Long sleep reflects fragmented sleep but it may also underpin diseases there may be some bias within that system because you may be sleeping long because of underlying disease. VO2 max muscle mass and strength are huge integrators of work, the differences between people who are high and low in those metrics dwarfs anything you see for nutrition and sleep. The difference is 5x which is a 400% difference in all-cause mortality astonishing if you talk about bottom quartile strength to top quartile strength it's a hazard ratio of almost three That's nearly 200% difference the same is true for muscle mass.

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