Good post mouseclick,
if you notice this has been the premise of Natural Hygiene from its very inception in the mid 1800's.
Fuhrman has his roots within Natural Hygiene, and his diet is essentially one of a high water content with what he refers to as a nutrient dense diet.
Fasting is really for healing and cleansing, and where weightloss is minimized by the body to conserve food reserves and therefore not the best option for losing weight.
Anyone wishing to lose weight, and that alone, are well-advised to follow his eating plan and avoid the necessity for undertaking a fast anyway, but anyone wishing to maximize healing in the short-term, is advised to adopt the water-fast.