The aluminium foil that’s used to wrap chocolates will react with the hydrochloric acid in the stomach to some extent, but this isn’t a serious cause for concern. Even if all the aluminium in a typical chocolate wrapper spent long enough in the stomach to completely react, it would still give you less than 2 per cent of the acute toxic dose of aluminium chloride. That’s the worst-case scenario, though – scrunched balls of foil typically pass all the way through, largely undigested.

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luis villazon
Luis VillazonQ&A expert

Luis trained as a zoologist, but now works as a science and technology educator. In his spare time he builds 3D-printed robots, in the hope that he will be spared when the revolution inevitably comes.

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