What contains whole milk, sucrose, nonfat milk solids, corn syrup solids, cream, guar gum, sodium hexametaphosphate, carrageenan, salt, imitation vanilla powder, sodium alginate, cellulose gum, dextrose, FD&C Yellow dyes Nos. 5 and 6?

Consumers will soon know that and other questions about fast food if the Center for Science in the Public Interest (CSPI), the New York State Consumer Protection Board and Food Allergy Committee of the American College of Allergists have their way. The three groups petitioned the Food and Drug Administration and the Department of Agriculture Monday "to lift the veil of secrecy from fast food."

"Consumers rely on ingredient disclosure to avoid substances to which they are allergic or that are linked to diet-related diseases," said Michael Jacobson, executive director of CSPI. "Without informative labeling, the composition of fast foods remains a mystery."

In the meantime, health-conscious eaters can learn more about their favorite fast foods in the June issue of CSPI's Nutrition Action.

The five worst for 1985: McDonald's Chicken McNuggets and breakfast sausage biscuit, Wendy's cheese-stuffed potato, Hardee's bacon cheeseburger and Roy Rogers' crescent sandwich with ham. The three best: Long John Silver's baked fish, Jack in the Box's shrimp and Wendy's low-calorie salad dressings. Honorable mentions go to Arby's roasted chicken breast and Wendy's multi-grain bun.

The product described at the beginning of this item, by the way, was a McDonald's vanilla shake.