Do everyday chemicals and plastics affect fertility?

Emerging evidence Probably, a little. The honest summary is that the evidence is observational, the effects look modest, and the sensible response costs almost nothing.

What's actually been found

The EARTH study followed couples going through fertility treatment and measured chemicals in their urine rather than asking them to remember exposures. Women with higher phthalate levels had poorer IVF outcomes. In the same cohort, higher intake of fruit and vegetables carrying more pesticide residue was associated with worse treatment outcomes, including for male partners.

Nobody can randomize people to a low-chemical life, so this will never reach the evidence level of a drug trial. What we have is consistent direction, careful measurement, and biological plausibility.

Worth doing, because it's easy

• Don't heat food in plastic. Heat is what drives chemicals out of it. Glass or ceramic for the microwave, and don't put hot food into plastic containers.
• Swap the worst offenders for fragrance-free. "Fragrance" on a label can cover phthalates. Lotions and products that stay on your skin matter more than soap you rinse off.
• Wash produce, and buy organic selectively if budget allows — for the fruits and vegetables that consistently carry more residue. Eating more produce is still better than eating less, whatever it's grown in.
• Skip the receipts where you can — thermal paper is a real BPA exposure, and email receipts are free.
• Ventilate and dust. Household dust is a bigger route than people expect.

Not worth doing

• Insufficient evidence Testing your body for chemicals outside a real occupational exposure. The result won't change what you'd do.
• Insufficient evidence Detox protocols, cleanses and chelation. No evidence of fertility benefit, and chelation in particular carries real risk.
• Safety consideration Overheating. Worth a mention here because it's the one environmental exposure with a clearer signal: hot tubs and saunas affect sperm production, and overheating is best avoided in early pregnancy.

What to ask

"Is there anything in my job worth knowing about?" — hairdressing, nail salons, agriculture, cleaning, lab work, manufacturing and healthcare all have specific exposures worth a conversation.