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    What do you mean by "unsafe"? Food poisoning? Cause a hot coffee explosion? Something else? Commented Oct 17, 2021 at 0:27
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    "Someone" is pranking you, I think. Commented Oct 17, 2021 at 17:53
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    @FuzzyChef The most likely result I could come across was the fact that some people have more trouble digesting milk, and mixing it with coffee makes it even heavier on the stomach, although for many others (like myself) it's not a problem. Commented Oct 17, 2021 at 20:18
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    @Clockwork There is no plausible mechanism for that which would be potentiated by adding cold milk to hot coffee. Commented Oct 18, 2021 at 18:13
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    @FuzzyChef I assume OP means "unsafe" in the realm of a TCS food (Time/Temperature Controlled Safety) of which milk definitely is one. Putting cold milk into hot coffee would raise the temperature of the milk into the danger zone and plausibly, if left there long enough then bacteria could grow. But what must be remembered is that the safety of TCS foods depends on both time and temperature, so pouring cold milk into hot coffee should be safe as long as you drink it in a reasonable time. Commented Oct 18, 2021 at 22:51