Val (Valine) – Essential Amino Acid
Val is the abbreviation for valine, an essential amino acid that the human body cannot produce on its own and must be obtained through the diet.
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Val is the abbreviation for valine, an essential amino acid that the human body cannot produce on its own and must be obtained through the diet.
What is Val (Valine)?
Val is the one-letter symbol and three-letter abbreviation for valine, an essential branched-chain amino acid (BCAA). Since the human body cannot synthesize valine on its own, it must be obtained daily through food. Together with leucine and isoleucine, valine is one of the three branched-chain amino acids that play a central role in muscle energy metabolism.
Biological Functions
Valine performs several important functions in the body:
- Muscle growth and maintenance: Together with leucine and isoleucine, valine stimulates protein synthesis in muscle tissue and helps preserve muscle mass.
- Energy supply: During intense physical activity, valine can be used directly within muscle cells as an energy source.
- Nitrogen balance: Valine is involved in regulating the nitrogen balance in the body and supports the transport of nitrogen between tissues.
- Nervous system support: Valine contributes to normal brain function by competing with other amino acids for transport across the blood-brain barrier.
- Wound healing and tissue repair: As a building block of proteins, valine is involved in tissue repair processes.
Dietary Sources
Valine is found in many protein-rich foods. Particularly good sources include:
- Meat (beef, poultry, pork)
- Fish and seafood
- Milk, cheese, and other dairy products
- Eggs
- Legumes (lentils, beans, peas)
- Nuts and seeds
- Whole grains (e.g., quinoa)
Recommended Intake
The World Health Organization (WHO) recommends a minimum daily intake of 26 mg of valine per kilogram of body weight for adults. For a person weighing 70 kg, this corresponds to approximately 1,820 mg per day. Athletes and individuals with higher protein needs may require more.
Deficiency Symptoms
Valine deficiency is rare in individuals following a balanced diet, but may occur in the following at-risk groups:
- People following a very one-sided or severely calorie-restricted diet
- Individuals with malabsorption syndromes (e.g., celiac disease, Crohn's disease)
- People with alcohol dependence
- Older adults with reduced protein intake
Symptoms of valine deficiency may include: muscle weakness, coordination disorders, difficulty concentrating, slowed wound healing, and general fatigue.
Overdose and Safety
Excessive valine intake, for example through high-dose BCAA supplements, can lead to side effects such as nausea, gastrointestinal discomfort, and in rare cases neurological symptoms. In individuals with kidney disease or metabolic disorders (e.g., maple syrup urine disease), valine intake should be medically supervised.
Interactions
Valine competes with other large neutral amino acids (e.g., tryptophan, phenylalanine) for transport across the blood-brain barrier. Very high intake of BCAA supplements may therefore theoretically reduce the uptake of tryptophan into the brain, potentially affecting serotonin production. Individuals taking blood sugar-lowering medications should consult a physician, as BCAAs can influence glucose metabolism.
References
- World Health Organization (WHO): Protein and Amino Acid Requirements in Human Nutrition. WHO Technical Report Series 935, Geneva, 2007.
- Blomstrand E. et al. – Branched-chain amino acids activate key enzymes in protein synthesis after physical exercise. Journal of Nutrition, 2006.
- Stipanuk M. H., Caudill M. A. – Biochemical, Physiological, and Molecular Aspects of Human Nutrition. 3rd Edition, Elsevier Saunders, 2013.
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