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.
Protein provides four calories per gram. The human body can do three things with protein calories; put protein in fat stores, use it as an energy source or use it to carry out functions vital to life. Protein calories will be used as an energy source when the body is lacking fat or carbohydrate calories for fuel. When the body receives sufficient quantities of proteins, fats and carbohydrates, protein will carry out its specific functions.