Like Jokan said, you have to try and see what works best for you, your lifestyle, your eating habits. Don't try something too extreme or you'll end up binging. There are many different diets ladies on the board are following, some are low fat, low carb, calorie counting, weight watchers, south beach, atkins, vegan etc.
I have PCOS which means I have to keep my blood sugars under control or they will automatically be stored as fat, this is why I follow a semi-low carb diet that I worked out myself by experimenting with different levels of carbs. I cutout bread, sugar, rice, starchy and too sweet fruits and veggies as well as anything too high in fat and so far it seems to be working.
Also, remember to increase your daily activity level, you can start with something as easy as a 30 minute walk 5 days a week and work it up from there.
Good luck!