And when did you stop?
I've been yoyo dieting literally almost my entire life.
The earliest I can remember, is when I was about 7 or 8. I'm serious. I remember for a while purposely cutting everything on my plate in half, and only eating one half of it. The rest I wouldn't allow myself to eat. I wasn't overweight at all...I was actually a very skinny child due to very enlarged tonsils and being very active.
Anyway, I've done a lot of crazy diets in my life. I starved myself for a while, I chewed and spit for a short period of time (ew.). I've done low carb, eaten only fruits and veggies, eaten only salads 7 days a week, drank apple cider vinegar with every meal, juice fast, one big meal a day only, special K, slimfast, diet pills, calorie counting, coffee and cigarette diet....
So this is the first time in my life that I've actually counted calories consistently. And this is the first time in my life I've realized that I'm going to have to do it for the rest of my life. I can't diet my way out of obesity, and then go back to "normal" once I've lost the weight.
It took me almost a decade or two to get it, but at 23 I've finally got it through my thick skull. I'm never going to diet again.