If you're familiar with the phrase, "You are what you eat", you know the first step to staying healthy is to eat the right foods and know how much is enough. Along with exercise, a healthy diet can help you lose weight, increase your stamina, ward off illness and reduce health risks. Not only will you feel more energetic, but you're also likely to avoid long stays at the hospital. Chronic illnesses result in a whopping 2.5 billion days of missed work each year, according the Journal of Occupational and Environmental Medicine and result in half of the healthcare expenditures in the U.S. Take this quiz to learn more about how you can stay healthy. To read more about staying healthy, see NEWSWEEK's "Healthy Living for Every Age".