The current world food production is enough to feed 10 billion people (50% more than the current world population) a diet of 4000 calories/day (double the recommended amount for a woman, >50% more than for a man) [1]. And that's not including fruits & vegetables, only staple grains.

People go hungry because of distribution problems, not because we don't produce enough food. Southern Nigeria exports food to the rest of Africa while people starve in Northern Nigeria because the roads are not good enough to transport food. The Red Cross sends enough food into Somalia to feed the whole country, but it is all appropriate by warlords at gunpoint. Americans grow fat on fast food while peasants elsewhere starve because many of the calories we produce are used to feed animals. That's not even talking about the millions of tons of corn that are poured into our gas tanks through ethanol subsidies.

[1] http://www.gardeningplaces.com/articles/global-food-crisis.h...