“Many women are told there is little they can do to improve egg quality, but the latest research defies that old assumption. The four-month growth phase before ovulation is a critical time during which many things can happen that affect the quality of the egg, both positively and negatively.”

This reflects the takeaway to Empower Yourself Through Evidence-Based Self-Care Practices. Fett reframes fertility as an area where readers are not powerless, as research shows that diet, supplements, and environmental adjustments during the egg’s growth phase can make a measurable difference. Readers can take this as encouragement to engage proactively with their fertility health rather than accepting outdated advice.

“Chromosomal abnormalities in eggs have a profound impact on fertility because at every stage of development from fertilization onward, an embryo formed from a chromosomally abnormal egg has much less potential to continue developing.”

This illustrates the takeaway to Use Science to Demystify Fertility. By grounding fertility challenges in chromosomal science rather than vague explanations, Fett helps readers understand why age and egg quality matter so much. Knowing the biological cause equips individuals to approach treatment options and lifestyle changes with clarity instead of confusion or blame.

“Poorly functioning mitochondria may be one of the most important reasons some women’s eggs are more likely to end up with chromosomal abnormalities or otherwise lack the potential to become a viable embryo.”

This ties to the takeaway of understanding how lifestyle and biology intersect in conception. Fett highlights the role of mitochondria as the “powerhouses” of the cell, showing that energy production directly affects chromosomal stability and egg viability. Readers can apply this knowledge by focusing on lifestyle choices and supplements that support mitochondrial health (for instance, CoQ10 supplementation), turning a complex biological idea into practical action.

“The most recent studies suggest that these chemicals may only impact fertility in couples with unusually high levels of exposure. The goal, then, is not a complete lifestyle overhaul, but rather making a few changes that have the most impact. This will not only help protect egg quality and get your body ready for a healthy pregnancy but will have the added bonus of creating a healthy and nontoxic home for your future baby.”

This connects to the takeaway to Identify and Address Environmental Toxins as Hidden Barriers to Reproductive Health. Fett reframes environmental adjustments to be strategic rather than overwhelming, as she emphasizes that a few targeted actions, like swapping out plastics or cutting processed foods, can yield meaningful results. This approach empowers readers to focus on impactful adjustments without the pressure of perfectionism, which makes the guidance both realistic and sustainable.

“Bisphenols and phthalates are found in a variety of different places—from cosmetics to cleaning products to kitchenware to processed food. But the latest studies provide guidance on the sources of exposure that matter most. As a result, we can avoid unusually high levels of BPA and phthalates with just a few changes to the food we eat, the plastic we use in the kitchen, and the cosmetics and cleaning products we buy.”

This reinforces the takeaway of identifying and addressing environmental toxins as hidden barriers to reproductive health. Fett highlights that small, intentional swaps, like replacing plastic containers with glass or choosing fragrance-free products, can significantly lower exposure. The point isn’t to eliminate every risk, but to prioritize the most influential sources of toxins, which can make fertility protection manageable in daily life.

“Vitamin D is also important for preventing miscarriage. […] In one clinical study that involved frozen embryo transfers with genetically normal embryos, the miscarriage rate was 27% in women with a deficiency but just 7% in women with adequate vitamin D.”

This illustrates the takeaway of empowering oneself through evidence-based self-care practices. Fett shows how something as simple as testing and correcting a vitamin deficiency can drastically affect outcomes. For readers, this aims to make fertility feel less like fate and more like an area where proactive, science-based steps, such as monitoring vitamin D, can improve the chances of sustaining a pregnancy.

“When trying to conceive, it is common for important lab tests to be overlooked, and for values to be compared to standard reference ranges that are inadequate for fertility. To rule out simple factors that can stand in the way of getting pregnant and having a healthy pregnancy, consider getting tested for: 

• vitamin B12 deficiency 
• vitamin D deficiency 
• thyroid function, including active hormone levels and thyroid antibodies. 

It also helpful to compare your value to the optimal range for fertility, rather than the normal range.”

This reflects the takeaway to Tailor Medical Knowledge to Make Informed and Personalized Decisions. Fett highlights how conventional lab “normal” ranges may not align with fertility goals. By seeking fertility-specific benchmarks for tests like vitamin D, B12, and thyroid function, readers can personalize their care and uncover correctable issues that may otherwise go unnoticed.

“FSH used to be the primary test used for assessing ovarian reserve, but doctors have come to rely more heavily on AMH since research has shown that AMH is better at predicting chances of success in IVF cycles. Typically, low AMH and high FSH go hand in hand. If both suggest age-related decline in ovarian reserve or premature ovarian aging, the odds of success in IVF are lower. But if there is a discrepancy and only one number is abnormal, studies have shown that AMH is the more reliable indicator of your chance of becoming pregnant through IVF.”

This aligns with the key takeaway of using science to demystify fertility. Fett shows how advances in research have shifted clinical practice, making AMH a more accurate predictor than the older FSH standard. For readers, this illustrates how relying on updated science can provide clearer expectations and guide better fertility planning.

