Very interesting that you mention a skin disease doctor who treats his patients with sashami. I've been raw only since winter solstice 2009, and by far the biggest change has been in my skin. I used to suffer very dry skin all winter long, and winter is loooong here in Vermont. Now it is bitterly cold and the dead of winter, but after just a few weeks of eating raw deer and chicken my skin is as soft and moist as it usually gets in summer, if not even softer and moister. I was thinking about this last night as I laid down to bed, that I could rub my fingers together and it felt as if there was a slight lubricant there, although my skin didn't feel greasy.
But regarding Takamatsu, being loosely affiliated with the Bujinkan (I am no longer a card-carrying member and have burned all of my rank, but still look to a a few members for inspiration) I have read at least one version of the story about how Takamatsu fled into the forest and healed himself. The version I read was in the book Essence of Ninjutsu, I believe. Since reading the book about ten years ago I have been told that Hatsumi fabricated most of the stories in it, or at the very least they are so embellished that they should be treated as fabrications. I am also told, though, and from a source that I trust, that Takamatsu did indeed eat all of his meat and most of his vegetables raw. What percentage raw foods made up of his diet and what types of meat he regularly ate I do not know.