Dancing Walnuts (image) Penn State Share Print E-Mail Caption 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. Credit Heather Annette Miller; Penn State Usage Restrictions Non-commercial use only Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.