Tryptophan
Tryptophan is an amino acid needed for normal growth in infants and for the production and maintenance of the body's proteins, muscles, enzymes, and neurotransmitters. It is an essential amino acid. This means your body cannot produce it, so you must get it from your diet.
Amino acid.
Amino acids are molecules that combine to form proteins. Amino acids and proteins are the building blocks of life. When proteins are digested or bro...
Function
The body uses tryptophan to help make melatonin and serotonin. Melatonin helps regulate the sleep-wake cycle, and serotonin is thought to help regulate appetite, sleep, mood, and pain.
The liver can also use tryptophan to produce niacin (vitamin B3), which is needed for energy metabolism and DNA production. In order for tryptophan in the diet to be changed into niacin, the body needs to have enough:
- Iron
- Riboflavin
- Vitamin B6
Food Sources
Tryptophan can be found in:
- Cheese
- Chicken
- Egg whites
- Fish
- Milk
- Sunflower seeds
- Peanuts
- Pumpkin seeds
- Sesame seeds
- Soy beans
- Turkey
References
Nagai R, Taniguchi N. Amino acids and proteins. In: Baynes JW, Dominiczak MH, eds. Medical Biochemistry. 5th ed. Philadelphia, PA: Elsevier; 2019:chap 2.
United States Department of Health and Human Services; United States Department of Agriculture. 2015-2020 Dietary Guidelines for Americans. 8th ed. health.gov/our-work/food-nutrition/2015-2020-dietary-guidelines/guidelines/. Updated December 2015. Accessed May 27, 2022.
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Amino acids - illustration
Amino acids are either essential, which must be supplied by food, or nonessential, which are made in the body.
Amino acids
illustration
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myPlate - illustration
The U.S. Department of Agriculture's food guide, called MyPlate, encourages consumers to make healthier food choices. The guide encourages you to make healthy choices and avoid oversized portions. Half your plate should be filled with fruits and vegetables. At least half of your grains should be whole grains. You also should switch to fat-free or low-fat milk.
myPlate
illustration
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Amino acids - illustration
Amino acids are either essential, which must be supplied by food, or nonessential, which are made in the body.
Amino acids
illustration
-
myPlate - illustration
The U.S. Department of Agriculture's food guide, called MyPlate, encourages consumers to make healthier food choices. The guide encourages you to make healthy choices and avoid oversized portions. Half your plate should be filled with fruits and vegetables. At least half of your grains should be whole grains. You also should switch to fat-free or low-fat milk.
myPlate
illustration
Review Date: 2/4/2022
Reviewed By: Meagan Bridges, RD, University of Virginia Health System, Charlottesville, VA. Also reviewed by David Zieve, MD, MHA, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team.
All rights reserved.