How we can help restore optimal hormonal function in the next generation.
Over the past several decades, researchers have documented troubling changes in male reproductive health. These include declining sperm counts, reduced sperm quality, increasing rates of genital developmental abnormalities, and a rise in certain hormone-related cancers, such as testicular cancer. While genetics alone cannot explain how quickly these trends have emerged, growing evidence points to a significant environmental contributor: endocrine-disrupting chemicals (EDCs).
What are endocrine disruptors?
Endocrine disruptors are substances that interfere with the body’s hormonal systems. Hormones act as chemical messengers that regulate growth, development, metabolism, reproduction, and immune function. Even small disruptions during critical windows of development can have lifelong consequences.
EDCs can:
- Mimic natural hormones and overstimulate receptors
- Block hormone receptors, preventing normal signaling
- Alter hormone production, transport, metabolism, or elimination
Unlike traditional toxins, endocrine disruptors do not need to be present at high doses to cause effects. In fact, low-dose, chronic exposure appears to be especially relevant, particularly during fetal development and early life.
Common sources of exposure:
- The modern environment contains thousands of chemicals capable of disrupting endocrine function. Some of the most well-studied include:
- Bisphenol A (BPA) and related compounds used in plastics, food packaging, and thermal receipts
- Phthalates, commonly found in plastics, fragrances, personal care products (shampoos), and medical devices
- Pesticides and herbicides, used in conventional agriculture
- Persistent organic pollutants such as PCBs and dioxins, which remain in the environment and accumulate in body fat
Because these chemicals are widespread, exposure often begins before birth and continues throughout life.
Effects on male reproductive development:
One of the key insights from the research is that male reproductive development is highly sensitive to hormonal disruption during fetal life. Testosterone and other androgens play a central role in the normal formation of the testes and male reproductive tract.
Exposure to endocrine disruptors during pregnancy has been associated with:
- Cryptorchidism (undescended testicles)
- Hypospadias (abnormal positioning of the urethral opening)
- Altered testicular development and function
These conditions are thought to reflect impaired androgen signaling during early development, a concept often described as part of a broader “testicular dysgenesis syndrome.”
Interestingly, zinc appears to offer protective benefits against these adverse effects. Zinc is a trace mineral that plays multiple roles in male reproductive biology (supports testicular development and testosterone synthesis, stabilizes sperm structure, and protects cells from oxidative damage).
Studies show that zinc supplementation can ameliorate many of the negative changes caused by BPA, improving sperm quality and helping restore testosterone levels compared with exposures without zinc support. It counteracts specific toxicants, so adequate zinc status is broadly associated with better testicular function, higher testosterone levels, and improved sperm parameters such as motility and morphology. (PMID: 37682394)
Practical ways to promote healthy zinc status in kids and teens:
- Prioritize zinc-rich foods. Excellent dietary sources of zinc include:
- Red meat and lamb
- Oysters and other shellfish
- Dairy products, such as milk and cheese
- Eggs
- Be mindful of zinc antagonists. High intakes of phytic acid (found in large amounts in unsoaked grains, legumes, and nuts) can reduce zinc absorption. Proper food preparation methods like soaking, fermenting, or cooking can help improve mineral availability.
- Consider zinc supplementation when appropriate. In children with early puberty, frequent infections, poor appetite, or known environmental exposures, zinc supplementation may be worth discussing with a healthcare provider. Dosing should always be age-appropriate and individualized, as excessive zinc can interfere with copper balance.
- Provide synergistic nutrients. Zinc works alongside nutrients like vitamin A, vitamin B6, magnesium, and selenium, all of which support endocrine and metabolic health. A nutrient-dense diet often provides these cofactors naturally.
Other effective antioxidants: Vitamins C and E are two of the most important antioxidant vitamins for male reproductive health.
- Vitamin E is a fat-soluble antioxidant that protects sperm membranes from oxidative damage and supports the function of Sertoli cells and developing sperm cells.
- Vitamin C, a water-soluble antioxidant, plays a complementary role by supporting spermatogenesis and testosterone production.
- Selenium is another critical mineral for antioxidant defense and male fertility. It supports the activity of key antioxidant systems, protects vitamins C and E from oxidative depletion, and plays an essential role in thyroid hormone metabolism—a system closely tied to reproductive health. Selenium levels are consistently higher in fertile men compared to infertile men, and higher seminal selenium concentrations are associated with improved sperm motility. Studies show that selenium supplementation, particularly when combined with vitamin E, can reduce markers of oxidative damage, protect sperm DNA, and improve sperm count, motility, and viability. Selenium deficiency, on the other hand, has been linked to damage of the seminiferous tubules and impaired sperm production.
Deficiencies have been shown to increase testicular oxidative stress, disrupt sperm development, and lower testosterone levels. In contrast, adequate intake of vitamins C and E has been shown to improve sperm production and protect testicular tissue against oxidative damage caused by toxins such as heavy metals, pesticides, alcohol, and environmental pollutants.
Practical tips for parents:
- Promote a Healthy Metabolism: Provide nutrient-dense foods, adequate protein, and healthy saturated fats (butter, coconut oil, eggs) to help the body regulate energy and hormones.
- Limit Hormone-Disrupting Exposures: Reduce contact with plastics, canned foods, pesticides, and other chemicals that can act like estrogens in the body. Opt for glass or stainless steel containers and organic produce when possible.
- Balance Thyroid and Hormonal Health: Ensure adequate intake of iodine, selenium, zinc, and B vitamins through diet or supplements as recommended by a healthcare provider. These nutrients support thyroid and overall endocrine function. Dr. Broda Barnes has helpful guidelines on how to monitor thyroid function.
- Encourage Physical Activity: Regular movement helps regulate metabolism, insulin sensitivity, and healthy hormone signaling.
Supporting nutrition, reducing exposures where possible, and protecting metabolic health are essential if we want to preserve male health, fertility, and resilience for future generations.