It works - very well for us
My wife is an O. I am A.
Weve mostly followed the diet guidelines for 3 years. It works. When we break with the guidelines we really do notice negative responses.
So this very handy app has become really useful. As there are inconsistencies within the books, the app may conflict with some of the early ones but less with the newer ones.
We use it everyday. It is quick and handy. As for $4 being too expensive - that is just silly. Its good value and a big daily help.
Doug Robinson about
Blood Type Diet®, v1.3.1