Sunday, June 6, 2010

Free radicals

   Free radicals can cause damage within the human body by attacking
extremely important molecules such as DNA, proteins, and special fatty
acids. If these or other molecules are attacked by free radicals and have an
electron removed from their structure (oxidation) it is like pulling a bot-
tom card from a house of cards. The victimized molecule is rendered
weak and unstable and subject to breakdown. An example of this oxida-
tive damage can be demonstrated by leaving vegetable oil out in an open
container exposed to sunlight. The presence of oxygen and energy from
sunlight leads to the formation of oxygen-based free radicals, which
attack the fat causing them to break down in smaller molecules. Some of
these molecules can produce an offensive odor and taste.
   Throughout time we have accepted the presence of free radicals, and
our body has evolved to meet the challenge. We are armed with a battery
of antioxidants to keep the free radicals in check. The term antioxidant
implies that these molecules will prevent free radicals from pulling elec-
trons (oxidation) from other molecules. They may do so by donating their
own electrons to a free radical. This pacifies a free radical and spares
other molecules. Antioxidants are unique because they remain relatively
stable after giving up an electron. They are designed to handle this
process.
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