The six main types of nutrient are carbohydrates, fats, minerals, protein, vitamins, and water. A macronutrient is a nutrient that needs to be eaten a lot. A micronutrient, such as a vitamin, is needed in smaller amounts, but it is still important. Carbohydrates are not needed by the body but most people eat a lot of them. Complex carbohydrates are more nutritious than simple carbohydrates. Complex carbohydrates are found in vegetables while simple carbohydrates are found in processed foods. They take longer to digest because they have more fiber. Because they stay in the stomach for longer they leave the person who has eaten them feeling fuller for longer. Protein is needed for building cells. It is found in milk, meat, fish, beans, eggs and other foods like quinoa. Protein is made of amino acids.