I honestly have never dieted. Diets are meant to be temporary, due to changing the way you eat very drastically, and therefore, any results you see are usually lost when you go off them (and make no mistake, most people do).
Now, this isn't to say I don't eat healthy, because I do. I did a complete overhaul of the way I eat, but I did so in a way that I like what I'm eating now, and my body learned to crave the healthy stuff rather than sweets. Small, sustainable lifestyle changes are the way to go.