Dr Cox: You see those bell peppers that you're munching? They aren't going to do a truckload of jack against the cancer raging inside of your body.
Source: Scrubs 706
Background:A cancer patient kept munching bell peppers and looking up cancer information on Wikipedia on his laptop when Dr Cox was examining him. Dr Cox'd had enough of all this. He took away his laptop and set him straight.
Hi, I'd like to know the meaning of jack. I remember "jacked on" means "enhanced" in "The person is jacked on the quality chemicals". But I don't see this meaning fits in this sentence. And none of the definitions on the WR dictionary seem to work here. If I have to guess, it simply means "things"/ "stuff".