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.
Conditions within or adjacent to an environment also affect its carrying capacity. For example, if the environment is located close to a human population, this may affect its carrying capacity. Pollution may also affect an environment's carrying capacity. A natural disaster, such as a hurricane or a flood, also affects the ability of an environment to sustain animal or plant populations.