Carbohydrates are the most important source of energy for your body. Your digestive system changes carbohydrates into glucose, which your body uses this sugar for energy for your cells, tissues and organs. It stores any extra sugar in your liver and muscles for when it is needed. They can be simple, such as sugar found in fruits, vegetables, and milk or complex, such as whole grains, and starchy vegetables.
Protein is in every cell in the body, it is needed to build and maintain bones, muscles and skin. We get proteins in our diet from meat, dairy products, and nuts. Proteins from meat and other animal products are complete proteins, which all of the amino acids the body can't make on its own. Protein needs to be eaten every day, because your body doesn't store it.
Fat has twice as many calories as proteins or carbohydrates. Fats give you energy and help your body absorb vitamins, and also affect the level of cholesterol in your body. There are saturated, such as butter, shortening, and lard and trans fats, such as margarine, cookies, processed snack foods, and foods made with hydrogenated oils.
Video explaining which foods have which macronutrients
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Carbohydrates are the most important source of energy for your body. Your digestive system changes carbohydrates into glucose, that your body then uses this sugar for energy in your cells, tissues and organs.