Welcome to the forum!
In my opinion, the answer lies in actually changing the way you live, not in fad diets or miracle plans that last for a few months then you go back to your same old lifestyle which is where the weight came from in the first place. It's about learning how to live a healthy life which means regular exercise and eating sensibly. The formula really really is as simple as making what goes in be less than what goes out, the execution on the other hand is more difficult.
Maybe while you're in the zone, you should start with a god hard look at why you have struggled with your weight over the years. Is it your diet? What are you eating? How much are you eating? When are you eating? Then what bout exercise? Are you active or do you sit around all day every day? Are there any medical reasons you're carrying extra weight that a GP could help with?
Knowledge is power and once you know about what it is that is contributing to the extra weight you are in a position to make plans to change it.
Al the best
35kg lost. (November 2005 - October 2006)
15kg gained again (as at October 2010).
Back to the drawing board - Let's do this thing!
"You can't change the winds, but you can change the sails"
"Reach out and take control of what lands in your lap"