Carbohydrates are the main providers of energy in our diet. Every body cell, including the brain, requires a constant supply of glucose as fuel, most of which is provided by the carbohydrates in food and drink.
Most foods contain some carbohydrates, but foods containing the most include fruit, vegetables, bread, breakfast cereals, rice, pasta, legumes (chickpeas, lentils), milk, yoghurt and sugar.
Fry bread, for example, is roughly 30% carbohydrate and 60% saturated fat (the heart attack causing kind). Fry bread is a type of carbohydrate that is digested and absorbed into the blood very quickly, causing your blood glucose (sugar) level to rise rapidly. If you don't use this energy by exercising, your body stores the unused energy as fat.
There's nothing wrong with having tasty carbohydrate-rich food in your diet sometimes — but if you eat too much of it, your body can't use all the energy and stores it up. The energy goes into your liver to be changed into fat. Meanwhile, the saturated fat from over-indulging in yummy fry bread ends up in your arteries causing heart disease, diabetes and stroke.