Eli5: When humans get too fat or obese there is a high risk of heart related issues. But in nature for example Walrus is or hippos are so fat in shape almost their body is consists of fat and are they same sick like humans?
They are designed to be like that, so they have the metabolism and supporting organs adapted to that body. Humans are not designed to be obese, so for us, it is a hindrance and stresses our bodies in a number of ways.
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