The New Complete Book of Food
food chemists suggest that what makes the prune such an effective laxative is not its fiber
but another constituent, an unidentified derivative of the organic chemical isatin, which is
related to another natural substance, biscodyl, the active ingredient in some over-the-counter
laxative tablets and suppositories. Biscodyl is a contact laxative that induces the secretion of
fluid in the bowel and stimulates contractions of the intestines that push waste through the
colon more quickly and efficiently.
Protection against the risk of some forms of cancer. According to the American Cancer Society,
foods high in fiber and vitamin A may offer some protection against cancers of the gastroin-
testinal and respiratory tracts as well as cancers induced by chemicals.Adverse Effects Associated with This Food
Allergic reactions to sulfite. When they are dried, prune plums may be treated with sulfites
(sulfur dioxide, sodium bisulfite, and the like) to inactivate polyphenoloxidase, an enzyme
that hastens the oxidation of phenols in the prunes, forming brownish compounds that
darken the fruit. People who are sensitive to sulfite may suffer serious allergic reactions,
including potentially fatal anaphylactic shock, if they eat prunes treated with sulfites. Also,
prunes treated with sulfite compounds are high in sodium.
Diarrhea. Very large amounts of prunes, alone or with other high-fiber foods, may cause
diarrhea.Food/Drug Interactions
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