There are so many reasons for losing weight:
Clothes fit better.
Easier to shop.
Skin looks great.
Look younger.
Don't snore/knees don't ache.
Easier to look good - even if I just throw something on, and its not coordinated, hair unwashed or whatever at least I'm not overweight as well!
People treat me much, much better. It is ridiculous actually, the way people are so much nicer to you. They give you more respect. But it's true that women are jealous.
It's assumed that I am more competent/capable/ intelligent. I'm not, ha!
At my biggest I was an 18. I'm now a 10. I'm 5'5 and have realised that I do not need that many calories in a day. 1400 is enough for me.
Lower carb worked for me - cutting out pasta and bread. I still eat potatoes, sweet potatoes, squash etc and lots of pulses. Pump your portions up with loads of veg. Cut out sugar and alcohol, it does you no favors at all.
This may sound silly but when I see someone I can tell what they eat judging by their skin. Fruit and veg = a glow, it really does. Sugar and simple carbs = grey.
MFP was an eye-opener too, its amazing how many calories are in stuff! Breakfast cereal was the worst.