"This oft-repeated claim may stem from genuine confusion over a term commonly applied to chewing gum: indigestible. Although gum resists the body's efforts to break it down (hence the 'indigestible' designation), it does not linger in the stomach. Gum is eliminated as human waste in the same way — and at the same rate — as any other swallowed matter. Granted, it comes out the far end relatively unchanged by the trip, but it does come out on schedule.
Though parental cautions against swallowing something which was meant to have the flavor chomped from it and then discarded might account for part of the warning's spread, the greater part can likely be attributed to the nature of the substance itself. Chewing gum is quickly worked into an unchanging mass in the mouth that, unlike foodstuffs, barely gets smaller no matter how hard or how long we chew it. Its resistance to being broken down by the teeth works to support the fanciful notion that it has special properties which allow it to lurk in the digestive system year after year. Moreover, since we know we're not supposed to swallow gum, imagination kicks in, inventing a "reason" for this prohibition since the obvious one — that it's not food — lacks an appropriate sense of mystery.
And food it's not. About 15% to 30% of chewing gum is gum base, a natural or synthetic indigestible rubbery substance that makes the treat resilient to hours of jawing. Vegetable-oil derivatives can be added to keep gum soft. Glycerin maintains moistness. Sorbitol and mannitol add sweetness to sugarless gum, and mannitol is often used to dust the gum, along with starch. Artificial and natural flavorings, colorings, preservatives, sugar, saccharin or corn syrup, can also be added.
We come by our desire to chew gum quite naturally. Chewing the resin of trees is an ancient habit, so in that sense, our gum chewing habit has probably always been with us. It took a canny businessman, however, to turn an ordinary rural practice into an indulgence that didn't depend on one's having a sap-dripping tree handy. In 1848, John Curtis of Hampden, Maine, observed loggers chewing spruce resin, and from that sight extrapolated the potential for a lucrative business. He boiled the resin, skimmed it, poured it, cooled it, rolled it, cut it, dusted it with cornstarch, and wrapped it. The gum was priced at a penny for two pieces (which in those days was a not-insignificant sum). Thus was born State of Maine Spruce Gum, the first commercially marketed chaw. Other companies followed, but the paper industry used up too many trees to leave a steady supply of spruce resin for the gum manufacturers, and the industry faltered.
A key event in the history of chewing gum involved the notorious Mexican General Antonio Lopez de Santa Anna, the very man who ordered the taking of the Alamo and had all its defenders put to death. Santa Anna introduced chicle, a rain-forest tree resin, to New York inventor Thomas Adams with the idea of marketing chicle as a rubber substitute. That was not to be, but this particular resin turned out to be more useful as a chewing-gum base. Today the Adams name still appears on boxes of Chiclets. "
Source(s):
Snopes.com
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