Difference between antioxidant capacity (ORAC) and antioxidant bioavailability?

Antioxidant capacity (ORAC ranking) and antioxidant bioavailability sound similar but they are two very different things!

In simple terms, one is measured outside the human body, and the second one is measured inside the human body.

ORAC can tell you which plant foods are high in antioxidants. But it cannot tell you how much of those antioxidants your body will effectively absorb!

Antioxidant bioavailability is your body’s capacity to assimilate and absorb the antioxidant compounds of a plant food into your system.

Resources

General guidance and further reading. These links have not been checked against the individual claims on this page.

  1. NHS: The vegan diet

    Public health guidance on planning a vegan diet and getting essential nutrients.

  2. British Dietetic Association: Vegetarian, vegan and plant-based diet

    Dietitian guidance on plant-based eating. The fact sheet is currently under review by the BDA.

  3. NHS: The Eatwell Guide

    Guidance on food groups and the balance of foods across a day or week.

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