Overview & Description
Thiamine, also known as Vitamin B1, is a water-soluble vitamin. It was the first vitamin to be discovered. Thiamine is one of eight members of the vitamin B complex. The complex also includes:
vitamin B2
niacin
vitamin B6
vitamin B12
folate
biotin
pantothenic acid
Because thiamine is water-soluble, any extra is passed out of the body in the urine. Thiamine is needed each day to maintain health.
men from 15 to 50 years = 1.5 mg
men over 50 years = 1.2 mg
women from 11 to 50 years = 1.1 mg
women over 50 years = 1.0 mg
pregnant women = 1.5 mg
breastfeeding women = 1.6 mg
Thiamine is common in foods. A balanced diet based on the Food Guide Pyramid should provide enough thiamine daily.
A disease called beriberi, which affects the nerves and heart, is caused by a lack of thiamine in the diet. This is extremely rare in the United States, because enriched grain products are so common. Before grains were enriched, it was much more common.
Mild thiamine deficiencies are more common. Exceptions may be found with chronic alcoholism, fasting, the elderly, and chronic dieting. Symptoms usually show up in the nerves, stomach, and heart. Early warning signs include:
fatigue and weakness
loss of appetite and weight loss
stomach upset and nausea
confusion and irritability
depression
poor memory
sleep disturbances
chest pain
irritation
abdominal discomfort
constipation
If deficiency continues, symptoms can get worse, and some damage can be permanent. This can include damage to the heart, and changes to the nervous system.
There is little chance of getting too much thiamine, even when it is taken at high doses. Because it is water soluble and not stored in the body, it is not likely to build up to toxic levels. In older people with low levels of thiamine, taking vitamin B1 pills has improved their lives by decreasing both blood pressure and weight.
In isolated cases, however, thiamine toxicity has occurred from injections or concentrated formulas used with hospital patients. Toxicity symptoms include nervous irritability, headaches, insomnia, and a rapid pulse.
Because thiamine is water-soluble, any extra is passed out of the body in the urine. Thiamine is needed each day to maintain health.
Information
Daily needs for thiamine are based on the amount of calories taken in each day. The recommended daily allowances, called RDAs, for thiamine are based on 0.5 milligram (mg) for every 1,000 calories consumed. Based on the recommended calorie intake for men and women at certain age levels, the RDAs for thiamine are:Thiamine is common in foods. A balanced diet based on the Food Guide Pyramid should provide enough thiamine daily.
A disease called beriberi, which affects the nerves and heart, is caused by a lack of thiamine in the diet. This is extremely rare in the United States, because enriched grain products are so common. Before grains were enriched, it was much more common.
Mild thiamine deficiencies are more common. Exceptions may be found with chronic alcoholism, fasting, the elderly, and chronic dieting. Symptoms usually show up in the nerves, stomach, and heart. Early warning signs include:
If deficiency continues, symptoms can get worse, and some damage can be permanent. This can include damage to the heart, and changes to the nervous system.
There is little chance of getting too much thiamine, even when it is taken at high doses. Because it is water soluble and not stored in the body, it is not likely to build up to toxic levels. In older people with low levels of thiamine, taking vitamin B1 pills has improved their lives by decreasing both blood pressure and weight.
In isolated cases, however, thiamine toxicity has occurred from injections or concentrated formulas used with hospital patients. Toxicity symptoms include nervous irritability, headaches, insomnia, and a rapid pulse.
Functions and Sources
What food source is the nutrient found in?
Thiamine is found in foods such as:Enriched products add back the vitamins that are lost when grains are processed. Thiamine is lost in cooking due to heat. The thiamine contents of some foods are:
How does the nutrient affect the body?
Thiamine works with the other B vitamins to change protein, carbohydrate, and fat to energy. It is especially vital for changing carbohydrates to energy. It is a key factor in the healthy functioning of all the body's cells, especially the nerves.Attribution
Author:Kimberly Tessmer, RD, LD
Date Written:
Editor:Crist, Gayle P., MS, BA
Edit Date:09/26/02
Reviewer:Kathleen A. MacNaughton, RN, BSN
Date Reviewed:09/26/02
Somer, E., MA, RD. & Health Media of America. (1995). The Essential Guide To Vitamins and Minerals (2nd ed.). New York: HarperCollins Publishers, Inc.
Murray, M., ND. (1996). Encyclopedia of Nutritional Supplements. California: Prima Publishing.
Duyff, R., MS, RD, CFCS. (1996). The American Dietetic Association's Complete Food & Nutrition Guide. Minnesota: Chronimed Publishing.
Anderson, J., MS and Deskins, B., PhD, RD. (1995). The Nutrition Bible. William Morrow and Co., Inc.
Hoyumpa, A.M. (1980). Mechanisms of thiamine deficiency in chronic alcoholism. American Journal of Clinical Nutrition, Vol 33, 2750-2761.
Wilkinson, T.J., et al. (1997). The response to treatment of subclinical Thiamine deficiency in the elderly. American Journal of Clinical Nutrition, Vol 66, 925-928.
Date Written:
Editor:Crist, Gayle P., MS, BA
Edit Date:09/26/02
Reviewer:Kathleen A. MacNaughton, RN, BSN
Date Reviewed:09/26/02
Sources
Murray, M., ND. (1996). Encyclopedia of Nutritional Supplements. California: Prima Publishing.
Duyff, R., MS, RD, CFCS. (1996). The American Dietetic Association's Complete Food & Nutrition Guide. Minnesota: Chronimed Publishing.
Anderson, J., MS and Deskins, B., PhD, RD. (1995). The Nutrition Bible. William Morrow and Co., Inc.
Hoyumpa, A.M. (1980). Mechanisms of thiamine deficiency in chronic alcoholism. American Journal of Clinical Nutrition, Vol 33, 2750-2761.
Wilkinson, T.J., et al. (1997). The response to treatment of subclinical Thiamine deficiency in the elderly. American Journal of Clinical Nutrition, Vol 66, 925-928.
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