|Hunger Report, The: 1988
||The 1985 food supply could provide an adequate basic diet, primarily vegetarian, to about 6 billion people. The same food supply could provide a modestly improved diet, with about 15 percent of its calories from animal products (about what people in South America have available today), to 4 billion people. Some 1.3 billion people in the present population would get nothing at all to eat if that level of nutrition were given to the rest. A "full-but-healthy" diet, with approximately 35 percent of its calories from animal sources, could be fed to roughly 2.5 billion people, less than half the 1990 population.