Final answer:
The average human body is 16% protein because proteins are essential for many body functions, and dietary intake contributes to but does not solely determine body composition. The body synthesizes proteins and maintains its protein content through a balance of intake, breakdown, and synthesis.
Step-by-step explanation:
The question asks to explain how the average human body composition can be 16% protein despite an Egyptian diet consisting of only 10% protein intake. It's essential to note that dietary protein intake does not directly equate to the percentage of protein in the body. Proteins are essential nutrients composed of amino acids, which are the building blocks of body tissue and also serve as a fuel source. During digestion, dietary proteins are broken down into amino acids, which are then used for various functions in the body including protein synthesis, energy production, and storage as fat if in excess.
Proteins regulate body functions, build muscles and bones, help fight illness, transport substances in the blood, and transmit information between cells. Consuming protein provides amino acids needed for producing antibodies, muscle fibers, enzymes, and many other types of proteins. The body's protein content is maintained through a balance of protein intake, synthesis, and breakdown, not just through diet alone. Furthermore, protein comes from both plant and animal sources, contributing to both direct intake and synthesized proteins within the body.