Apple announced the iPhone 7 and iPhone 7 Plus on Wednesday, and they come in five gorgeous colors. The new design is water resistant and doesn't have a headphone jack. For the larger iPhone 7 Plus, Apple added a dual-lens camera system with a zoom lens.
Protein and Fat. Protein foods, such as meat or beans, are the next things your body metabolizes. The UCSB website says that the average metabolism rate for both is about 12 hours, but your body first uses the protein. Once all of those calories have been used, you begin to metabolize the fats.
So, how does the human body make ATP, the only fuel it can convert to energy? Our bodies have three different chemical systems that convert energy. Most everyone knows that we use proteins, carbohydrates and fats for energy. Calories are measurement of a unit of heat or food energy. For example, we can achieve four calories per gram of proteins and carbohydrates, and nine calories per gram from fats. But how do we convert these potential energy substances into ATP? This is where three energy systems come into play. Energy System 1: Ready fuel for immediate energy . The Immediate Energy system, or ATP-PC, is the system the body uses to generate immediate energy. The energy source, phosphocreatine (PC), is stored within the tissues of the body.