It was a great plan in theory, but when we tested water-only fasting in cancer patients, the three-day trial was not exactly a roaring success. Not because the results were bad—they were in fact very promising—but because the patients, who were undergoing chemotherapy at the time, found it difficult to undergo such an extreme fast, and their doctors and nurses were also very resistant to the idea (see chapter 7 for more on cancer prevention and treatment). So we needed to find a different solution.