The book I have gives only a summary; best to get a copy of "Options: The Alternative Cancer Therapy Book" by Richard Walters, and check the source directly, for details. I suspect it was the old therapy, but am not 100% sure. By the way, Jack Raso, in "Mystical Diets", p.141, claims: "More than a dozen Gerson patients have arrived comatose at San Diego hospitals as a result of electrolyte imbalances." He also discusses the bacterial infections associated with the use of calf liver. Hope the above is helpful. Tom Billings