Yesterday I was eating pizza (my favorite food) and when I was getting to the last pieces I felt like if I ate just one more bite of pizza, I was going to throw up.
However, I was able to eat a dessert without problems (a large bowl of cereal with milk).
If my stomach wasn’t really full, why couldn’t I keep eating pizza without throwing up?
In: Biology
Before agriculture and civilization and… modern humans, basically, sweet food was a very rare and wonderful thing to find. We spent most of our time eating vegetable matter, roots, meat, etc. that are nutritious but often not that calorie dense. (Seriously, diets like “Whole30” mostly help you loose weight because it’s hard to eat enough calories in carrots and lettuce to maintain your body weight.)
So on the rare occasion we came across a tree laden with fruit, you wanted to eat as much as possible and put it away as fat for later. You couldn’t say “Mmm, yes, thousands of calories of apples, but… I did just eat a big root and I’m pretty full…”
Pizza (while dangerously good at appealing to our appetite) is still basically in the generic food category. But dessert is that rare sugar hit your brain is programmed to take full advantage of.
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