Stomach feeling full based on calorie intake
In the world I am building I wanted to design a race on a planet which get more full the more calories they eat and then stopping when they have had their daily caloric requirement. I have an idea's on how they would do it physically (sample parts of the food going down their esophagus equivalent and estimating on the amount going to the stomach).
The problem I have is why this race would create this evolutionary tactic in their hunter/gatherer phase. If you find a bunch of berries you would eat as many as you can fit in the stomach, store excess calories as fat, and take the rest back to village for later.
I usually try to find a corollary examples for races I make from earth and I try to be at least a semi-hard on science as to why races are the way they are.
Any ideas would be nice.
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