I'm 28, almost 29, so I hope you don't mind me jumping in.
I've given up Oreo cookies, McDonald's, chips, Starbucks, video games (except for a couple of puzzle games on the computer), Buffalo Wild Wings, almost everything fried... and a lot of other things. I don't mind it either. It was stuff I didn't particularly enjoy anyway, or they were things I'd totally GORGE myself on, like the Oreos. I could sit and eat half the bag, easily.
What I flat. out. REFUSE to give up is my 5 Guys. 5 Guys Burgers and Fries are delicious. I stick to 1 small cheeseburger w/ mayo, tomato, lettuce and pickles and a few fries. I get them about once a month.