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Protein products for dieting may sport warning labels.

Legal skirmishing continues in the federal government's effort to require warning labels on "liquid protein" and other protein products intended for use in weight reduction or as diet supplements. Food and Drug Administration officials have been seeking the warning labels for three years ( JAMA [MEDICAL NEWS] 1977;238:2243-2244, 2680) after becoming concerned "about the rapidly growing use of liquid protein products that were being used as the primary or sole source of calories in low-calorie diets." Seventeen deaths have been attributed to use of these products. In the absence of supervision to ensure adequate potassium intake, hypokalemia is a possibility, the FDA has said. Cardiac arrhythmias may also occur ( N Engl J Med 1980;303:735-738). A regulation requiring the warning labels was to have gone into effect Sept 4, but a federal judge granted a stay to those opposing it. The FDA officials say the court has directed them "to do some more