Free Radicals

Free radicals are chemically hyperactive molecules, whose outer layer situates odd number of electrons. Such instability forces this molecule to “attack” the near stable molecule to get from there missing electron. This process changes this stable molecule into free radical. Although free radicals lifetime is extremely short it can cause chain reaction which is called oxidative stress.
Red Apple

This process may destroy the healthy body cell. Antioxidants neutralize free radicals by transferring one of its electrons to free radical and so stopping the chain reaction.

Healthy organism has a balance between free radicals and antioxidants. Free radicals become dangerous, if the balance is violated. The formation of free radicals promote unhealthy lifestyle such as smoking, alcohol consumption, either the food which is polluted with heavy metals and pesticides, some drugs, radioactive and ultraviolet radiation. Usually the human organism is able to independently create a balance between free radicals and antioxidants. In the situation of increasing unhealthy lifestyles and the pollution of environment the organism is not able to manage with keeping the balance. The situation changes radically in human aging when the result of human organism weakening is dislodged balance between free radicals and antioxidants.