That people take meals irregularly may get gastralgia, but why animals are not?

Question

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Answer 1

We all have evolved to fit different niches in the ecosystem. Some animals need to eat every few hours, others eat only every few days, others are opportunity feeders that eat whenever they get the chance, whether it be hours or days. Animals and people are different as far as their digestive rates and requirements.

Answer 2

Because animals are animals and people are people.
Animals have a different digestive system than humans.