I've Joined My Fitness Pal... again

A little while ago I joined My Fitness Pal, then deleted my account because I just didn't keep it up. For those who aren't familiar with MFP, it's an online food and exercise tracker. You enter your details - height, weight, measurements - and what you want to lose, as well as how active you are day-to-day. It calculates your daily calorie limit, although you can increase your limit depending on how many calories you burn during exercise. Then, you enter all the food you've eaten that day - there's a huge database of foods, although you can add your own recipes etc.
I've decided to rejoin, to see how effective it is at helping me lose 7lbs (half a stone). I'm hoping that the slight weight loss of 1/2lb each week will be fat from my muffin top dropping off, although I won't know until the end of March (my next scheduled body fat check).
I've kept a food diary on and off for years, but feel that My Fitness Pal is a more environmentally friendly way of keeping track (just call me the paper saver). It's become common knowledge that keeping a food diary can aid weight loss, but I'll be interested to see if it makes me more obsessed about what I eat.
Today has been a good day because I had a wisdom tooth out, so eating anything solid has been impossible past 1.30. That said, I'm slightly over my sugar limit, due to the baked beans I ate before my operation, the tomato soup after, and the ice cream my dad bought me to make me feel better (thanks Daddy Martins). Hopefully I'll be under tomorrow!