He has another book out 'Genome type diet'. It goes into further genetic indicators for what to eat and not to eat. In this diet some types are able to eat pork products. I have read about half the book, but haven't done the measurements. I have seen some people lose a lot of weight on the Adkins diet. I did read the his book. I think there is something to it, but I prefer D'Adamo. D'Adamo directly anwers what type of grains you should eat. It varies as to blood type. A few other books I think are valuable are Dr. Mark Hymen's "Ultrametabolism" and Brenda Watson's "Detox" (not the full title).
I think there are a few other factors that kids today face that we didn't. Try picking up some off the self drink that doesn't have high frutose corn syrup in it. Also, look at packages for trans fats. These were being added in the mid '70s. I think that is when the obsesity problem started to emerge. Also, they slow you down so you get fatter, wich slows you down more. Some of this info is just making to main stream medical practice. Its been around the natural/homepathic realm for a while.
Tom