Thanks for all the support, it has helped me put yesterday into its proper perspective.

As for counting calories ... I don't count them to keep them low ... I average about 2100/day (much more than 10X my body weight), but I exercise 6 days/week for at least an hour, so I'm burning up about 2700 cals/day. I track the cals to make sure that I don't have a deficit of more than 1000 cals. Even yesterday, I burned off about 300 more cals than I ate. I am much more concerned about tracking carbs than cals ... it's just that with fitday, you can't track one without the other