Like fat, you need a certain amount of calories in your diet to fuel your body. Teens come in all sizes and each person's body burns energy calories at different rates, so there isn't one perfect number of calories that every teen should eat. Choose a variety of foods to eat, including vegetables and fruit, whole grains, low-fat dairy, and protein foods. Pay attention to when you feel hungry and stop eating when you feel full.
Your body needs calories to operate — to keep your heart beating, your lungs breathing, and your brain thinking. Your muscles use calories to move. Being active every day keeps your body strong and can help you maintain your weight. Eating more calories than your body needs can lead to being overweight and other health problems. If you are concerned about your weight, speak to your doctor.
Reviewed by: Mary L. Gavin, MD. Larger text size Large text size Regular text size. What Are Fat and Calories? Food Labels: Calories Food labels list calories by the amount in each serving size.
Serving sizes differ from one food to the next, so to figure out how many calories you're eating, you'll need to do three things: Look at the serving size. See how many calories there are in 1 serving. Multiply the number of calories by the number of servings you're going to eat.
The calories in food come from carbohydrates, proteins, and fats: A gram of carbohydrate has 4 calories. A gram of protein has 4 calories. A gram of fat has 9 calories — more than twice as much as the other two. Not All Fats Are the Same All types of fat have the same amount of calories, but some fats are better than others.
A 30g serving of dried fruit counts as 1 of your 5 A Day, whereas an 80g serving of fresh fruit, such as grapes or cherries, counts as 1 of your 5 A Day. These all count towards your 5 A Day , which should include a variety of fruit and vegetables. Vegetables are generally low in calories, while bringing the added benefits of fibre, vitamins and minerals. Remember, this page is only intended as an illustration. All foods vary in energy content and this can depend on how they're made or prepared, and how much you eat.
Most prepackaged foods have a nutrition label on the side or back of the packaging, which will give a guide to the energy content. Get advice on counting calories in non-packaged foods, such as loose fruit and vegetables or fresh bread.
Read about understanding calories for more information about energy values in food. Page last reviewed: 23 July Next review due: 23 July What does calories look like?
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Calories are the energy in food. They fuel everything you do, from sleeping to running a marathon. Your body can use them to fuel work right away, or store them for later use. Some calories can be stored as glycogen carbs , but the majority is stored as body fat.
What Is Body Fat? For starters, body fat is not just pure fat. Bottom Line: Body fat is mixed with fluid and protein. In general, we can assume that : One pound equals grams. Pure fat contains 8. However, it is important to note that these calculations are based on old research. Bottom Line: A pound of body fat may contain anywhere between 3, and 3, calories, roughly estimated. The Calorie Deficit Myth.
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