Cutting plastics: simple swaps against endocrine disruptors

The simplest defense against hormone-disrupting chemicals is a handful of cheap swaps: skip fragrance, stop heating food in plastic, drink from glass, steel or ceramic, avoid can linings and non-stick pans, and buy food loose or in bulk. Four experts name the same culprits, phthalates, bisphenols such as BPA and BPS, and the tiny plastic particles that carry them, and say they reach us mostly through food, drink, packaging, cookware and scented products.

Shanna Swan, a reproductive epidemiologist, makes the firmest case. In her studies, mothers with higher levels of certain phthalates in early pregnancy had sons who were less completely masculinized, a result she replicated in a second study. Her analysis of 61 studies found that sperm counts fell by about half in 50 years, too fast for genetics. Phthalates and bisphenols leave the body within hours once exposure stops, so swaps work quickly. But exposure before birth cannot be undone. In her words, "Whatever happened in the womb stays in the womb." Her list: avoid fragrance, plastic storage, cans and non-stick pans, never microwave plastic, and do not trust BPA-free labels, since the substitutes may be as harmful. She found loose lettuce cheaper than wrapped.

Andrew Huberman focuses on the particles. He says micro- and nanoplastics have been found in the brain, testes, ovarian follicles and placenta. His avoidable sources are plastic water bottles, sea salt, canned soup, microwaved plastic and hot drinks in paper cups. He recommends a reverse osmosis filter, cast iron or ceramic pans, and declining paper receipts. He is careful about the limits: there are still no causal human data linking microplastics to specific diseases.

Fertility specialist Natalie Crawford adds children. She says scented oils such as lavender and tea tree can have estrogen-like effects and recommends unscented products, especially for the young. She says a baby's future egg supply appears most sensitive to the mother's exposures during pregnancy.

Physician-scientist William Li says of bottled water, "The water isn't the problem. It's the bottle." He tells people to replace plastic storage with glass or ceramic. He also admits he does not know enough to say microplastics disrupt hormones. His concern is blood vessels.

They agree on food and drink as the main route and on pregnancy as the time to take this most seriously. They differ on confidence. The hormone evidence is strongest for the chemical additives and weaker for the particles themselves. They also differ on canned food, which Li values for nutrition, and on how strictly to buy organic.

The article sets limits. Individual swaps reduce exposure but cannot remove it, and at some point worry stops helping. If you are pregnant, trying to conceive or worried about hormone symptoms, talk with an obstetrician, urologist or reproductive endocrinologist. These swaps support medical care and do not replace it.

What to do with it: go fragrance-free first. Never heat food or drinks in plastic. Change your drinking vessels and food storage. Cut canned food, especially fatty and acidic kinds. Replace non-stick pans. Buy loose and in bulk. If you are planning a pregnancy, start at least 90 days ahead.