Yeah, you won't find much on MDA, because the level on Mark's Carbohydrate Curve that would correspond to ketosis is understtod to be only for an occasional excursion. Not a focus of interest here.
The most readable account seems to be Volek & Phinney's book The Art and Science of Low Carbohydrate Living. It's interesting and worth getting and reading. I'd say that outside specific applications -- epilepsy, Alzheimers, endurance sports, etc. -- it's not clear that ketogenic diets are a must. However, to state that they're known to be harmful seems like going out on a limb to me. I don't know of any evidence that that's so. Steve Phinney himself has been on a ketogenic diet for 7 years. Since he's a well qualified medical doctor and researcher with a range of equipment and tests available to him I guess he'd have noticed by now if it was affecting his health negatively.