What the ORAC score means
Tuesday, February 3rd, 2009Antioxidants help eliminate oxygen free radicals from the human body. This ability is measured through a test tube analysis called ORAC, or Oxygen Radical Absorbance Capacity. The ORAC score is used to indicate the amount of antioxidants in one food source.
What are free radicals?
Free radicals are also called oxygen radicals. These are chemicals that form inside our bodies from natural processes such as digestion or physical activity. External forces such as pollution, solar radiation and rotten food also cause free radicals.
What do free radicals do?
Imagine rust forming on metal. As rust eats away the surface, the metal erodes and eventually becomes unusable. This is how free radicals attack our body – they weaken our cells, organs, tissue and other important parts, leading to diseases such as cancer, heart ailments, osteoarthritis and dementia.
The ORAC scale
Dr. Guohua Cao, a chemist-physician, is credited with the creation of the ORAC index. The ORAC test identifies and measures important antioxidants in a food source.
Foods with a high ORAC score can raise the antioxidant levels in the blood by up to 25 percent. Doctors recommend that we consume fruits and vegetables with a total ORAC score of 1,750 per day.
Because some plants contain more antioxidants than others, it is possible to achieve 1,300 ORAC units from seven kinds of vegetables or 6,000 ORAC points from just one type of fruit. Eight to ten servings of brightly colored fruits and dark green vegetables can give you an ORAC score of 5,000.
Acai tops the ORAC list
Blueberries, raspberries, grapes, broccoli, garlic, oregano and tomatoes rate high on the ORAC scale. But no single food source comes close to the ORAC score of the acai berry from Brazil.
A study done by researchers from the US Department of Agriculture, the University of Arkansas, Brunswick Laboratories, the National University of Singapore and the University of California confirmed that freeze-dried acai fruit pulp has the highest ORAC antioxidant values of any food.
Compared to blackberries (53), pomegranates (105), and blueberries (92), acai has an amazing ORAC score of 1,027 per gram. Some samples of freeze-dried acai turned out ORAC results of up to 50,000.
While these figures are impressive, they do not apply to all acai. Frozen, spray-dried and air-dried acai have lower ORAC values because many of the polyphenolics, enzymes and nutrients of the acai fruit are lost in the process.
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