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Amino acids

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Amino acids are organic compounds that combine to form proteins. Amino acids and proteins are the building blocks of life.

When proteins are digested or broken down, amino acids are left. The human body needs a number of amino acids to:

  • Break down food
  • Grow
  • Repair body tissue
  • Perform many other body functions

Amino acids are classified into three groups:

  • Essential amino acids
  • Nonessential amino acids
  • Conditional amino acids

Essential amino acids

  • Essential amino acids cannot be made by the body. As a result, they must come from food.
  • The nine essential amino acids are: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.

Nonessential amino acids

  • "Nonessential" means that our bodies produce an amino acid, even if we don't get it from the food we eat.
  • They include: alanine, asparagine, aspartic acid, and glutamic acid.

Conditional amino acids

  • Conditional amino acids are usually not essential, except in times of illness and stress.
  • They include: arginine, cysteine, glutamine, tyrosine, glycine, ornithine, proline, and serine.

You do not need to eat essential and nonessential amino acids at every meal, but getting a balance of them over the whole day is important.

References

Trumbo P, Schlicker S, Yates AA, Poos M; Food and Nutrition Board of the Institute of Medicine, The National Academies. Dietary reference intakes for energy, carbohydrate, fiber, fat, fatty acids, cholesterol, protein and amino acids. J Am Diet Assoc. 2002;102(11):1621-1630.

Escott-Stump S, eds. Nutrition and Diagnosis-Related Care. 6th ed. Philadelphia Pa: Lippincott Williams & Wilkins; 2008.


Review Date: 2/8/2011
Reviewed By: A.D.A.M. Editorial Team: David Zieve, MD, MHA, and David R. Eltz. Previously reviewed by Alison Evert, MS, RD, CDE, Nutritionist, University of Washington Medical Center, Diabetes Care Center, Seattle, Washington (2/8/2011).
The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed medical professional should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. © 1997- A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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