As a nutritional expert with a background in biochemistry, I can tell you that the importance of protein in our diet is paramount. Proteins are large, complex molecules that play a crucial role in the structure, function, and regulation of the body's tissues and organs. They are made up of amino acids, which are often referred to as the building blocks of life. Here's a detailed look at why protein is so vital for our health: 1. Tissue Building and Repair: Protein is essential for the growth and maintenance of body tissues. Hair and nails, as you mentioned, are mostly made of a protein called keratin. The body also uses protein to repair tissues that have been damaged due to injury or normal wear and tear. 2. Enzyme and Hormone Production: Proteins are involved in many of the body's chemical reactions. They act as enzymes, which are catalysts that speed up chemical reactions in the body. Additionally, proteins are used to produce hormones, which are chemical messengers that regulate a wide range of bodily functions. 3. Muscle Development: Protein is a key component of muscles. Regular intake of protein is necessary for muscle growth and strength, which is particularly important for athletes and those engaged in regular physical activity. 4. Bone Health: Protein is also important for bone health. It contributes to the formation of collagen, a protein that gives bones their flexibility and strength. 5. Cartilage and Skin: The structural integrity of cartilage and skin is maintained by proteins. Collagen, elastin, and other proteins are crucial for the elasticity and resilience of these tissues. 6. Blood and Immune Function: Proteins are a major component of blood, including the hemoglobin in red blood cells that carries oxygen to the body's tissues. They also play a role in the immune system, where they are part of antibodies and other immune system components that help fight off infections. 7. Energy: While carbohydrates and fats are the body's primary sources of energy, proteins can also be used for energy, especially during prolonged periods of intense exercise or when carbohydrate intake is low. 8. Transport of Nutrients: Proteins are involved in the transport of molecules and nutrients throughout the body. For example, proteins are essential for the structure of cell membranes and the transport of nutrients across these membranes. 9. Fluid Balance: Proteins help maintain the balance of fluids within the body by influencing the osmotic pressure of blood and other body fluids. 10. Regulation of Cellular Processes: Proteins are involved in the regulation of a wide range of cellular processes, including cell division, signal transduction, and apoptosis (programmed cell death). In summary, protein is an indispensable nutrient that plays a multifaceted role in the body's structure, function, and overall health. It is involved in virtually every aspect of human physiology, from building and repairing tissues to regulating complex cellular processes. read more >>

Hair and nails are mostly made of protein. Your body uses protein to build and repair tissues. You also use protein to make enzymes, hormones, and other body chemicals. Protein is an important building block of bones, muscles, cartilage, skin, and blood.read more >>