An interesting article on The Guardian:
Unlike what the title might suggest, scientists do not propose to put astronauts into hibernation, a common trope in science fiction (sleeper ships are a particular example). Instead the article focuses on the issue of bone degeneration and what we can learn from bears in dealing with bone degeneration as result of low gravity.
Another interesting article:
Over-fishing is a great problem and modifying plants to produce “fish oil” is an interesting alternative.