Eat with Caution

Why experts are wary of these six "healthy" foods

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Has there ever been a term harder to define than healthy food? Read a few labels and pretty soon it seems as if anything that doesn't flat-out kill you can call itself nutritious. But in most cases, things aren't so obvious. Here are some ostensibly good-for-you foods that diet specialists look at with a skeptical eye.

REDUCED-FAT PEANUT BUTTER

Taking out the fat sometimes means putting in artificial sweeteners. That can add up to a savings of just 0.5 g of fat and 10 calories per serving--along with a cloying flavor.

LOW-FAT YOGURT

It starts off fine, but as with its...

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