I've done it to get that motivational kick sometimes required to get your bum in gear. My jeans did fit better after two weeks but you need to see it as just that - a kickstart, you have to maintain a norml healthy diet wincluding exercise to keep in shape. I didn't eat Special K either, I had bran flakes or something. Eating the same cereal can get boring and hard to stick to so as long as the cereal is low in sugar and high in fibre you should be. Also, the "Special K" diet specifices you shouldn't eat between "meals", but I ignored this and snacked on fruit and veg sticks and still lost the weight. It's not a diet really, just a kick up the bum and something easy to stick to. Good luck and well done for wanting to do something :-)