Best indicator of protein quality is:
**Core Concept**
The best indicator of protein quality is a measure that reflects the efficiency of protein utilization by the body. This is crucial in clinical settings, especially in patients with malnutrition or those requiring nutritional support.
**Why the Correct Answer is Right**
The correct answer is **Net Protein Utilization (NPU)**, which is the ratio of amino acid converted to proteins to the amino acid supplied. NPU is a reliable indicator of protein quality as it takes into account the efficiency of protein digestion, absorption, and utilization by the body. It is calculated as the percentage of nitrogen in the dietary protein that is retained by the body.
**Why Each Wrong Option is Incorrect**
**Option A:** **Digestible Protein (DP)** is a measure of the proportion of protein that can be digested, but it does not account for the efficiency of protein utilization by the body. It is an incomplete measure of protein quality.
**Option B:** **Protein Efficiency Ratio (PER)** is a measure of the growth rate of experimental animals fed a protein source, but it is not applicable to humans and does not reflect the efficiency of protein utilization.
**Option C:** **Biological Value (BV)** is a measure of the proportion of dietary nitrogen that is retained by the body, but it does not account for the efficiency of protein digestion and absorption.
**Clinical Pearl / High-Yield Fact**
When assessing protein quality, it is essential to consider the NPU, which is influenced by factors such as protein digestibility, amino acid composition, and the presence of anti-nutritional factors.
**Correct Answer: C. Biological Value (BV)**