It’s because [temperature affects how you taste certain flavors.](https://misscoffeebreak.wordpress.com/2018/05/31/taste-and-temperature-taste-and-flavour/) Your ability to taste sweetness increases at the temperature increases, which is why room temperature soda tastes so much sweeter compared to cold soda even though the sugar content is unchanged. Similar with ice cream – melted ice cream tastes a lot sweeter compared to cold ice cream. You’ll find that even nondairy milks like oat and soy taste sweeter when steamed for lattes even though they don’t contain lactose and just plain sugar.
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