I think I might just buy Good Calories, Bad Calories after reading this. It might not tell me anything I haven't learned indirectly through other writers but if it's written as well as this blog post that will justify its value alone.
Looking forward to the new book incidentally, and hoping it isn't a content-less and repetitive discussion of magazine clippings as this kind of book can often be (I have no reason to suspect it will be, beyond bad experiences with other books).