It's way harder to eat a lot of whole fruits though. 1 gala apple is 80 calories, you need something like 25 apples to fulfill the calories of the day without getting fat. That's a lot of apples and the glucose + fructose + fiber combo triggers your brain in feeling satiated for a good chunk of time (2 hours roughly), with just 1 apple.

Granted that this is all extremely specific to an individual, I can easily eat 2 cheeseburgers in a meal and just feel full, or 2 apples and feel full, 2000 vs 160 calories!