Thiamine (Vitamin B1): Functions, Deficiency & Intake
Thiamine (Vitamin B1) is a water-soluble vitamin essential for energy metabolism and nerve function. A deficiency can lead to serious neurological disorders.
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Thiamine (Vitamin B1) is a water-soluble vitamin essential for energy metabolism and nerve function. A deficiency can lead to serious neurological disorders.
What is Thiamine?
Thiamine, also known as Vitamin B1 or aneurine, is a water-soluble vitamin belonging to the B-vitamin family. It is an essential micronutrient that the human body cannot produce on its own and must therefore be obtained regularly through diet. Thiamine plays a central role in energy metabolism and is indispensable for the normal functioning of the nervous system.
Biological Functions
Thiamine serves several important functions in the body:
- Energy metabolism: As the coenzyme thiamine pyrophosphate (TPP), thiamine is involved in converting carbohydrates into usable energy (ATP). It is an essential component of the citric acid cycle and oxidative decarboxylation.
- Nerve function: Thiamine supports signal transmission between nerve cells and is necessary for the synthesis of neurotransmitters.
- Heart function: The vitamin is involved in the metabolism of the heart muscle and contributes to normal cardiac function.
- Pentose phosphate pathway: As the coenzyme transketolase, thiamine participates in the pentose phosphate pathway, which is important for the biosynthesis of nucleic acids and fatty acids.
Dietary Sources
Thiamine is found in a wide variety of foods. Particularly good sources include:
- Whole grains and legumes (e.g., lentils, peas)
- Pork and other meats
- Nuts and seeds (e.g., sunflower seeds)
- Wheat germ and bran
- Yeast (brewer's yeast)
- Potatoes and vegetables
It is important to note that thiamine is heat-sensitive and can be partially destroyed during cooking. Alcohol and certain food processing methods also reduce thiamine content.
Recommended Daily Intake
The recommended daily intake of thiamine varies by age, sex, and life stage. According to the World Health Organization (WHO) and national health authorities, the following reference values apply:
- Adult men: approximately 1.2–1.3 mg per day
- Adult women: approximately 1.0–1.1 mg per day
- Pregnant women: approximately 1.2–1.4 mg per day
- Breastfeeding women: approximately 1.4 mg per day
- Children: 0.2–1.1 mg per day, depending on age
Deficiency Symptoms
Thiamine deficiency can cause several serious conditions:
Beriberi
Beriberi is the classic deficiency disease caused by thiamine deficiency and occurs in two main forms:
- Dry beriberi: Affects the nervous system, manifesting as peripheral neuropathy, muscle weakness, and paralysis.
- Wet beriberi: Affects the cardiovascular system, leading to heart failure, edema, and an enlarged heart.
Wernicke Encephalopathy and Korsakoff Syndrome
In cases of severe thiamine deficiency, often caused by chronic alcohol misuse, Wernicke encephalopathy can develop. This neurological emergency presents with confusion, eye movement disorders (ophthalmoplegia), and gait disturbances. If left untreated, it can progress to Korsakoff syndrome, characterized by severe memory impairment and confabulation.
Risk Groups for Thiamine Deficiency
Certain groups of people are at increased risk of thiamine deficiency:
- Individuals with chronic alcohol misuse
- People with malnutrition or a very restricted diet
- Patients after bariatric surgery (gastric bypass)
- People with chronic bowel diseases (e.g., Crohn's disease)
- Dialysis patients
- Older adults with reduced food intake
- Pregnant women with persistent nausea and vomiting (hyperemesis gravidarum)
Diagnostic Markers
Thiamine deficiency can be diagnosed using the following methods:
- Erythrocyte transketolase activity (ETK test): Considered the functional gold standard for assessing thiamine status.
- Thiamine in blood or urine: Direct measurement of thiamine levels in whole blood or plasma.
- Clinical presentation: Neurological and cardiovascular symptoms can indicate a deficiency.
Treatment and Supplementation
Thiamine deficiency is treated with targeted thiamine supplementation. In mild deficiency states, oral supplementation is often sufficient. In severe conditions such as Wernicke encephalopathy, intravenous or intramuscular administration of high-dose thiamine (e.g., 200–500 mg several times daily) is necessary to prevent permanent damage. Treatment should begin as early as possible.
Toxicity and Interactions
Because thiamine is water-soluble, any excess is generally excreted via the kidneys. Toxic effects from dietary sources are therefore very rare and largely unknown. At very high supplementation doses (above 100 mg daily), isolated cases of allergic reactions have been reported with intravenous administration. Interactions exist with certain diuretics (e.g., furosemide), which can increase thiamine excretion, as well as with raw fish and tea, which contain thiamine-degrading enzymes (thiaminases).
References
- World Health Organization (WHO): Thiamine deficiency and its prevention and control in major emergencies. WHO, Geneva, 1999.
- Lonsdale D.: A review of the biochemistry, metabolism and clinical benefits of thiamin(e) and its derivatives. Evidence-Based Complementary and Alternative Medicine, 2006.
- Institute of Medicine (US) Standing Committee on the Scientific Evaluation of Dietary Reference Intakes: Dietary Reference Intakes for Thiamin, Riboflavin, Niacin, Vitamin B6, Folate, Vitamin B12, Pantothenic Acid, Biotin, and Choline. National Academies Press, Washington D.C., 1998.
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Related search terms: Thiamine + Thiamin + Vitamin B1 + Aneurine