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Calories are the energy found in food that helps the body do everything from sleep to running. The calories in food can come from carbs (starch), fat, and protein. The body can use calories to fuel activities or store it for later use as body fat.
1. What are calories?
Calorie (English name is calorie) is a unit of energy and is used to measure. Calories in food are not only numbers but also a unit that reflects the amount of energy in food. Your body needs energy (measured in calories) to fuel all of its daily functions. Powering your body is often compared to the way you power your car. When supplying gasoline to your vehicle, your vehicle already has energy stored in the tank. But gasoline alone is not enough to make the car move, fuel must be burned in the engine to release energy from gasoline in order for the car to run. Similarly, the food (fuel) that you eat has energy in the form of calories found in proteins, fats, and carbohydrates. Food needs to be digested and metabolized to release energy so that it can be used to fuel the body. Calories are essential for life. Your resting metabolic rate (the number of calories your body uses each day for the most basic processes just to stay alive) accounts for about 75% of the calories your body uses each day. The remaining calories that you burn during the day are used to fuel muscles, when moving and exercising. And a very small amount of calories are used for the digestion of food.
Thực phẩm cung cấp năng lượng cho các hoạt động của con người
2. How to calculate food calories?
The main sources of calories in food are proteins, fats, and carbohydrates.
One gram of protein contains 4 calories. One gram of carbohydrates contains 4 calories. Fat is a more concentrated source of energy: Each gram of fat contains 9 calories of energy. Example: If you look at the nutrition facts, one serving of french fries has 7 grams of fat, 17 grams of carbohydrates, and 2 grams of protein for a total of 140 calories. The formula will calculate as follows:
Fat has 9 calories/gram, 7 grams fat x 9 = 63 calories. Carbohydrate has 4 calories/gram, 17 grams carbohydrate x4 = 68 calories. And 2 grams of protein has 8 calories. Add up all the calories (63, 68, and 8) for a total of 139 calories (nutrition sheet rounded off).
Mỗi một loại thực phẩm sẽ có hàm lượng calo khác nhau
3. Calories in each food
3.1 High Calorie Foods Foods that are considered high in calories: Examples are oils, butter and other fats, fried foods and sugary sweets which are high calorie foods.
Healthy foods high in calories include avocado (227 calories each), nuts (828 calories per cup of peanuts), olive oil (119 calories per tablespoon), dark chocolate (648 calories per bar) ).
Raisins are a high-calorie food that may surprise some people; You can eat a cup of fresh grapes and get the same calories as 1/4 cup of raisins.
3.2 Low-calorie foods Low-calorie foods are low in calories for their size. Fruits and especially vegetables are usually relatively low in calories.
