Milady Esthetics State Board Practice Test

Which type of food contains all essential amino acids?

1. Carbohydrates

2. Fats

3. Proteins

4. Vitamins

The correct answer is: Proteins

The correct answer is proteins because they are composed of amino acids, which are the building blocks needed for numerous physiological functions in the body. Essential amino acids are those that the body cannot synthesize on its own and must be obtained through the diet. Complete proteins, such as those found in animal products like meat, fish, dairy, and also in some plant sources like quinoa and soy, contain all nine essential amino acids in sufficient quantities required by the body. In contrast, carbohydrates and fats do not contain amino acids, as they serve different functions in nutrition. Carbohydrates primarily serve as a source of energy, while fats provide energy storage and support cell function, among other roles. Vitamins are organic compounds necessary for various biochemical processes but do not provide amino acids or act as protein sources. Therefore, proteins are uniquely important for supplying essential amino acids that contribute to muscle repair, immune function, and the synthesis of hormones and enzymes.