A Waste Of Space, Scientific American
"More likely, Kelly's and Kornienko's tests will just confirm in greater detail what we already know from several previous long-duration missions: Our current space habitats are not adequate for voyages to other worlds. The lack of money to build these habitats, more than any lack of medical knowledge, is what keeps humans from Mars and other off-world destinations. ... It would be unfair to blame NASA alone for this shortsightedness. Integrating artificial gravity and better propulsion into its human spaceflight program would require many billions of dollars, and that money is not forthcoming from Congress. So NASA has struck a pragmatic course, tinkering with well-worn technologies instead of spending the financial and political capital to develop new ones."
Keith's note: Will NASA learn anything from the one year space twins study? Yes, of course they will. Will this knowledge help us "go to Mars"? (gotta use that phrase once a day, right NASA?). Who knows. Not likely. The studies are superficial and scattered in their focus. As this article notes NASA will, at best, simply understand their collective lack of capability to semi-safely send humans to Mars slightly better. Meanwhile, NASA will still kick the can down the road to Mars (I used the Mars meme twice, NASA!). NASA does not have the money or the scientific strategy to actually answer the questions it needs to answer. So they grab everything they can slap a Mars label on it and proclaim progress on the road to Mars (three times!).
As was the case with John Glenn's mission to solve aging problems in space we will never see the results of this research - in any form - that NASA uses to justify the hype surrounding this otherwise ho hum stay aboard ISS. And we will still be in Earth - not Mars - orbit. And the news media will still be confused which twin has the moustache.
The ISS still has an amazing untapped potential to actually address these very real issues of human physiology and long duration spaceflight with direct applicability to Mars. But NASA is simply not up to the task of using these resources in a concerted, strategic, long-term fashion - and assembling the resources to do so. They just make it up as they go. And their poorly equipped junior partner CASIS is simply clueless.