Sunday, 18 May 2014

WHAT ARE FREE RADICALS? 什么是自由基?

Free radicals are organic atoms or molecules that have an unpaired electron in their outer cellular ring. Since electrons have a tendency to exist in pairs, free radicals become unstable and latch on to electrons from other atoms and molecules in your body. This cycle creates a biological chain reaction that can damage cell membranes, accelerate the aging process, and contribute to certain ailments. Stress, lack of sleep, a poor diet, UV radiation, exercise, and pollution can all contribute to the formation of free radicals.
These unstable atoms can lead to a physiological imbalance in your body called oxidative stress. When this occurs, your body is unable to counter the damaging effects caused by these rogue molecules. This can be demonstrated by cutting an apple in half. As the fruit is exposed to air, it starts to turn brown. On a cellular level, the oxygen in the air is interacting with the cell wall of the apple’s tissues, creating free radicals.