considering they sell beef jerkey ,egg whites, pancake mix ect.... he's basically eating what the avg amercian consumes on a daily basis.
Agreed.
Even living on protein shakes and gainers won't be that hard.
He can get vitamins as well, they probably sell fish oil caps, omega 6 and MCT oil as well, so he will get his fats as well.
A whey shake with some additional fatty acids is ok. The sweeteners and other stuff won't kill him in 27 days.
And, he won't get fat because he can order fat burners as well.
I think it's a funny idea and if he gets sponsored, he should go for it.