While I think the diet is unsustainable, I do think you can learn some important things about diet and nutrition from it. I've watched someone try it twice now. It's not a longterm solution to anything for 99.99% of the people who try it. I never investigated further, but I once heard Dr.Oz in an interview say that, "One potato chip, and you're out of ketosis." The context was that he was basically saying it takes an incredibly high level of dedication, and it is also incredibly sensitive to keep your body in that state. If you're going to half-ass it, you aren't actually on the keto diet.
And we'll see how healthy it is as time moves forward. I don't say that with any subtext. It's a new way of playing with the body and gut, so we'll see how the evidence collects. One thing that gets in the way of that, obviously, is if people do it for long periods of time. If most cannot, then the evidence is going to be very spotty.
Getting away from carbs and sugar is likely a good thing. I think you can navigate that just fine without this diet. It's all in the Glycemic Index. You know...the ol' diet of "eat less" and pinpoint it towards carbs and sugars. Diets are fine and all, but if they don't include exercise, then you're really just farting around with health. It's not a serious endeavor that approaches lifestyle change.
