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