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1992-12-06
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Vitamin B1
U.S. Recommended Daily Allowances
Infants Children Adults and Pregnant or
(0-12 mo.) (1-3 years) Children 4 Years + Nursing Women
0.5 mg 0.7 mg 1.5 mg 1.7 mg
(The U.S. RDA amounts are sufficient to meet the needs
of practically all healthy people.)
Thiamin (vitamin B1) is a water-soluble vitamin that
was the first identified member of the TB complex group.
Functions: Helps convert carbohydrates to energy; aids
in nerve cell functioning.
Sources: Brewer's yeast; lean cuts of pork;
whole-grain or enriched cereal grain products; legumes;
liver, heart and kidneys; nuts and seeds.
Deficiency: Thiamin deficiency causes beriberi, a
disease whose symptoms include anorexia, weakness, lack of
coordination, muscle wasting, paralysis of the eye muscles,
mental confusion, rapid heartbeat, edema, and enlarged
heart. Deficiency is sometimes seen in this country in
people with alcoholism and certain medical conditions.
Excess: High intakes appear nontoxic since excess
thiamin is easily excreted by the kidneys.