I just remind myself of the bigger picture. Yesterday I was on the treadmill, and I was struggling with the last 5 minutes of the run. So, I thought back to my friend who ran an entire marathon, and realized that five minutes was nothing, and I could do it. That, and I try to fast-forward. Sure, I may enjoy whatever glass(es) of wine today, but in a year, if all that extra wine has packed on the pounds, I really wouldn't enjoy it.
That, and I flat out won't buy bigger clothing.