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Monday, July 18, 2005

'Unnatural' food

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Preservatives may maintain the condition of many tasty foods, but whether they preserve a person's health is another matter, says Demetre Whitmore, a registered dietitian at the Washington Cancer Institute at the Washington Hospital Center in Northwest.

"Nowadays, we are able to truck food from California to Maryland, and when it gets to the supermarkets, we are still able to eat it," Miss Whitmore says. "But it's better to eat more things that are fresh, more fresh fruits and vegetables, where nothing has been added."

Although modern food preservatives provide many benefits, experts still have questions about the full effects of the chemicals on the human body. Most doctors and nutritionists agree that eating fresh produce is healthier.

"I tell people to try to eat more whole foods so you don't consume so many preservatives," says Meg Martin, clinical nutrition manager at Inova Alexandria Hospital. "Even though preservatives have been shown to be safe, new information could show otherwise."

Because preservatives have been needed for many centuries, the technology involving them tends to be tried and true, says George Pauli, associate director for science and policy in the office of food additive safety in the U.S. Food and Drug Administration in College Park. He holds a doctorate in physical chemistry.

Companies haven't spent money on new preservatives in recent years because they already have sufficient ingredients, he says. Natamycin, which was approved by the FDA more than two decades ago, is one of the newest preservatives on the market. It inhibits mold and yeast growth and is commonly used in cheese.

In 1958, Congress passed the Food Additives Amendment to the Federal Food, Drug, and Cosmetic Act of 1938, saying that anything used in food needs FDA approval.

As a result, the regulatory category "generally recognized as safe" (GRAS) was created. Substances were added to the list if scientific experts considered them safe under the conditions of intended use. Items still can be added to the list if they qualify.

"It was a way of stating that there are some things that are so well-known that there is a consensus that they are safe to use, and the FDA doesn't have to review and approve them," Mr. Pauli says. "Once in a long while, when information or use changes, where the safety is no longer generally recognized, the FDA might revisit it."

In 1970, calcium cyclamate and other cyclamate salts formerly on the GRAS list were banned, Mr. Pauli says. They had been found to cause cancer in lab rats.

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