I don't watch Today much, so i don't know who this Joy is or if her SOS diet is a regular thing.
But she just said that if you buy a latte in the morning and only drink half, then you should throw is away and buy another rather than reheating it for the afternoon latte fix.
Something about the bacteria thriving between 40 and 140 degrees, which is where the coffee will settle when it cool downs.
Of course it's gross to let milk sit at room temperature all day and then drink it. Since when is this news?
Is it gross to reheat black coffee?
I can see it being bad to let milk sit out all day. I wonder if that same logic follows if you drink half, then save it in the fridge for the rest of the day.