How Antioxidants Work

Antioxidants minimize damage and keep your body's cells healthy

By Jeanie Lerche Davis
WebMD Weight Loss Clinic - Feature

Reviewed By Charlotte E. Grayson, MD

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.

Here's how oxidation works. 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.