Oh it's possible to survive for a short while off rice. You won't live well, and it will probably significantly shorten your life and you'll have to kill wild animals for their meat because you can survive off rice it isn't enough to do menial labor for long periods of time. But my parents did it! Before they decided to say fuck you to the Khmer Rouge, and run away, anyways.
I think it says something even more disturbing than the prima facie fact that one can't live off rice and beans, and that is that Hannity sees such a basic (undernourishing) diet as perfectly acceptable for poor families and children. All the while, Hannity himself enjoys, on a regular basis, meals many of us can't imagine. At least Maria Antoinette was nice enough to
offer the peasants cake*
*I've heard she never said this, but the popular myth that the French Revolutions began over the upper class' ignorance to the plight of the poor serves the purpose that reality is worse than fiction.