"An experiment that sent mice into space onboard the shuttle Atlantis has provided some new insight. The results are a little unsettling: After just two weeks in space, the mice showed signs of nonalcoholic fatty liver disease, or NAFLD, and early indicators for the beginnings of fibrosis. NAFLD can lead to fibrosis, the same kind of problem that can develop in people who abuse alcohol."
https://mic.com/articles/141861/scientists-are-discovering-more-horrible-things-space-can-do-to-your-body?utm_source=dailydot&utm_medium=social&utm_campaign=partner#.5ubIcMlih