Vitamin B1 Deficiency: Causes, Symptoms, and What to Expect

Vitamin B1, also called thiamine, is one of the eight B vitamins. It helps the body convert carbohydrates, fats and proteins into energy and supports the normal functioning of cells, nerves and the heart.

Although thiamine is present in many foods, deficiency can develop when dietary intake is inadequate, the body cannot absorb enough of the vitamin, or its requirements increase. Severe, prolonged deficiency can cause beriberi and may also affect the nervous system.

Why Vitamin B1 is important?

Thiamine plays a vital role in energy metabolism. Since thiamine is water-soluble, the body stores only small amount of it. This means regular consumption is required.

Thiamine naturally occurs in certain food items and can be also added to some fortified products. Some of the best food items rich in vitamin B1 you can include in your diet are:

• Whole-grain foods
• Fortified bread, cereals, rice and pasta
• Legumes, such as beans and lentils
• Corn and corn-based foods
• Nuts and seeds
• Enriched egg noodles
• Yoghurt

What causes vitamin B1 deficiency?

A lack of thiamine may result from inadequate intake, poor absorption or increased nutritional requirements. Common contributing factors include:

• Poor or inadequate diet
• Heavy or frequent alcohol consumption
• Prolonged vomiting
• Malabsorption or certain gastrointestinal conditions
• Bariatric surgery
• Chronic diarrhoea
• Increased nutritional needs, such as during pregnancy
• Certain medical conditions that affect nutrient absorption or use
• Long-term use of some medications
• Eating a diet very high in refined carbohydrates without enough thiamine-rich foods.
• Severe calorie restriction or prolonged fasting

Symptoms of Vitamin B1 deficiency you should not ignore

Early symptoms can be quite general, which means they may be mistaken for other health problems. Possible signs include:

• Loss of Appetite and Weight Loss: Reduced appetite and unexplained weight loss can occur when thiamine levels are inadequate. Fatigue Since thiamine is involved in converting food into energy, deficiency may contribute to tiredness and reduced energy levels.

• Irritability and Mood Changes: Some people with thiamine deficiency may experience irritability, poor memory or other changes in mental functioning.

• Tingling or Numbness: A more severe deficiency can affect peripheral nerves, causing tingling, burning sensations, numbness, muscle weakness or pain, particularly in the legs and feet. The arms may also become affected as the deficiency progresses.

• Muscle Weakness: Thiamine deficiency can affect muscle function and may cause weakness, cramps or difficulty with movement.

• Confusion and Memory Problems: Severe deficiency can affect the brain and may result in confusion, memory problems and difficulty with coordination. In some cases, it can lead to Wernicke encephalopathy or Wernicke-Korsakoff syndrome, particularly in people with alcohol dependence.

• Heart-Related Problems: Severe thiamine deficiency can affect heart function and, in some cases, lead to wet beriberi, which may involve a rapid heartbeat, swelling and heart failure.

Who is at higher risk of Vitamin B1 deficiency?

Thiamine deficiency is uncommon when the diet is varied and provides adequate nutrients. However, the risk may be higher among people who:

• Have alcohol dependence
• Are older adults with poor or insufficient dietary intake
• Have had bariatric surgery
• Are living with HIV/AIDS
• Have diabetes
• Have gastrointestinal disorders that interfere with nutrient absorption
• Experience persistent vomiting
• Have prolonged inadequate nutrition
• Have certain health conditions that raise the body's need for thiamine or interfere with how it is utilised

Can Vitamin B1 deficiency be prevented?

Thiamine deficiency is uncommon when the diet is varied and provides adequate nutrients. However, the risk may be higher among people who:

• Older adults who do not get enough nutrients from their diet
• People with bariatric surgery
• Individuals living with HIV/AIDS
• People with diabetes
• Those with gastrointestinal disorders that may reduce nutrient absorption
• Individuals experiencing persistent vomiting or diarrhoea
• People affected by prolonged inadequate nutrition
• Those with medical conditions that increase thiamine needs or interfere with its utilisation

When to consult a doctor?

Thiamine deficiency can sometimes develop gradually, and its early symptoms may not be specific. If you have persistent fatigue, appetite or weight changes, tingling or numbness, muscle weakness, confusion or other unexplained symptoms - particularly if you have a known risk factor - speak with a doctor.

Your doctor may assess your diet, symptoms, medical history and risk factors and decide whether further testing or treatment is appropriate. Thiamine deficiency is treated with thiamine, with the route and dose depending on the severity and clinical situation.

FAQs

1. What are the noticeable signs of low vitamin B1?

The common symptoms of low vitamin B1 include fatigue, loss of appetite, and a tingling or numb sensation in the hands and feet.

2. What fruits are found to be rich in B1 nutrient?

Fruits usually do not contain high amounts of vitamin B1. However, durian, dried bananas, and tamarinds are among the fruits that contain relatively higher amounts of thiamine.

3. What causes Vitamin B1 deficiency?

Thiamine deficiency can occur due to poor dietary intake, heavy alcohol consumption, certain health conditions, or problems with nutrient absorption.

4. Who needs vitamin B1 nutrient the most?

Individuals with heavy alcohol dependence, older adults, or those who have recently undergone bariatric surgery may have a higher risk of vitamin B1 deficiency.

Sources:

https://nutritionsource.hsph.harvard.edu/vitamin-b1/

https://www.ncbi.nlm.nih.gov/books/NBK537204/

https://en.wikipedia.org/wiki/Thiamine