system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do all kids around the world like sugary food (like candy, chocolate, sugary drinks, etc.) more than anything else, and when reaching adulthood, most don't get obsessed with it that much?

Even if they're not hungry, they would eat candy at any time  
Also, how much is too much for children?
gpt
Evolution and experience.

Sugary foods are loaded with energy.

Most of our existence, we could not get enough food, so when we found something like berries, loaded with energy, it was beneficial to eat them as much as possible. So we evolved to crave those kind of foods.

Now that we have a surplus of food, we don't need to eat as much, but we are still wired to crave it.

As for why kids over do it with candy, that's personal experience. Eating too much sugar at once has negative effects on our body, which we don't really recognize until later in life. 

There's also a bit of rebellious nature at play. Parents tell their kids don't eat all that candy. So the kids do. When the kids become parents, they see how foolish that was.