Last night the guy that made my subway sub said he ate 20,000 cal. a day. I gave him 3 or 4 outs on it being a mistake thinking he ment 2,000. He explained to me that he has had extensive leg, and joint surgeries so he exercised a lot, running 16 miles a day. I can see him needing more calories a day, but 10x more. I'm asking if there is any validity to this?