Gaining

It’s probably doable for a day or two, but I really doubt it’s sustainable for a month. Not to mention, your body is probably only absorbing a portion of those calories. After a certain amount you start to hit diminishing returns.

I can't imagine how that'd be fun after awhile. Seems kind of....mechanical.

Did the body can adjust to such amount of calories, how can you do it on regular basis, I mean it's must be very hard in the beginning.