Ladies, I have discovered the most amazing website (probably better for those of us with iPhones or androids, but blackberry app coming soon!) called myfitnesspal.com.
It's like a food and exercise diary, but it takes into account your height, weight, sex, age, lifestyle etc... And tells you not only how many calories you should be consuming (you set targets like 'i want to lose 1lb a week') but whether you are getting your RDA of essential vitamins, minerals, protein etc...
Since Elle was born I've lost 39lb (admittedly I had a 10lb baby and a lot of fluid retention which accounts for a lot of that) but it's not bad for two weeks with no exercise due to crappy hip!
You can also make friends with people for accountability (my sister and I are doing it together) so if anyone fancies joining in, you can search me - my name is katiejo42.
P.S. No I don't work for them, I'm just very evangelical about anything that helps me lose weight!! 