Advertisement

Thiamin

Grains and Oats

What does it do?

Thiamin is a water-soluble B vitamin that helps your cells produce energy from carbohydrates. It is essential for the functioning of the heart, muscles and nervous system because it plays a role in conducting nerve impulses and in muscle contraction.

What are the best food sources?

Food sources of thiamin include enriched, fortified and whole-grain products, such as bread, rice, pasta, tortillas and cereals, and beef liver and pork.

What happens if you don’t get enough?

Early symptoms of thiamin deficiency include fatigue, weak muscles, anorexia, weight loss and mental changes, such as confusion or irritability. As deficiency becomes more severe, it can result in a disease called beriberi, which is characterized by severe cardiovascular and nervous-system complications including cardiac failure in infants. Beriberi, which is most often observed in developing nations, was referred to in Chinese medical texts as early as 2700 B.C. (though at the time they didn’t make the connection between diet and disease).

Thiamin deficiency is rare in industrialized countries, where it usually only occurs in chronic alcoholics. In alcoholics, thiamin deficiency can progress to beriberi or Wernicke-Korsakoff syndrome, a disease most commonly a result of alcohol-induced malnutrition.

What happens if you get too much?

It’s not likely that you will experience adverse effects from consuming too much thiamin; your body absorbs less thiamin at intakes above 5 mg and excretes any amount it considers excess. Although documentation of adverse effects from excess thiamin is limited, this does not mean there is no potential for harmful effects, so stay within the range of recommended intakes.

How much do you need?

The following table lists the recommended intake for healthy people based on current scientific information.

Life Stage Group Age Range Recommended Dietary Allowance/Adequate Intake Tolerable Upper Intake Level (UL)
Infants 0-6 mo. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Infants 7-12 mo. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Children 1-3 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Children 4-8 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Males 9-13 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Males 14-18 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Males 19-30 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Males 31-50 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Males 51-70 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Males > 70 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Females 9-13 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Females 14-18 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Females 19-30 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Females 31-50 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Females 51-70 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Females > 70 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Pregnancy < 18 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Pregnancy 19-30 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Pregnancy 31-50 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Lactation < 18 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Lactation 19-30 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
Lactation 31-50 yr. Not determinable due to lack of data on adverse effects and concern about inability to handle excess amounts. Source should be from food only to prevent high levels of intake.
20 minute dinner recipes
Advertisement
more smart savings
Advertisement
20 minute dinner recipes
Get a full year of EatingWell magazine.
World Wide Web Health Award Winner Web Award Winner World Wide Web Health Award Winner Interactive Media Award Winner