AONT (All Or Nothing Thinking) is bad. Don't do it!
I've fallen into that trap before and it is a very destructive on. What's past is past--forget about it and pick up where you left off. One meal or one bad day won't derail you. Averages are what we're interested in since this is a long term thing.
My advice is to make sure you log every single calorie--good, bad or ugly--if you eat a dozen donuts (and I HAVE, in the past) log 'em. If you drink a gallon and a half of beer (done that too), log it. That way you can see how small an impact one slip-up makes on your average.
47 M 5'8"
May 4, 2010...... 440? lbs. (Start FitDay Size 60 Jeans)
June 19, 2010.... 393 lbs. (First Weigh-in)
June 19, 2011.... 229 lbs. (164 lbs. gone in one year :-)
Current Weight... 185 lbs. (Size 36 Jeans)
Next Goal 169 lbs. (07/04/12)
Ultimate Goal 165 lbs. (12/31/12)
The best exercises for weight loss are Fork Putdowns and Table Pushaways.