I remember reading about his in Harry Eisenberg's book about what happened. Apparently, this guy was on a liquid diet to lose some weight so he would look good on TV. He dropped about 100 pounds in short order, and his body hadn't really had a chance to recover. Interestingly enough, he was actually lucky to have fainted where he did, since back then, Jeopardy! taped at the same complex as the California Big Spin, which by law required a EMT unit on hand in case someone had a heart attack or some such. Also, one of his opponents was an RN.