“To understand your starting point and where to focus your efforts, it can be helpful to test the level of various hormones that can provide an insight into your fertility. The highest priorities to test are: 

• AMH 
• DHEA-S 
• Total testosterone 
• Progesterone (if trying to conceive naturally)”

This reinforces the key takeaway of using science to demystify fertility. Fett stresses that fertility decisions should begin with clear, measurable data rather than guesswork. Testing hormones like AMH or progesterone provides a concrete baseline, helping readers and clinicians identify which areas need support and avoid wasted time on generic or misaligned approaches.

“The practical impact of this controversy is that between 1981, when there was very good evidence of the protective effects of folic acid, and 1991, when a double-blind, placebo-controlled study finally satisfied the skeptics, 10 years passed, during which many women who should have been taking folic acid supplements were not, likely resulting in countless tragic outcomes that could have been prevented.”

This reflects the takeaway of empowering oneself through evidence-based self-care practices. Fett shows how delays in acting on credible research can have real human costs. The lesson is not to wait for consensus when strong evidence already points toward benefits. Readers are encouraged to recognize where science is clear enough to support immediate, practical steps, like taking folate early, rather than risking preventable harm.

“The role of energy supply does not end when an egg is fertilized— mitochondria from the egg also provides the fuel for a growing embryo. Problems with energy production in an egg can manifest later in embryo development because ATP is needed for all the work an embryo must do to grow and successfully implant. Dysfunctional mitochondria in eggs are thought to be especially problematic for early embryo survival.”

This illustrates the takeaway of understanding how lifestyle and biology intersect in conception. Fett highlights how mitochondrial health, shaped by age, nutrition, and oxidative stress, directly affects embryo viability. For readers, it reinforces the importance of habits and supplements that support cellular energy production since protecting egg mitochondria can influence not only fertilization but the embryo’s ability to develop and implant.

“CoQ10 can protect energy production in developing eggs, providing the fuel for chromosome processing and embryo development. This likely translates into fewer chromosomal abnormalities and embryos with a greater potential to develop into a healthy pregnancy.”

This connects to the takeaway of empowering oneself through evidence-based self-care practices. Fett points to CoQ10 as a supplement with scientific backing for supporting mitochondrial energy and reducing chromosomal errors. For readers, the implication is practical: Using targeted, research-based supplements like CoQ10 may strengthen reproductive outcomes.

“This oxidative damage is not limited to eggs from older women. Researchers have also found higher levels in women with unexplained infertility, recurrent miscarriage, preeclampsia, and endometriosis. For example, two studies found higher levels of oxidative damage in the follicles of women with endometriosis, and this was associated with a lower chance of an egg making it to the blastocyst stage.”

This challenges the widespread belief that egg quality problems are only tied to age, showing instead that oxidative damage also drives infertility in those with conditions such as recurrent pregnancy loss, endometriosis, and preeclampsia. By grounding this claim in clinical studies, Fett demonstrates the book’s central advice: use science to demystify fertility. Scientific evidence reframes infertility as more than just an age-related issue, pointing to biological processes that can be measured, understood, and potentially improved.

“In short, myo-inositol seems to improve egg development and embryo quality in women with PCOS, along with lowering insulin and improving blood sugar control. And it is not just women with poor insulin sensitivity who can benefit. A study conducted in Italy found that even in PCOS patients with a normal insulin response, myo-inositol treatment improved egg and embryo quality during IVF, likely because it also plays a role in the conversion of testosterone to estrogen.”

This illustrates the takeaway of understanding how lifestyle and biology intersect in conception. Fett highlights that PCOS management is not only about treating insulin resistance but also about addressing hormonal imbalances that affect egg quality. By citing clinical research from Italy, she shows that myo-inositol benefits extend beyond those with metabolic issues, supporting IVF outcomes even in those with normal insulin sensitivity. For readers, this underscores that targeted supplements can influence both metabolic and reproductive pathways, offering evidence-based options rather than one-size-fits-all assumptions.

“A lack of testing is problematic because when it comes to DHEA, more is not always better. If DHEA is either too low or too high, eggs are less likely to fertilize and less likely to develop into healthy embryos. One study elegantly revealed this “Goldilocks” effect by correcting both low and high DHEA levels to bring all patients into the normal range of 95—270 mcg/dL. Doing so significantly increased the number of eggs that fertilized and the pregnancy rate, for patients at both ends of the spectrum.”

This reflects the takeaway of tailoring medical knowledge to make informed and personalized decisions. Fett cautions that supplementation without proper lab testing can backfire since both deficiency and excess of some substances (such as DHEA) can impair fertility. The cited study’s “Goldilocks effect” reinforces that individualized dosing, guided by evidence and testing, improves outcomes more reliably than generic supplement use. For readers, it highlights the importance of precision and medical oversight in fertility care.

“Many commonly recommended fertility supplements are supported by little evidence of safety or efficacy, and they may in fact be counterproductive. The supplements to avoid or use with caution are resveratrol, turmeric, vitex, maca, pycnogenol, royal jelly, and high-dose L-arginine.”

