Something to watch out for - the first time I tried a ketogenic diet, I developed a terrible rash on my torso after three weeks. After a few fruitless trips to the dermatologist, I found that it was very possibly something called prurigo pigmentosa, a rash that tends to occur in people fasting or in ketosis. Someone even set up a website about it - www.theketorash.com. It's unfortunate, as I had been successfully losing weight. No one really knows how to treat it, except for, well, eating more carbs.