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Astronauts who return from space show stiffer arteries and insulin resistance, conditions that mimic a fast-forward version of age-related health problems here on Earth.
Researchers are monitoring how weightlessness affects astronauts in real time using ultrasound measurements one month and then five months into the flight.
So far, they’ve learned some of the ways the body responds to zero gravity. Since it doesn’t have to work as hard, it weakens.