation, stress support and targeted clinical assessment.
Inflammation and fertility
Inflammation is not inherently bad. It is part of the immune system’s normal response. But chronic or dysregulated inflammation may affect reproductive health, particularly in conditions such as endometriosis, PMOS/PCOS, autoimmune disease and chronic pelvic pain.
Research into anti-inflammatory dietary patterns, including Mediterranean-style eating patterns, suggests potential benefits for fertility and assisted reproductive technology outcomes. The goal is not restriction. It is to create a more supportive internal environment through nutrient density, fibre, healthy fats and adequate protein.
Thyroid, nutrients and the bigger picture
Thyroid function, iron status, vitamin D, folate, B12, iodine, omega-3 intake and overall nutrient sufficiency can all influence fertility and pregnancy preparation. For people with heavy periods, endometriosis, gut symptoms, restrictive diets or fatigue, nutrient assessment can be particularly relevant.
This is why a personalised approach matters. Two people of the same age can have very different fertility foundations.
Sperm quality belongs in the conversation too
Egg quality is only one part of embryo health. Sperm quality also contributes to fertilisation, embryo development and pregnancy outcomes. Sperm can be influenced by oxidative stress, heat exposure, alcohol, smoking, metabolic health, sleep, inflammation, age and nutrient status.
Fertility support should not fall on one person alone. Where sperm is part of the pathway, it deserves the same level of attention and optimisation.
What can be supported?
A thoughtful fertility plan may include assessment and support across several areas:
• Hormonal status and ovulation patterns
• AMH, antral follicle count and fertility specialist review where appropriate
• Thyroid function and metabolic markers
• Nutrient status, including iron, vitamin D, B12 and folate
• Blood sugar regulation and insulin resistance
• Inflammation, gut symptoms and immune patterns
• Sleep, stress physiology and nervous system regulation
• Sperm health where relevant
The Elgin House approach
At Elgin House, fertility care is not reduced to timing alone. We bring together specialist medical assessment and holistic support to help patients understand what may be influencing their reproductive health.
Our fertility specialists can support assessment of ovarian reserve, AMH, antral follicle count, hormonal status and reproductive planning. Naturopathy can support the foundations of fertility, including nutrient status, blood sugar regulation, inflammation and egg and sperm quality. Acupuncture may support the preconception window, as well as patients undergoing IVF or egg freezing, by helping regulate the nervous system and support whole-body wellbeing.
No approach can guarantee a pregnancy. But a comprehensive plan can help identify what is measurable, modifiable and worth supporting before conception or treatment begins.
A final note
If you are trying to conceive, considering IVF, planning egg freezing or wondering whether your body is ready for pregnancy, the earlier you seek support, the more time there is to understand the full picture.
Egg quality is influenced by age — but your fertility story is not only age. It is biology, timing, environment, support and care.
If you would like personalised guidance, you can book a consultation with the Elgin House team to explore the right fertility pathway for your needs.
References
American Society for Reproductive Medicine. Optimizing natural fertility: a committee opinion. Fertility and Sterility / ASRM Practice Guidance, 2022. https://www.asrm.org/practice-guidance/practice-committee-documents/optimizing-natural-fertility-a-committee-opinion-2021/
ESHRE / International Reproductive Health Education Collaboration. Female fertility and age. Patient information leaflet. https://www.eshre.eu/-/media/sitecore-files/SIGs/GSCA/IRHEC/Leaflets/ESHRE---Female-fertility-and-age.pdf
Stephenson J, et al. Before the beginning: nutrition and lifestyle in the preconception period and its importance for future health. The Lancet, 2018.
Alesi S, et al. Anti-Inflammatory Diets in Fertility: An Evidence Review. Nutrients, 2022.
Sasaki H, et al. Impact of Oxidative Stress on Age-Associated Decline in Oocyte Quality. Frontiers in Endocrinology, 2019.
Moghadam ARE, et al. Oocyte quality and aging. JBRA Assisted Reproduction, 2022.
ReproductiveFacts.org / ASRM. Optimizing Natural Fertility patient education fact sheet. https://www.reproductivefacts.org/news-and-publications/fact-sheets-and-infographics/optimizing-natural-fertility/