How are animals that eat only one kind of food not horribly malnourished? Do they need a narrower set of nutrients than humans?
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It’s nature. If you eat the thing no one else wants then you can eat as much as you want. For example pandas and koalas.
They eat food nothing else eats, but it isn’t very nutritious, so they have to always be eating. Which is fairly common for plant eaters.
And they do have health problems, it makes it hard to have babies for pandas. And unhealthy things in koalas relating to similar organs.
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