The majority of people in America actually do, but their numbers are shrinking steadily. People are now becoming aware that lifestyle has everything to do with susceptibility to disease.
Toxicity means poison.
You may think of poisons as things like arsenic, or cyanide, or rat poison, or things that secret agents in James Bond movies bite in capsules just before they're captured. As every good ninja knows, there are many levels and types of poisons. The best ones kill you the slowest and are undetectable. Most modern food which the American diet comprises, is poison. A good poison will block the flow of blood, decrease the amount of oxygen to the tissues, interfere with one or more major systems of the body, actually cause addiction to the poison itself, and eventually kill the subject.