Did you ever get a hot food take out served in a styrofoam container with no liner such that the food melts the styrofoam leaving a hole in the container with a yellowish border around the hole?  When that happens, I refuse to eat the food, I return the item, ask for my money back, and vow to never visit that particular restaurant or establishment again.

One source of information I found said this:

Polystyrene contains the toxic substances Styrene and Benzene, suspected carcinogens and neurotoxins that are hazardous to humans. Hot foods and liquids actually start a partial breakdown of the Styrofoam, causing some toxins to be absorbed into our bloodstream and tissue.

Polystyrene food containers leach the toxin Styrene when they come into contact with warm food or drink, alcohol, oils and acidic foods causing human contamination and pose a health risk to people.  Avoid drinking tea with lemon, coffee with dairy cream, fruit juices, alcoholic beverages and wine from Styrofoam cups. Red wine will instantly dissolve the Styrene monomer.  Do not eat oily foods from Styrofoam containers.

Most interesting is the degradation of food that contains vitamin A (beta-carotene). In packaged foods with the addition of heat (such as microwave temperatures), vitamin A will decompose and produce m-xylene, toluene, and 2,6-dimethylnaphthalene. Toluene will aggressively dissolve polystyrene. This renders polystyrene as an unsuitable package for containing or micro waving products that contain vitamin A.

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