I know that I'm FAR from being as knowledgable as Mr. X when it comes to nutrition... but I did lose a lot of weight during H.S. and I tried several methods. None of them worked, until I just started eating healthy, and lifting weights excessively. My diet wasn't any miracle diet.. I just ate sparingly, watched my calorie intake, and cut the fast food and sodas. I lost 25lbs of fat. It took me longer than the Atkins diet, but the fat has stayed off. I found some useful info about the "Atkins" diet, and about reaching "ketosis" that I found useful. Using Ketones for energy will inflict enormous amounts of metabolic stress. Even though you can loose lots of weight this way, it's obviously temporary mostly because of the dehydration effect. Your brain requires carbs for fuel, taking them away can lead to being light headed, or disoriented. It can also create dangerously low blood sugar levels. For those that incorporate insulin, you could be sending your self into a state of comatosis due the severe drop in blood sugar. Constipation is often experienced on this diet as well. Your energy levels will drop... and on top of all that.. it's extremely catabolic. I would highly suggest if you want to lose 15 pounds, just look back and see the methods men have used for decades that work over, and over again: Take in fewer calories, eat less, lift weights.. never, EVER fails. More and more people are getting fat, not because they eat more startches, or take in more carbs.. but because they're lazy, and survive off of fast food! Take time to prepare good meals, throw them in the fridge.. and microwave them when you're ready. I know that 90% of this board is body builders, and people aspiring to be bodybuilders, so the Atkins diet, or ketogenic diet may work to help you prep for a show.. but for the average person it's definately a bad idea because there's no way to keep it up long. It's like kickin the shit out of your body from the inside. So, if you're trying to squeeze into a prom dress in 3 weeks.. try the Atkins diet. If you want to get into good shape, WORK OUT!