This document discusses proteins, including their definitions, functions, excesses, deficiencies, sources of complete proteins, and the protein pyramid. It notes proteins are essential building blocks that provide amino acids and are commonly recommended at a minimum of 50 grams per day. Functions include structural support, enzymes, hormones, movement, storage, and transport. Excesses can cause issues if not balanced with nutrition and hydration. Deficiencies lead to various health problems over time. Complete proteins contain all essential amino acids and include meat, eggs, dairy, and soy.