What is contained in egg whites?

Egg whites, also known as albumen, are primarily composed of water and proteins, making protein the most significant component. The content of egg whites is about 90% water and 10% proteins, which include essential amino acids necessary for muscle repair and growth. The proteins found in egg whites contribute to its ability to create structure in various dishes, such as meringues and soufflés, where the egg whites are whipped to create a light and airy consistency.

While egg whites do contain trace amounts of various nutrients, the predominant and most noteworthy component is indeed protein. They do not contain substantial amounts of carbohydrates, fats, or vitamins. Therefore, the focus on protein as the main nutrient in egg whites supports the answer that correctly identifies albumen as the key component.