The tongue does not always go pink, sometimes the reserves are not enough to carry on so the body will initiate hunger.
I for one, would rather believe Shelton with regards to enemas. Bragg only recommends 10 days several times a year. It all depends on why you are fasting. If for general health and well being, i think several shorter fasts are better, alot safer if doing without supervision. If you have a serious health complaint and want to go that long, or very overweight, i personally would try to find someone to supervise.
Just imho