On the Front of the Package

Calorie Free: Product must contain less than 5 calories per serving.
Low Calorie: Food contains no more than 40 percent of the calories in the regular version.
Reduced Calorie: Contains at least 25% fewer calories than the regular version. Depending on how many calories the original version had, this doesn't necessarily guarantee that the food is low in calories.
Fat free: Can only contain 0.5 grams of fat per serving.
Low fat: 3 grams of fat (or less) per serving.
Light: 50% less fat than its regular counterpart.Depending on how much fat the original version had, this doesn't necessarily guarantee that the food is low in fat.
Reduced fat: 25% less fat than regular version. Again, this doesn't necessarily guarantee that the food is low in fat.
High fiber: Good term to watch for! Indicates one serving has at least 5 grams of dietary fiber.
Good source of fiber: Food product has 2.5-4.9 grams of fiber per serving.
More or added fiber: Product has at least 2.5 grams of fiber per serving. Doesn't necessarily mean it is high in fiber.
Low sodium: Contains half the sodium of the original.
Sugar free: Less than 0.5 gram of sugar per serving.