"I think that animal proteins provide essential nutrients that you are able to get in a unique package of foods for, let's say, about 200 calories -- a three ounce serving of meat, " Rodriguez said.

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Retailers could mention nutritional facts that a three-ounce serving of eye-round roast has just slightly more fat than a skinless chicken breast, for example.

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The kid with the slushie in Tucson before the three-ounce-rule?

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The American Heart Association has recommended a consumption goal of no more than 450 kilocalories of sugar-sweetened beverages -- fewer than three 12-ounce cans of carbonated cola -- per week, the report says.

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He also noted that Monster's labels say people should drink no more than three 16-ounce cans a day, which is nearly five times the maximum daily caffeine limit recommended for children by the Food and Drug Administration.

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It is difficult to say how many licensed coin dealers are telling their customers they don't have what they need, but earlier this year, Ute Wartenberg-Kagan, executive director of the American Numismatic Society, said she was asked by an investor how one could buy 10, 000 coins (they are sold in ounce quantities and three fractional versions below that, at a price that is slightly above market value).

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It's also a mere three grams (0.11 ounce) lighter.

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