Each gram of fat is 9 calories. Major sources of fat are milk, and meat. Protein forms enzymes , which create chemical reactions in the body. Just like carbohydrates, proteins have four calories per gram. Main sources that provide protein are meats, and milk products.
Amino acids are the building blocks of protein.
There are 20 amino acids overall, with 9 being essential, and 11 being nonessential. Essential amino acids must be obtained from the diet because the body cannot produce them. Nonessential amino acids are provided by the body. Click here to view the amino acids Vitamins are necessary for normal metabolism, growth, and development of the body. Vitamins must be obtained from the diet because they are not made in the body normally.