Take some time and compare the release footage to the various videos shot of him while in captivity, you will see he is very gaunt in each one of them.
In any case, the exchange deal was being worked on for months and just like the Soviets did with their prisoners, the Afghans made sure Bowe Bergdahl did not appear mistreated in front of the cameras. After all, this is a propaganda film we are watching, not just some news reel.
The guy went looking for the Taliban. Everyone agrees with that.