Improving egg quality: a complete guide to increasing fertility

Egg quality is a determining factor in female fertility and in the success of both natural and assisted reproduction pregnancies. Although ovarian aging is an inevitable biological process, scientific evidence shows that there are factors that can help optimize oocyte quality and improve reproductive potential.

What is meant by oocyte quality?

Oocyte quality refers to the ability of an egg to be fertilized and produce a viable embryo, with the potential to implant and develop into a viable pregnancy.

The American Society for Reproductive Medicine (ASRM) differentiates between oocyte quality and ovarian reserve. They note that quality is closely related to the age and chromosomal integrity of the egg. 

Difference between egg quantity and quality

The quantity of eggs refers to the number of oocytes available in the ovaries, while the quality is related to their biological competence. It is important to be aware that a good ovarian reserve does not guarantee good egg quality. This depends – to a large extent – on the age and cellular state of the egg.

Factors that influence egg quality

The quality of eggs does not depend on a single element, but on the balance between biological, genetic and environmental factors that influence their proper development. Some of these factors cannot be modified, such as age or genetic makeup. However, others are closely related to general health, the hormonal environment, and cellular stress levels. Understanding which aspects influence oocyte quality allows for more informed strategies to optimize female fertility, both naturally and before starting assisted reproduction treatment.

Reproductive age and ovarian reserve

Age is the most decisive factor in egg quality. From the age of 35, the risk of chromosomal abnormalities in the eggs progressively increases. This translates into a lower pregnancy rate and a higher risk of miscarriage.

Genetics and hormonal health

Hormonal disturbances can interfere with the maturation of the egg and its ability to be fertilized. Endocrine disorders, such as thyroid disorders or hyperandrogenism, can negatively affect oocyte quality.

Oxidative stress and cellular aging

Oxidative stress is one of the cellular mechanisms most closely related to the deterioration of egg quality. Frontiers explains that excess reactive oxygen species damage the mitochondria of the oocyte. This reduces its energy capacity and increasing chromosomal errors.

Lifestyle habits that help improve oocyte quality

Lifestyle directly influences female reproductive function. Factors like rest, stress management, and physical activity can create a more favorable environment for the development of higher-quality eggs. Adopting healthy habits is one of the most accessible strategies to support fertility, especially before seeking pregnancy or starting treatment.

The importance of rest and circadian rhythm

Getting the necessary amount of sleep and respecting your circadian rhythms supports hormonal balance and the proper functioning of the reproductive axis. Ongoing lack of rest can alter the release of hormones involved in ovulation and negatively impact egg quality.

Chronic stress and its impact on fertility

Prolonged stress can influence female fertility by altering hormone regulation and increasing oxidative stress. Relaxation techniques or psychological support can be helpful tools for improving overall well-being and fostering a healthier reproductive environment.

Physical exercise: how much and what type is recommended

Regular, moderate-intensity physical activity helps improve metabolism, circulation, and hormonal function. However, intense or extreme exercise can have the opposite effect, causing alterations in the menstrual cycle and ovulation. Balance is key to supporting ovarian health.

Diet aimed at improving egg quality

Nutrition plays a fundamental role in reproductive health. A balanced diet provides the nutrients needed for cell protection, the reduction of oxidative stress, and the proper functioning of the hormonal system.

Certain micronutrients, such as folic acid, omega-3 fatty acids, antioxidant vitamins and certain trace elements, are involved in oocyte maturation and protection against cell damage. A varied diet rich in fresh foods helps meet these needs.

Foods that promote female fertility

Regularly consuming fruits and vegetables, oily fish, nuts, legumes, and extra virgin olive oil is linked to better reproductive health. These foods provide natural antioxidants and healthy fats that contribute to a more favorable ovarian environment.

Foods that should be limited or avoided

Ultra-processed foods, rich in trans fats, refined sugars, and additives, can promote inflammation and oxidative stress. Reducing their intake is part of a comprehensive strategy to preserve egg quality.

In some cases, a specialist may recommend specific supplements to support ovarian function, especially for women of advanced reproductive age or those with certain medical conditions. Supplementation should always be personalized and supervised, as not all supplements are necessary or suitable for every woman.

Environmental toxins and their effect on eggs

Tobacco accelerates ovarian aging and is associated with a decrease in oocyte quality. Alcohol consumption can also interfere with hormonal function and reduce the chances of pregnancy, so avoiding it, or limiting it as much as possible, is recommended.

Exposure to certain chemicals found in plastics, cosmetics and cleaning products can alter the hormonal system and affect the maturation of eggs. These compounds, known as endocrine disruptors, are increasingly present in our everyday environment.

Opting for plastic-free packaging, choosing safer cosmetics, and prioritizing fresh food can help minimize exposure to substances that may potentially undermine fertility.

Medical problems that can affect oocyte quality

Certain medical conditions can compromise the quality of eggs and make it harder to get pregnant. Some of them directly affect how the ovary functions, while others create an unfavorable inflammatory or hormonal environment. Identifying and treating these issues early is key to protecting reproductive health.

Endometriosis and polycystic ovary syndrome

Endometriosis and PCOS can alter the ovarian environment and affect both ovulation and egg quality. A proper medical approach helps minimize their impact on fertility.

Autoimmune and metabolic diseases

Autoimmune diseases, obesity, and metabolic disorders can negatively impact ovarian function. Medical monitoring and lifestyle changes are essential to protect reproductive health.

The importance of early diagnosis

Detecting these issues early allows for the implementation of personalized strategies to preserve or improve female fertility.

Medical treatments to improve egg quality

When there are challenges in conceiving or factors affecting egg quality, reproductive medicine offers various strategies to maximize the chances of pregnancy. These approaches don’t always aim to change the intrinsic quality of the egg, but rather to improve the conditions in which it develops and to select those with the greatest reproductive potential.

• Before starting assisted reproduction treatment it is advisable to optimize lifestyle habits and overall health to maximize the chances of a successful outcome.
• Ovarian stimulation does not improve the intrinsic quality of the eggs, but it does make it possible to obtain and select those with the greatest reproductive potential.
• Current reproductive medicine is committed to an individualized approach, adapting strategies to the age, diagnosis and characteristics of each woman.

Improving oocyte quality is not an immediate process. Changes in lifestyle, diet, or medical treatment take time to affect egg development. Therefore, it’s important to have realistic expectations and understand the biological timelines involved before evaluating results or starting treatments.

Dr. Isabel Peterlunger

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