At the grocery store, shoppers confront a dizzying array of labels promoting whole grains, reduced fat, antioxidants or vitamins. Some foods are said to be “Smart Choices,” while others are a “Sensible Solution.”

Stephen Crowley/The New York Times
Dr. David L. Katz promotes his nutrition rating system. Two other groups are creating their own food scoring systems.
Amid the confusion, how can consumers tell whether Cheerios, say, are better or worse than Special K? Is light mayonnaise more nutritious than regular? Which are worse, Nilla Wafers or Chunky Chips Ahoy?

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