Carbs: Carbs are the best source of energy providing 34kj per gram and is found in candy, fruits and baked goods.
Fats: Fats are our second best source of energy providing 17kj, Unsaturated fats: These are found in plant foods and fish. These may be good for heart health when they're used in place of saturated and trans fats. Unsaturated fats are found in salmon, avocados, olives, and walnuts, and vegetable oils like soybean, corn, canola, and olive oil.
Proteins: 'High-quality proteins' such as eggs and meat offer more muscle-building amino acids than other protein foods, so are considered more valuable sources of protein, particularly if you do lots of exercise. Like simple and complex carbohydrates, proteins are absorbed at different rates in the body.