Avoiding Surcharges. Because airlines charge a peak travel day surcharge on the most popular days of travel -- Sunday, Monday and Friday -- you can get the best discounts on those off-peak days. However, during the summer, peak and off-peak travel days do not really exist.
Proteins are essential nutrients for the human body. They are one of the building blocks of body tissue, and can also serve as a fuel source. As a fuel, proteins contain 4 kcal per gram, just like carbohydrates and unlike lipids, which contain 9 kcal per gram.
And, this brings us to the first important function of protein, which is to provide structure. Structural proteins make up integral parts of your body. For example, keratin is a type of protein found in your hair, nails and skin that helps give these structures strength. Inside your body, protein provides structure to every cell.