We’ve all heard of products being labeled “artificially flavored” or “naturally flavored,” but ever wonder what exactly “natural flavor” means? Is it really natural? What is the difference? Well, the definition of “natural flavor” under the Code of Federal Regulations is: “the essential oil, oleoresin, essence or extractive, protein hydrolysate, distillate, or any product of roasting, heating or enzymolysis, which contains the flavoring constituents derived from a spice, fruit or fruit juice, vegetable or vegetable juice, edible yeast, herb, bark, bud, root, leaf or similar plant material, meat, seafood, poultry, eggs, dairy products, or fermentation products thereof, whose significant function in food is flavoring rather than nutritional” (21CFR101.22). Any other added flavor therefore is artificial. (For the record, any monosodium glutamate, or MSG, used to flavor food must be declared on the label as such). Both artificial and natural flavors are made by “flavorists” in a laboratory by blending either “natural” chemicals or “synthetic” chemicals to create flavorings....

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http://www.supermarketguru.com/page.cfm/6046

For those of you interested in avoiding toxic food additives, genetically modified foods, MSG, etc., I definitely recommend the following documentary:

Sweet Remedy

These are the same people who created the excellent documentary about NutraSweet (Aspartame) poisoning:

Sweet Misery