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Amino Acid Profile – Definition, Function and Analysis

An amino acid profile describes the composition and quantity of all amino acids found in a food or in the blood. It indicates how well a protein meets the nutritional needs of the human body.

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Things worth knowing about "Amino Acid Profile"

An amino acid profile describes the composition and quantity of all amino acids found in a food or in the blood. It indicates how well a protein meets the nutritional needs of the human body.

What Is an Amino Acid Profile?

An amino acid profile describes which amino acids are present in a food, supplement, or in human blood, and in what quantities. Amino acids are the building blocks of proteins and perform numerous vital functions in the body – from muscle development and hormone production to immune defense.

There are 20 proteinogenic amino acids that the body uses to build proteins. Of these, 9 are classified as essential, meaning the human body cannot synthesize them and must obtain them through the diet. Others are classified as semi-essential or non-essential.

Essential, Semi-Essential, and Non-Essential Amino Acids

Essential Amino Acids

The following 9 amino acids must be obtained through food:

Histidine
Isoleucine
Leucine
Lysine
Methionine
Phenylalanine
Threonine
Tryptophan
Valine

Semi-Essential Amino Acids

Amino acids such as arginine and glutamine can be produced by the body under normal circumstances. However, during illness, stress, or intense physical training, the body´s demand may exceed its own production capacity, making dietary intake important.

Non-Essential Amino Acids

Amino acids such as alanine, glycine, and serine are synthesized by the body in sufficient amounts under normal conditions and do not generally need to be obtained through diet.

Biological Value and Completeness of the Amino Acid Profile

The biological value of a protein describes how closely its amino acid profile matches the nutritional needs of the human body. The more similar the profile is to the body´s own requirements, the higher the biological value and the more efficiently the protein can be utilized.

Animal protein sources such as eggs, meat, fish, and dairy products typically provide a complete amino acid profile, containing all essential amino acids in adequate amounts. Many plant-based sources, however, have an incomplete amino acid profile, lacking sufficient quantities of one or more essential amino acids – known as limiting amino acids.

By combining complementary plant-based foods – for example legumes with grains – a complete amino acid profile can be achieved, which is particularly relevant for well-balanced vegan or vegetarian diets.

Amino Acid Profile in Medical Diagnostics

In clinical medicine, the amino acid profile in blood or urine can be measured to:

Diagnose metabolic disorders such as phenylketonuria (PKU) or other inherited amino acid metabolism disorders
Identify malnutrition or protein deficiency
Monitor nutritional status in patients with chronic disease, post-surgery, or in intensive care settings
Evaluate the effectiveness of dietary therapies or athletic training programs

Amino Acid Profile in Sports Nutrition

In sports nutrition, the amino acid profile plays a central role, as amino acids – especially the branched-chain amino acids (BCAAs) leucine, isoleucine, and valine – are directly involved in muscle protein synthesis. Protein supplements such as whey protein, soy protein, and pea protein are frequently compared and evaluated based on their amino acid profiles.

An optimal amino acid profile for sports nutrition should contain a particularly high proportion of leucine, which is considered the most important trigger of muscle protein synthesis.

Amino Acid Profile in Foods

Different foods provide different amino acid profiles. Here is an overview of typical sources:

Animal sources: Eggs, chicken, beef, fish (e.g., salmon, tuna), milk, cottage cheese, hard cheeses
Plant-based sources with a relatively complete profile: Soy, quinoa, amaranth, hemp seeds, spirulina
Plant-based sources with an incomplete profile (require complementing): Wheat, corn, rice, lentils, chickpeas

References

World Health Organization (WHO) / Food and Agriculture Organization (FAO): Protein and Amino Acid Requirements in Human Nutrition. WHO Technical Report Series 935, Geneva, 2007.
Elmadfa I., Leitzmann C.: Nutrition of Humans. 5th Edition, Verlag Eugen Ulmer, Stuttgart, 2015.
Stoll B. et al.: Amino acid nutrition and metabolism – PubMed, National Library of Medicine. Available at: https://pubmed.ncbi.nlm.nih.gov

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