As a species, humans have the unprecedented ability to manipulate and drastically alter the world in which we live. Also, with the exception of wide-spread epidemics of infectious diseases, there is no natural check on human population growth. As populations continue to expand, resources are becoming increasingly scarce. As urban and suburban populations increase, more and more people are leaving behind not only the countryside but also local sources of fresh vegetables, fruits, poultry, meat and dairy products. Commercial processing, packaging, and transportation of food over long distances has become necessary to supply food for city dwellers and suburban communities(thank God for the local farmers markets around here in north Alabama). But calories and not much else are supplied by these methods. A source of energy is provided but the quality of the food is substantially reduced.
In terms of your health and well-being it’s very important not to “overdraw your health account”. Withdrawals should never exceed deposits. The trouble is that sometimes we don’t even realize that we’re making a withdrawal, or we forget to make sure we’ve had enough deposits to cover a big withdrawal. When this happens, we tend to get sick.