Although it is widely held that infections and eating difficulties are hallmarks of advanced dementia,25 there are few prospective data on the incidence of these complications. Over the course of 18 months, more than half of the residents in our study had infectious episodes, and 86% had eating problems.
So 10 billion people is the uppermost population limit where food is concerned. Because it's extremely unlikely that everyone will agree to stop eating meat, Wilson thinks the maximum carrying capacity of the Earth based on food resources will most likely fall short of 10 billion.
Carrying capacity describes the maximum number of individuals or species an specific environment's resources can sustain for an indefinite period of time without degrading it. While there are small factors that may influence a particular environment -- or habitat -- from time to time, four major factors affect the carrying capacity of the environment. Food Availability Food availability in any habitat is paramount to survival of a species.