Polycarbonate plastic contains bisphenol-A (BPA), a synthetic estrogen that leaches into food and beverages — especially when the container is heated, scratched, or washed repeatedly. Studies have linked BPA exposure to hormonal disruption, developmental issues in children, and increased cancer risk. Even 'low-dose' exposure from polycarbonate containers used daily adds up over time.
Borosilicate glass is chemically inert. It contains no BPA, phthalates, or synthetic additives, and nothing migrates into your food regardless of temperature, acidity, or repeated dishwasher cycles. It handles thermal shock well — safe for the oven, microwave, freezer, and dishwasher without degrading.
The recommendation is clear: switch to borosilicate glass. It is heavier and breakable, but the complete absence of leaching chemicals makes it the gold standard for food storage. If you store hot leftovers, acidic foods like tomato sauce, or anything for children, glass is the only container material worth using.