The average portion of walnuts added to the diet was 1.3 ounces which is 9 whole walnuts or 18 walnut halves. The average portion of walnut oil was one teaspoon. Amounts of walnut products varied by individual.
Whole and shelled walnuts
Walnut sitting on cutting board
Closeup of walnut in shell
Walnuts growing on walnut tree.
Whole walnut on a wooden spoon.
Walnut trees in a grove.