Soy beans, which are white in color, have few tannins before fermentation. Perhaps after fermentation, the brown of the soy sauce indicates that these tannins are transformed into condensed tannins. A quick check of sour creams at the local supermarket shows that some brands contain the additive carob bean gum, a gum used as a stabilizer made from tannin- rich carob beans. Red wines are produced in a way that increases the tannin content. White wines, however, are produced in such a way that their tannin content is minimal.
White wines aged in wooden barrels, however, do pick up the tannins from the wood of the barrels.
The hops used in some beers contain high amounts of tannins. Although citrus fruits themselves do not appear to contain tannins, orange juices and orange-colored juices may contain food dyes that contain tannins. Many fruit drinks contain apple juice, which is high in tannins. Grape juices and berry juices are relatively high in tannins. As mentioned previously, red wine and some beers seem to be the big alcohol- containing migraine triggers.