Lucerne Skim Supreme Fat Free Milk

What it is: A fat-free milk with an additive that makes it look and taste thicker.

What's the additive? Carrageenan, a seaweed extract used in many processed foods as a thickener or stabilizer.

Is this the only thickened fat-free milk? No. Some other brands of skim milk, such as QFC Fortified Fat Free Milk with Calcium and Protein, also add carrageenan. A hint of this additive's possible use may be a term such as "supreme," "premium" or "fortified" in the name. Any additives are also listed in the ingredients.

What's the advantage? The additive eliminates the blue, watery look typical of skim milk and gives it a thicker mouth feel that might appeal to people who normally dislike nonfat milk. It does this without adding fat or calories.

Any down side? Some studies have linked large amounts of carrageenan to colon cancer in laboratory animals, though scientists note this doesn't prove a similar risk in humans. Carrageenan has FDA approval. The Center for Science in the Public Interest, a consumer watchdog group, says of this additive, "The small amounts in food are safe."

Anything else added? Like many brands of milk, this one also adds vitamins A and D.

Judith Blake, Seattle Times staff writer