After eating a stomach-full how can we eat again after a while without having any bowel movements?

We are a very outdated model of human being.  The last meaningful evolution of our species occurred tens of thousands of years ago when we were hunter gathers who spent a ton of calories during our daily struggle/search for food.
Your food travels through an upper and lower intestine, and finally your bowels before being expelled.  The “am I hungry?” sensors are located in the early parts of that system, because again, life was a constant struggle to find enough food, so we had to ensure a constant stream of incoming nutrition.  
Your lower intestine/bowel may be full, but if your stomach is empty you’re body is signally that you need to add more food to avoid breaking the chain of incoming nutrition.

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