Thiamine (Vitamin B1): Functions, Needs and Deficiency
Thiamine, also known as Vitamin B1, is an essential water-soluble vitamin required for energy metabolism and proper nerve function in the human body.
Wissenswertes über "Thiamine"
Thiamine, also known as Vitamin B1, is an essential water-soluble vitamin required for energy metabolism and proper nerve function in the human body.
What is Thiamine?
Thiamine (also spelled thiamin; commonly known as Vitamin B1 or aneurine) is a water-soluble vitamin belonging to the B-vitamin family. It was the first vitamin ever to be identified and remains essential for human health. Since the body cannot produce thiamine on its own, it must be obtained through the diet every day. In the body, thiamine is converted into its active form, thiamine pyrophosphate (TPP), which serves as a coenzyme in numerous metabolic processes.
Biological Functions
Thiamine plays several vital roles in the human body:
- Energy metabolism: As a coenzyme, thiamine is essential for converting carbohydrates and amino acids into usable energy. It is required for the breakdown of glucose into ATP (the body's energy currency).
- Nervous system: Thiamine is crucial for the normal function of nerve and muscle cells and supports the transmission of nerve impulses.
- Heart function: The vitamin contributes to healthy heart muscle activity.
- Pentose phosphate pathway: Thiamine participates in the pentose phosphate pathway, a metabolic route important for the synthesis of nucleic acids (DNA and RNA).
Dietary Sources
Thiamine is found in a wide variety of foods, though usually in modest amounts. Particularly rich sources include:
- Whole grain products (e.g., whole wheat bread, oatmeal)
- Legumes (e.g., lentils, peas, beans)
- Pork and organ meats
- Nuts and seeds (e.g., sunflower seeds)
- Potatoes and vegetables
- Fortified foods such as breakfast cereals
Important note: Thiamine is heat-sensitive and water-soluble. Prolonged cooking or soaking can significantly reduce the thiamine content of foods.
Recommended Daily Intake
Recommended thiamine intake varies by age, sex, and life stage. According to the World Health Organization (WHO) and national health authorities, the following daily reference values apply:
- Adult men: 1.2 mg per day
- Adult women: 1.0 mg per day
- Pregnant women: 1.2 mg per day
- Breastfeeding women: 1.4 mg per day
- Children (depending on age): 0.2–1.1 mg per day
Requirements increase with heavy physical labor, fever, chronic illness, and high carbohydrate consumption.
Thiamine Deficiency
Causes
A thiamine deficiency commonly arises from:
- Poor or unbalanced diet (e.g., exclusive consumption of polished white rice as a staple food)
- Chronic alcohol abuse (the most common cause in industrialized countries)
- Gastrointestinal disorders causing malabsorption
- Increased requirements (e.g., pregnancy, fever, intense physical activity)
- Long-term use of certain medications (e.g., diuretics)
Symptoms
A thiamine deficiency can affect multiple organ systems:
- Early symptoms: Fatigue, irritability, difficulty concentrating, loss of appetite
- Nervous system: Tingling and numbness in the hands and feet (peripheral neuropathy)
- Cardiovascular system: Rapid heartbeat, fluid retention (edema), heart failure
- Severe deficiency: Beriberi (dry or wet form) and Wernicke encephalopathy (associated with alcoholism)
At-Risk Groups
People at particular risk for thiamine deficiency include those with chronic alcohol use disorder, elderly individuals with a poor diet, patients who have undergone bariatric surgery, pregnant women, and those with chronic gastrointestinal disorders.
Diagnosis
A thiamine deficiency can be identified through several methods:
- Measurement of thiamine concentration in the blood (whole blood or red blood cells)
- Assessment of erythrocyte transketolase activity (a functional marker of thiamine status)
- Clinical evaluation based on symptoms and medical history
Treatment and Supplementation
When a thiamine deficiency is confirmed or in high-risk individuals, supplementation may be appropriate or necessary. Treatment depends on severity:
- Mild deficiency: Oral thiamine supplements (e.g., tablets or capsules)
- Severe deficiency (e.g., Wernicke encephalopathy): High-dose intravenous thiamine administration in a hospital setting
- Dietary changes: Increasing consumption of thiamine-rich foods
Because thiamine is water-soluble, any excess is excreted by the kidneys. Toxicity from dietary intake has not been reported. In rare cases, high-dose intravenous administration has been associated with allergic reactions.
Interactions
Thiamine absorption and effectiveness can be influenced by several factors:
- Alcohol impairs intestinal absorption of thiamine and increases its renal excretion.
- Diuretics (water pills) can increase thiamine loss through urine.
- Raw fish and certain shellfish contain thiaminases, enzymes that break down thiamine.
- Tea and coffee may slightly reduce thiamine absorption when consumed in very large quantities.
References
- World Health Organization (WHO): Thiamine deficiency and its prevention and control in major emergencies. WHO/NHD/99.13, Geneva 1999.
- National Institutes of Health (NIH), Office of Dietary Supplements: Thiamin - Fact Sheet for Health Professionals. Available at: ods.od.nih.gov (2023).
- Lonsdale D. - Thiamine and magnesium deficiencies: keys to disease. Nutrients. 2015; 7(5): 3465-3501. PubMed PMID: 25961314.
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Related search terms: Thiamine + Thiamin + Vitamin B1 + Aneurine