Is it safe to drink hot chocolate from a styrofoam cup?
Avoid it when you can. Hot, fatty drinks are not a good match for polystyrene foam, and glass or ceramic cups are easy swaps.
What's actually in it
Styrofoam cups are expanded polystyrene foam. Hot chocolate is hot and usually contains milk fat. That combination matters because heat, fat, and contact time can affect migration from polystyrene food-contact materials.
This is not about panic over one cup at a winter event. It is about choosing better materials for repeated hot drinks, especially for kids.
What the research says
A 1998 Food Additives and Contaminants study monitored styrene migration from polystyrene cups and containers into foods and drinks, including hot chocolate. It found migration depended strongly on fat content and storage temperature.
A 2021 Foods study found fat content and higher testing temperatures significantly increased styrene migration from polystyrene food-contact materials into food simulants.
Practical takeaway: use a ceramic, glass, or stainless cup for hot chocolate. If a cafe only has foam, transfer the drink when you can and do not microwave the foam cup.
The research at a glance
What to use instead
For hot chocolate, shop glass or stoneware cups instead of using foam cups for repeated hot drinks.
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