Refining Ounce-Equivalents Using the EAA-9 Approach for Protein Scoring and Dietary Guidance.

Area of Science:

• Nutritional Science
• Food Science

Background:

• The US Department of Agriculture (USDA) Protein Food ounce-equivalents aim to standardize protein food identification and serving sizes.
• However, this system does not ensure equivalent exchanges for protein or essential amino acids (EAAs).

Purpose of the Study:

• To accurately determine the EAA content within USDA Protein Food ounce-equivalents.
• To develop a more precise food exchange list based on EAA profiles.
• To evaluate the EAA-9 protein quality framework for accurate EAA-equivalent substitutions.

Main Methods:

• Utilized the USDA National Nutrient Database (Standard Reference Legacy) and the EAA-9 protein quality model.
• Calculated EAA composition for USDA Protein Food ounce-equivalents.
• Established EAA-9 Equivalence serving sizes using an egg as a protein standard.

Main Results:

• Significant disparities exist in EAA content among USDA Protein Food ounce-equivalents (e.g., chicken vs. almonds).
• <15% of bean, pea, lentil, nut, and seed ounce-equivalents meet the EAA profile of a standard egg serving.
• EAA-9 Equivalence servings provide reliable and interchangeable protein sources, meeting EAA requirements.

Conclusions:

• USDA Protein Food ounce-equivalents offer insufficient guidance for balancing EAA requirements.
• Accurate food exchanges must be developed to ensure EAA requirements are met through protein food substitutions.