The high potassium, low sodium diet of the Gerson therapy has been observed experimentally to cure many cases of advanced cancer in man, but the reason was not clear. Recent studies from the laboratory of Ling indicate that high potassium, low sodium environments can partially return damaged cell proteins to their normal undamaged configuration. Therefore, the damage in other tissues, induced by toxins and breakdown products from the cancer, is probably partly repaired by the Gerson therapy throught this mechanism.