Answer: B. False
The primary energy source for the body is carbohydrates, not proteins. While proteins can be converted into glucose and used for energy in situations where carbohydrates are not available, this is not their main role. Proteins are primarily used for building and repairing tissues, producing enzymes, and supporting immune function. It is more efficient for the body to use carbohydrates as its first choice for energy, as they can be quickly converted into glucose, which is the preferred energy source for cells, especially in the brain and during high-intensity exercise. Therefore, while protein can be used for energy, it is not the body’s primary source.