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If swimming is such good exercise, how come whales are so fat?

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The first problem with this question is the presupposition that fat is unquestionably “bad”. Fat keeps us alive. We will normally get 60% of our calories from our fat when we're resting and fasted (post prandial, up to about 36 hours, then your body goes after protein and glucose stores primarily). read more

Swimming is exercise to us because we are so small compared to whales. Water currents and the atmosphere within water is an issue to us, but not to whales. They move through water so well that they actually get fatter the more they swim. read more

Jellyfish drift, whales swim. This is partially true but the main reason whales have a lot of blubber is a question of buoyancy. Fat is much less dense than muscle and bone and without it the whales would sink very fast. read more

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