I read in the D'Adamo Book that Type A, B and AB are prone to Gallstones. If you have the book it is page 284. Also if you look on http://www.dadamo.com or one I found reciently was http://www.laurapower.com whom stats Lab testing, however I havn't really looked at the site yet. I have also found this site very usefull for the scientific side of it, however not everyone wants to go that in depth. http://www.owendot.com/Health_Science/ABO_Blood_Cells.html