This ties directly to the takeaway of empowering oneself through evidence-based self-care practices. Fett warns against assuming that “natural” equals safe, showing how popular but poorly researched supplements can undermine fertility rather than improve it. For readers, the lesson is that empowerment comes not from following trends but from critically weighing scientific evidence before adopting new treatments.

“Different supplements are stopped at different times. It is typical to stop DHEA when you begin medication for IVF or IUI and to stop alpha-lipoic acid, vitamin C, and N-acetylcysteine the day before egg retrieval or insemination. CoQ10, melatonin, and vitamin E can be continued until embryo transfer since they may help promote the development of the uterine lining. You can continue taking your prenatal multivitamin and vitamin D throughout your time trying to conceive and during pregnancy.”

This reiterates the key takeaway of tailoring medical knowledge to make informed and personalized decisions. Fett shows that supplement use should shift depending on the stage of treatment. For readers, the practical step is to bring this timing into conversations with their fertility doctor to ensure that their supplement plan aligns with clinical protocols and avoids unintended risks.

“One of the major factors that causes these higher-than-average blood sugar levels is the type of carbohydrates consumed. When you eat highly-processed carbohydrates made from refined flour, the starch molecules are easily accessible to digestive enzymes, so they can be broken down very quickly. This causes a massive spike in blood glucose levels.”

This ties to the takeaway of understanding how lifestyle and biology intersect in conception. Fett highlights how everyday dietary choices, like refined carbs, can directly disrupt blood sugar and in turn hormone balance and egg quality. For readers, the practical takeaway is that swapping out white bread or sugary cereals for slower-digesting foods such as oats or legumes can help create a more stable environment for fertility.

“The typical advice to avoid dairy while trying to conceive is often based on a concern that the hormones present in milk could compromise fertility. Yet the studies so far have not found a clear link. We know from the Nurses’ Health Study that a higher intake of full-fat dairy was actually associated with a lower risk of ovulation disorder. In a more recent study of IVF outcomes, women with the highest dairy intake had the highest chance of live birth.”

This reinforces the takeaway of using science to demystify fertility. Fett points out that cultural assumptions about dairy can mislead individuals into unnecessary restrictions, when large studies suggest potential benefits, especially with full-fat options. For readers, the lesson is that fertility guidance should rest on evidence rather than broad prohibitions and that including dairy may support, not hinder, reproductive outcomes.

“If you have a low sperm count, low morphology, or low motility, it is very likely you also have an unusually high level of oxidative damage, DNA fragmentation, or both. But a normal semen analysis does not rule out these issues. It is possible to have damage at the molecular level even if your semen analysis is normal.”

This connects to the takeaway of identifying and addressing environmental toxins as hidden barriers to reproductive health. Fett shows that sperm health cannot be fully understood from surface-level tests; deeper molecular issues like oxidative stress often go undetected. For couples, the insight is that a reassuring semen analysis may mask DNA-level vulnerabilities, so addressing lifestyle or environmental factors can still be crucial to improving outcomes.

“Factors such as exposure to common toxins, smoking, alcohol consumption, and a diet high in refined carbohydrates and saturated fat can compromise sperm quality at a molecular level. Reducing exposure to those chemicals, shifting toward a healthier diet, and increasing intake of antioxidants through food and supplements can protect developing sperm, potentially allowing you to conceive sooner and reducing the odds of miscarriage.”

This reflects the takeaway of empowering oneself through evidence-based self-care practices. Fett links everyday habits, such as diet, toxins, and lifestyle, to sperm DNA quality, showing how choices outside the clinic directly shape fertility outcomes. This reframes conception not just as a matter of medical treatment but as something readers can influence daily by limiting harmful exposures and prioritizing antioxidant-rich foods.

“Genetic testing of embryos can no doubt provide useful information for many couples, helping increase the odds of implantation and reduce the odds of miscarriage. But getting that information sometimes comes at the cost of losing embryos in the process. Like so many other choices, deciding whether to test your embryos and whether to transfer an embryo reported as abnormal involves weighing the pros and cons in relation to your unique circumstances and priorities.”

This highlights the takeaway of tailoring medical knowledge to make informed and personalized decisions. Fett emphasizes that while embryo testing can improve outcomes, it also carries trade-offs, such as the risk of losing viable embryos. Rather than prescribing a single “right” approach, she underscores that readers must evaluate the evidence and align choices with their medical history, values, and fertility goals.

“Six general categories of issues can cause implantation failure or recurrent pregnancy loss with a genetically normal embryo: hidden infections and chronic endometritis, endometriosis, immune factors, such as antiphospholipid antibodies and natural killer cells, hormone imbalances and genetic blood-clotting disorders, structural problems in the uterus, such as Asherman’s syndrome, and parental genetic issues, such as translocations.”

This connects to the takeaway of using science to demystify fertility. By breaking down implantation failure into six medical categories, Fett moves beyond vague notions of “bad luck” and reframes recurrent loss as something that can often be traced to identifiable and treatable conditions. For readers, the value lies in recognizing that persistent fertility struggles may reflect overlooked medical issues, pointing them toward targeted investigations.