I gave up sugar for Lent one year. I actually love Lent for the 40 days of discipline it offers.. I always use it in almost a secular way to challenge myself in one way or another. So, I gave up sugar (and sugar substitutes) completely. The ONLY permanent outcome of that exercise was that I never, ever, could to back to putting sugar in coffee, and that definitely means no sugar, no Equal, no Stevia, no sweetener. After 40 days, sugar in coffee became gagworthy.
But don't ask me to give up my half-and-half!