Sugar has been my last frontier since 1996 when I became a vegetarian, giving up all meat and coffee as well. (I had given up cigarettes in 1981.) I said in 1996 that I was giving up sugar, but show me an enticing dessert when I'm out in public and I've never been able to resist it. It's not that I don't know its effects, including short term energy surges, but it's that I give myself the "well, just this once" pass every time.
So for this flu season, particularly this H1N1 season, sugar is going to become the one thing I can change, at least in its most obvious manifestations as candy, dessert, or breakfast ingestions. Making this change saves me money, and boosts my immune system. I'm less concerned about losing the weight, though I would guess that will happen, as I am about long term consequences for my health. The list of what I have given up, though impressive, will not include either my sense of humor or Irish whiskey. Not now, not ever.