If the success of the potato feast can be attributed to two important factors: a) the satiety of the potato and b) the absence of fat (very low-fat diet), can it be concluded that any combination of very (naturally) low-fat/high-carb foods would produce similar results? Take the juice "fast" results of the documentary "Fat, Sick, and Nearly Dead" for example. If you ate nothing but potatoes and vegetable juice and rice and sweet potatoes for two weeks, would the results be similar? Keep in mind, the high satiety component of the potato seems to be crucial to compliance and overall energy levels, so it's obviously an important element. I'd wager that results would be similar, but comfort and energy might vary in either direction.