I lost my 80 pounds on Protein Power
I did buy and read Protein Power Life Plan
I recommend both
The one thing that needed changing in Protein Power was the recommendation to keep fats down - so don't eat too many eggs because of the fat content, etc. I am sure this was to please the publishers who were afraid to go against the Dietary Recommendations for Americans.
I recommend it as a reference. The Eades always give the chemistry and physiology to make their recommendations acceptable.