Yes alot of information has been discovered since Atkins origionaly proposed his diet in 70'something. That is why there is at least 10 different revisions of his book, and his latest book Atkins for life. After writing his diet plan, Atkins didn't sit back and just let royalties come back. They have wonderful weight loss clinics and research facilities that are constantly updating ideas and advice based on latest studies and observation from the millions of clients who use the clinics.

If you are using a version of New Diet Revolution for the 70's, then I would say it is deffinetly time to udate. You can also get many of the most up to date studies performed by people outside of Atkins on the Atkins web site under the section "The Science Behind Atkins".