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Free radicals are everywhere, in the air, our bodies, and the materials around us. They cause the deterioration of plastics, the fading of paint, the degradation of works of art, aging related illnesses, and can contribute to heart attacks, stroke and cancers. Free radicals are molecules with unpaired electrons. In their quest to find another electron, they are very reactive and cause damage to surrounding molecules.
An apple slice turns brown. Fish becomes rancid. A cut on your skin is raw and inflamed. All of these result from a natural process called oxidation. It happens to all cells in nature, including the ones in your body. To help your body protect itself from the rigors of oxidation, Mother Nature provides thousands of different antioxidants in various amounts in fruits, vegetables, whole grains, nuts, and legumes. When your body needs to put up its best defense, especially true in today's environment, antioxidants are crucial to your health.
As oxygen interacts with cells of any type - an apple slice or, in your body, the cells lining your lungs or in a cut on your skin -- oxidation occurs. This produces some type of change in those cells. They may die, such as with rotting fruit. In the case of cut skin, dead cells are replaced in time by fresh, new cells, resulting in a healed cut.
This birth and death of cells in the body goes on continuously, 24 hours a day. It is a process that is necessary to keep the body healthy. "Oxidation is a very natural process that happens during normal cellular functions," researcher Jeffrey Blumberg, PhD, professor of nutrition at Tufts University in Boston, tells WebMD.
Yet there is a downside. "While the body metabolizes oxygen very efficiently, 1% or 2% of cells will get damaged in the process and turn into free radicals," he says.
"Free radicals" is a term often used to describe damaged cells that can be problematic. They are "free" because they are missing a critical molecule, which sends them on a rampage to pair with another molecule. "These molecules will rob any molecule to quench that need," Blumberg says.
When free radicals are on the attack, they don't just kill cells to acquire their missing molecule. "If free radicals simply killed a cell, it wouldn't be so bad… the body could just regenerate another one," he says. "The problem is, free radicals often injure the cell, damaging the DNA, which creates the seed for disease."
When a cell's DNA changes, the cell becomes mutated. It grows abnormally and reproduces abnormally -- and quickly.
Normal cell functions produce a small percentage of free radicals, much like a car engine that emits fumes. But those free radicals are generally not a big problem. They are kept under control by antioxidants that the body produces naturally, Blumberg explains.
External toxins, especially cigarette smoke and air pollution, are "free radical generators," he says. "Cigarette smoke is a huge source of free radicals." In fact, our food and water also harbor free radicals in the form of pesticides and other toxins. Drinking excessive amounts of alcohol also triggers substantial free radical production.
* Page source: http://www.webmd.com/food-recipes/features/how-antioxidants-work1, http://www.freeradical.org.au/education.php?page=6