Do you mean if humans did not have a stomach
at all or if your stomach were removed? We can
learn the answer to the first question by
answering the second one.
Your stomach helps you break down food
mechanically (by squishing it) and dissolving it
(by releasing acid). However, your intestines
do most of the work absorbing liquid and nutrients
from what you eat. This is why you can easily
survive without your stomach. Some people choose
to have all or part of their stomach removed for
health reasons (called gastric bypass surgery).
However, they do need to change what and how they
eat to make up for not having a stomach.
Without a stomach to store eaten food, they
may need to eat smaller meals but eat more often.
They also need to break up their food in small
pieces when eating or avoid food that is difficult
to digest, like meats and other proteins.
So what if humans never evolved to have
stomachs in the first place? Biologically,
we’d be very similar to how we are now. We
couldn’t eat as many types of food as we do now
and we’d have to be more careful about what we
eat. We might need to spend more time finding and
preparing food. What do you think? How would
your life be different if you took twice as long
to find and eat food?
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