It’s actually for an evolution a reason. The molecule that commonly makes things sweet is sucrose. Sucrose is a very calorie dense molecule. Eating a small amount of something with sucrose in it gives us the same amount of energy as eating a larger volume of something without it. So in a food unstable environment of our ancestors, where you never knew when or where your next meal would come, sucrose ensured that you got as much energy as possible. Thus human ancestors who ate and enjoyed sweet things had a better chance of survival.
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