With a potential 20% margin of error, nutrition labels aren’t as reliable as we think — The U.S. Food and Drug Administration (FDA) requires that a nutrition facts label be present on all packaged foods and beverages. The nutrition facts label provides the Recommended Daily Allowance (RDA) for the fat, cholesterol, sodium, carbohydrates, fiber, sugars, carbohydrates, and protein content in a particular food or beverage item…