ALL FOOD provides energy for our bodies. Calories are energy. The pound calorie is the amount of energy required to raise the temperature of one pound of water by 1 °C. A calorie is a measurement of energy. When you eat food its all about how efficient the energy is. obviously eating something that is just fried carbs (like a donut) will not be as beneficial as eating an orange which contains vitamins and natural sugars.
but all food provide energy (that is how we stay alive)
There are four general categories of compounds that provide calories, which, like keithplya9 mentioned, are how we measure energy for our bodies. These four categories are: fats, carbohydrates, protein and alcohol. The first three are talked about frequently yet it seems to be not as common knowledge that alcohol also is a source of calories (aside from the carbohyrdates alcoholic drinks contain). What we normally call “food” contains some combination of these 4 category yet the concentration of energy (in calories) varies per category: fats contain 9 calories per gram, alcohol contains 7 cal/g, carbs and protein both contain 4 cal/g. However food provides us with more than just calories (e.g energy); it also provides us with essential amino acids (from protein) as well as vitamins and minerals. So, while all food contains energy, you can’t just any type of food and be able to lead a healthy life. You have to ensure that you are fulfilling all of your daily requirements. Malnourished is a term used to refer to people that consume enough calories but don’t consume a healthy balance of the vitamins, minerals and amino acids necessary for a healthy body.
Food energy can vary greatly from person to person, though there are some generalities. Almost any nutritionist will tell you to dose up on fruits and vegetables, then add in some protein (primarily through nuts and seeds). Which types of anything from above you choose should be specific to you, since there are many people who exhibit allergies unique to themselves and the food. Eating foods you are allergic to can zap a lot of your energy. Allergy symptoms can be subtle, like an itchy throat or ears, dark undereye circles, and a mucousy development that occurs when the cells coat themselves to ward off the allergen.
All calories provide the body with energy. Some of those calories, like the ones found in starchy foods, are used quickly then stored inconveniently in the body as fat. Other calories, like those found in complex carbohydrates, fruits and veggies, are more useful and contain more nutrients for our good health. Regardless, anything containing calories, which is most food, gives us energy.
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