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Vitamin
B1 (Thiamin) occurs in both plant and animal
tissues. It is a vital element in the body's production of energy through the
breakdown of carbohydrates, and it takes part in other metabolic reactions. It
also appears to be necessary for normal functioning of the nervous system and is
involved in the action of the heart. Beriberi is a thiamine deficiency disease.
Vitamin B1 is water-soluble and is sensitive to heat.
Vitamin B1 plays a key role in the body's metabolic cycle for generating energy; aids in the digestion of carbohydrates; essential for the normal functioning of the nervous system, muscles & heart; stabilizes the appetite; promotes growth & good muscle tone.
A deficiency of Vitamin B1 may lead to the loss of appetite; weakness & feeling tired; paralysis & nervous irritability; insomnia; loss of weight; vague aches & pains; mental depression & constipation; and/or heart & gastrointestinal problems.
The lists of plants following are two kinds: quantitative and alphabetical. The quantitative list presents plants and plant products containing significant amounts of the nutrient involved, in approximate order from highest to lowest content for a given weight. Plants marked with an asterisk (*) contain significantly more of the nutrient than do the unmarked plants. Those marked with a double asterisk (**) contain considerably more than those with a single asterisk. Unless otherwise noted, all items are fresh and unprocessed. Dried fruits are often included without their fresh equivalents because the dried versions weigh considerably less and therefore contain more nutrients than the same weight of fresh fruit.

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