As a rule of thumb it will about double in volume (1/2 cup raw = 1 cup cooked). There's not any change in the amount of calories (unless you cook your oats in milk as noted above). It's traditional to add brown sugar and raisins to oatmeal.
1 Collagen is most commonly found within the body in the skin, bones and connective tissues. 2  The word collagen is derived from the Greek kolla, meaning glue. 3  Collagen gives the skin its strength and structure, and also plays a role in the replacement of dead skin cells.
Natural Sources of Collagen. Eggs are a natural source of collagen. Collagen is a type of protein that is used as connective and support tissue throughout the body. According to Human Biochemistry and Disease, collagen makes up 75 percent of our skin composition and 30 percent of our bodies overall. There are four types of collagen, although Type I receives more attention from the cosmetic industry because it is present in our skin, ligaments and bones.