I tried the RYH, originally to help with my migraines which I have lived with for many years. On completing the 4-weeks' worth of recipes, I felt better than I had in many years - I just assumed that was how you started to feel when you passed 50!
Catherine does say that it can change your taste for foods too, in my case this was true. I really wouldn't want to eat a doughnut now, however, I still miss that half a teaspoon of sugar in my tea!!