The unsaturated fats are more desirable that the saturated. Proteins are made up of combination of amino acids. Animal sources of protein, such as meat, milk and eggs, contain the eight essential amino acids. Plant sources of protein such as beans, starchy vegetables, nuts and grains do not necessarily contain the essential amino acids. Vegetarian diets must be carefully planned to assure that the essential amino acids are consumed in sufficient quantities.
Vitamins are organic substances that are essential to the functioning of the human body.
Although vitamins do not contain energy that the body uses, vitamins are key substances that are needed for various processes. All of these vitamins play important role in the healthy functioning of the body. Vitamin supplementation is sometimes required to assure sufficient vitamins are being obtained. Minerals are inorganic substances that also perform important functions. These include calcium, phosphorus, potassium, sulfur, sodium, chloride and magnesium and many trace minerals including iron, zinc, chromium etc.