The idea that some people are born with a fast metabolism is wrong, he says. The real clues can be gleaned from how do we actually live, even when we're not old, but as we get older, what changes, right? If anything, like how are we hardwired? So this study dove right into that for metabolism. They took 6,000 people across the human lifespan. And when they got the results of what the metabolism was of this group of people, 6,000 across 20 countries, guess what they found? It was all over the map, just like you'd expect.

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