For such a universal activity, eating can be pretty confusing. Grocery stores are crowded with nutritional jargon -- think: organic, vegan, enriched, local and GMO-free -- and it's hard to know what's a legitimate health claim and what's merely a smart bit of marketing. For example, Americans bought $43 million worth of foods labeled "natural" last year. But according to a Consumer Reports survey, two-thirds of Americans don't understand the term correctly.
So how well do you know the nutrition basics? Test your knowledge below: