WebMD
Font Size
A
A
A

Protein

Protein is an essential nutrient made up of building-block chemicals called amino acids. Protein provides energy and is needed for the body to make new cells, to maintain and rebuild muscles, to carry other nutrients, to act as messengers in the body, and to support the immune system.

Author Caroline Rea, RN, BS, MS
Editor Susan Van Houten, RN, BSN, MBA
Associate Editor Pat Truman, MATC
Primary Medical Reviewer Ruth Schneider, MPH, RD - Diet and Nutrition
Specialist Medical Reviewer Joanne P. Ikeda, MA, RD - Nutrition Education Specialist and Lecturer
Last Updated September 13, 2007

WebMD Medical Reference from Healthwise

Last Updated: September 13, 2007
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.