all over the world, and land now used for the production of grains, rice, corn, and starches were switched to the production of vegetables and meat, would there be enough vegetables and arable land to feed the world? Or will grains, rice, corn, and starches always be needed, because of the amount of energy they contain relative to the amount of land required to grow them?
Can we say that man's choice of grains et al. when he became a farmer was not due to intelligence but more to an uncontrolled appetite for sugars (and fallen man's weakness)? The first farmers may have been ignorant of the negative consequences of a carb-heavy diet, but can we have the same excuse?