The waste products of digestion, of indigestion, of cellular breakdown and the general metabolism are all poisonous to one degree or another. Another word for this is toxic. If these toxins were allowed to remain and accumulate in the body, it would poison itself and die in agony. So the body has a processing system to eliminate toxins. And when that system does break down the body does die in agony, as from liver or kidney failure. The organs of detoxification remove things from the body's system, but these two vital organs should not be confused with what hygienists call the secondary organs of elimination, such as the large intestine, lungs, bladder and the skin, because none of these other eliminatory organs are supposed to purify the body of toxins. But when the body is faced with toxemia, the secondary organs of elimination are frequently pressed into this duty and the consequences are the symptoms we call illness. The lungs are supposed to eliminate only carbon dioxide gas; not self-generated toxic substances. The large intestine is supposed to pass only insoluble food solids (and some nasty stuff dumped into the small intestine by the liver). Skin eliminates in the form of sweat (which contains mineral salts) to cool the body, but the skin is not supposed to move toxins outside the system. But when toxins are flowed out through secondary organs of elimination these areas become inflamed, irritated, weakened. The results can be skin irritations, sinusitis or a whole host of other "itises" depending on the area involved, bacterial or viral infections, asthma. When excess toxemia is deposited instead of eliminated, the results can be arthritis if toxins are stored in joints, rheumatism if in muscle tissues, cysts and benign tumors. And if toxins weaken the body's immune response, cancer. The liver and the kidneys, the two heroic organs of detoxification, are the most important ones; these jointly act as filters to purify the blood. Hygienists pay a lot of attention to these organs, the liver especially. In an ideal world, the liver and kidneys would keep up with their job for 80 years or more before even beginning to tire. In this ideal world, the food would of course, be very nutritious and free of pesticide residues, the air and water would be pure, people would not denature their food and turn it into junk. In this perfect world everyone would get moderate exercise into old age, and live virtually without stress. In this utopian vision, the average healthy productive life span would approach a century, entirely without using food supplements or vitamins. In this world doctors would have next to no work other than repairing traumatic injuries, because everyone would be healthy. But this is not the way it is.