Or, we could come back to our senses and do basic animal tests for long term deep space exposure. Like, start from a small rotating artificial gravity satellite with lab rats, and if you really have balls, send a couple of chimps to loop around the mars and come back.
We did that in early days no problem, and it retired a lot of early risks for humans.
Hey, we even had a grassroots program : http://en.wikipedia.org/wiki/M... - got no real support or funding by NASA.
In fact its super lame that we only have data points for humans spending time in microgravity and 1g, but nothing in between. So we have no curve to fit to partial or reduced gravity effects on health. After decades of multibillion dollar manned spaceflight investments, thats pathetic. The fact that we dont have a biological lab sitting outside of van Allen belts right now testing different radiation shielding approaches on rats is also pathetic.