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A 28-year-old female asked:

Does a "fast metabolism" and natural thinness mean a shorter life span (according to studies it makes your body work harder and tire) true? :(

1 doctor answer1 doctor weighed in
Dr. Derrick Lonsdale
Preventive Medicine 74 years experience
Probably: Animals like the sloth have a longer lifespan than others with a faster metabolism. This may correlate with the sleep profile. Under 6 hours and over 8 hours gives a shorter lifespan than between those figures. I think that this means that a median is right for everything--- yin and yang.

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Last updated Aug 24, 2018

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