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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