[comicjk]

I agree that, for a given caloric deficit, a ketogenic diet produces less perceived hunger, so you "lose weight while not even trying". However, keto also keeps your glycogen stores low, which reduces cardiovascular performance while the diet persists. This makes keeping muscle harder, especially if you have a lifestyle with requisite cardio (e.g. bicycle commuting). I don't think high-intensity cardio + keto is a good idea because, in the absence of glycogen, the body can tap muscle protein as a peak-power energy source.