Is phthalates in food packaging safe during pregnancy?

What does the evidence say about phthalates in food packaging during pregnancy?

1. Phthalates are used in personal care products, solvents, detergents, and food packaging, and they can shed from wrapping, packaging, and the plastic gloves worn by food handlers into food itself. 1
2. Pooling 16 US cohorts covering 6,045 pregnant women who delivered between 1983 and 2018, phthalate metabolites were detected in more than 96 percent of urine samples, and exposure to four of the 11 phthalates measured was associated with a 14 to 16 percent greater probability of preterm birth. 1
3. Statistical models simulating reduced exposure found that cutting the mixture of phthalate metabolite levels by 50 percent could lower preterm births by 12 percent on average, and researchers named eating fresh home-cooked food, avoiding processed food in plastic containers or wrapping, and choosing fragrance-free or phthalate-free products as steps that may reduce exposure. 1
4. Phthalates are classed among endocrine-disrupting chemicals, which NIEHS notes cannot be completely avoided or removed, though informed choices can reduce exposure, and even low doses may matter because normal hormone signalling operates on very small changes. 2
5. Heat drives migration out of packaging: in testing of plastic containers used in microwave operations, dibutylphthalate migrated into food simulants at up to 7.5 micrograms per litre, with migration rising as temperature increased and as containers accumulated prolonged use. 3

Is phthalates in food packaging safe in each trimester?

• First trimester. Phthalate metabolites turned up in more than 96 percent of urine samples from over 6,000 pregnant women, so this is background exposure rather than a rare accident. Nothing about the first trimester calls for alarm; it is simply the easiest time to change habits that will last the whole pregnancy.
• Second trimester. The food side is the tractable side. Phthalates shed from wrapping, packaging, and even the plastic gloves worn by food handlers, which is why ultra-processed and fast food track with higher measured levels. Cooking at home shifts the average more reliably than swapping any single product.
• Third trimester. Because the outcome in the research is preterm birth, the third trimester is when it matters most in practice. Researchers estimated that halving phthalate metabolite levels across a population could reduce preterm births by about 12 percent, which is a population figure rather than a personal guarantee.