What it means: Most often this means the item has a third fewer calories than its full-calorie equivalent. When it refers to sodium or fat, it means the item has up to 50 percent less.
The health implications: If you’re watching calories, these foods can help (as can foods labeled “low calorie,” meaning 40 or fewer calories per serving). A healthy weight is linked to a lower risk of heart disease, diabetes, and some cancers.
Keep in mind: Sugar levels in these foods may be high, so check the labels.
Bottom line: When eaten in moderation, light foods can be good dieting tools.