From the body's perspective, protein is certainly extremely important. Mulder discovered that proteins are a major component of all plant and animal tissues, second only to water. Today we know that these intricately constructed molecules are vital to many aspects of health and play an integral role in every living cell. Our bodies constantly assemble, break down, and use proteins, so we count on our diet to provide enough protein each day to replace what is being used. When we eat more protein than we need, the excess is either used to make energy or stored as fat.
Most people associate protein with animal foods like beef, chicken, fish, or milk.
However, plant foods such as dried beans and peas, grains, nuts, seeds, and vegetables also provide protein. Many protein-rich plant foods are also rich in vitamins and minerals. These plant foods usually are low in fat and calories. People living in poverty may suffer from a shortage of both protein and energy in the diet. When the diet lacks protein, the body breaks down body tissue such as muscle and uses it as a protein source.