I'm doing it for both. After about two months I feel fabulous, have tons of energy, and have lost about 20 pounds so far. I'm also gaining muscle though, since I work out about 45 minutes 4-5 days a week. I also only eat about two meals a day, and not what people would consider full meals. It was the change I needed. After getting off pasta and bread and stuff I do not foresee going back to it in the future. I don't really miss it at all (except potato chips, but even that craving is lessening). Once you realize what you're putting in your body, and in what quantities, they don't taste as good. I love vegetables too, that helps tremendously. A friend and I were discussing getting into actual ketosis and I am considering doing like a two week round.