Hello, I am a successful "dieter" who has kept the weight off for many years! I have written a few hubs(you can go to my "profile" http://hubpages.com/profile/LowCarb+Lowdown to check them out) on dieting and have a website all about Low Carb Diets - http://lowcarblowdown.com. (which is just one approach to dieting!)
There are only two things that you need to know to lose, gain or maintain weight.
1. Calories IN versus calories OUT. It's that simple! If you eat more calories than you burn - you gain weight. Eat less than you burn - you lose weight!
2. You must find the RIGHT "eating lifestyle" that works for you. Whether you go Low Carb, a "Weight Watchers" type plan or some other method - you will be successful if you do what fits YOU! If you have a passion for playing the piano and you take guitar lessons then you probably will not be happy or very successful with the guitar. The same is true with "dieting".
Find an eating lifestyle (not diet) that fits you and take in less calories than you burn - the result will be the body weight that you desire!
Of course you should get proper rest, drink plenty of water, exercise. etc. and life a healthy overall lifestyle. These 2 things are just the pure basics to weight control.