The first time I went through this, I was a faithful Fitday user for the first several months. It was incredibly helpful. But then I found myself unwilling to eat anything unless it was super low calorie, even though I then had a hard time eating enough calories. It was really messing with my mind, so I quit, and continued to be successful. I also was able to lose a substantial amount of weight (from 170 to 130) and keep it off for a few years (prior to pregnancy) by following a low-fat regimen. I don't want to go that way again, especially because I am horrified now by how much sugar I consumed.
I know weight loss can be done without counting calories, but I am experiencing a stall right now. I know there are a million things that could be causing it, so I am not panicked, but it would help soothe my mental issues to hear that others are losing weight without counting calories (and the insanity and obsessiveness that haunts me when I do it).