I'm not necessarily giving anything up totally, as much as putting in an effort to cut back on a couple sinful habits.
Swearing - I have more of a potty mouth than I care to admit, so I'm making a point to cut back on that. I don't expect to be perfect right away, and thus far haven't gone a day without using some kind of vulgarity, but the point is to gradually kick the habit.
Over-eating - Well, if putting on 40 pounds is indicative of anything! I'm making a point to eat smaller portions, and not snack so frequently between meals. So far, this has been easier than not swearing.