Nutrition can be complicated. How do you know what foods are healthy and what aren't? How much should you eat? What's a healthy portion size? How many calories do you need? Do you weigh just the right amount--or are you underweight or overweight? Keeping track of how much you eat, weigh, and exercise can help you make the right choices. Discover how knowing the numbers--calories, BMI, weight, and more--is a big part of staying fit and healthy.
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