After more than 50 years of human spaceflight, researchers know some of the risks posed to the human body in zero gravity.
"Our bodies love force," said John DeWitt, senior biochemist who works as a contractor for NASA and focuses on crew health."Force is what helps our muscles get stronger; force is what helps our bones to stay strong; force is what helps or heart to stay strong by having to pump the blood against gravity. So, when you take that force away, you all of a sudden lose a really important stimulus that's important for health.
Scott Kelly and other astronauts in their late 40s and 50s have also complained about their vision being slightly altered. Some have required glasses in flight. But a new study published in the Frontiers in Physiology suggests that resveratrol, an antioxidant and compound found in blueberries and the skin of grapes, could be part of the dietary strategy that keeps astronauts strong on Mars. Once they arrive on the Red Planet, astronauts will be dealing with much less gravity than what they're used to: about 40% of Earth's gravity.
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