"The white part of the rind, including the pith, has nearly the same amount of vitamin-C as the flesh and contains sources of pectin. Pectin is a soluble dietary fiber with potential to lower serum cholesterol, relieve diarrhea, act as an immune system stimulant and as anti-ulcer agent.
The pith, part of the protection layer for the orange, contains high levels of fiber, anti-cancer agents and important bioflavonoids (an antioxidant). So next time when you have an orange, think twice about peeling off those healthy beneficial white piths." source
2 navel oranges, peel and pith removed, cut into chunks
1 cup frozen blueberries
1 cup frozen raspberries
Directions: Combine all ingredients in a blender, and blend until smooth.