Wouldn’t it be great if there was a foolproof way to evaluate human eggs quality and be able to use that information to help in the investigation as to the cause(s) of infertility issues? But alas, there is not. Though there are tests for the quantity of eggs in the ovaries, there aren’t reliable tests for quality, which means some assumptions have to be made about their viability from a quality standpoint (3).
When a female fetus develops in the uterus, all of the eggs that she will ever have also develop. The number may range from 6 to 7 million eggs to begin with, but even before birth, those eggs begin to die off. By the time the baby is born, the amount of eggs is reduced to about 1 million. Of those, only about 300 to 400 eggs will be released in a woman’s lifetime during ovulation throughout her reproductive years (1). In this post, we examine 3 factors that contribute to egg quality during a woman’s fertile years.
Lifestyle makes a difference on egg quality, but to what extent is unclear (2). Here is what science tells us about lifestyle factors and egg quality:
It’s important to think about where you work, live, and play when considering factors that may impact the complexities of reproduction, and that includes harmful environmental exposure. This can include things like pesticides, toxic chemicals, highly concentrated dust particles (like in woodworking), solvents, lead, and X-rays are all negative culprits (2).
Here are the top 5 toxins that have been clinically proven to impact fertility (8):
The only current reliable indication of egg quality, surprisingly enough, is age. The reason we know this is because of the high rate of successful pregnancies with the donated eggs of women in their 20’s versus the donated eggs of older women (4). The old cliché that a woman’s “biological clock is ticking” has some science to it. As our society has changed and evolved, the average age of marriage (5) and having children has increased (6), and with it, challenges with fertility. Unfortunately, the physically ideal age to have children hasn’t evolved with our changing lifestyle.
Egg quality diminishes over time and occurs much earlier than many women think (4). While the exact age at which egg quality declines depends on the individual, on average fertility begins to drop in the late 20s or early 30s (4). The decline speeds up after age 35. The supporting evidence that age plays such a vital role in egg quality is in studies done that show a high success rate of pregnancy using donated eggs from women in their 20s (4).
While age is the most determining factor for egg quality, and you can’t control for your age, it doesn’t mean you have nothing you can do. As long as you still have some eggs left, you can improve your lifestyle to increase your chances of getting pregnant — and of course get your partner involved too!
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