Which of the following are primary sources of protein in the diet?

The primary sources of protein in the diet are meat, dairy, eggs, legumes, and nuts. These food groups contain high levels of essential amino acids, which are the building blocks of protein necessary for various bodily functions, including muscle repair, immune function, and the creation of hormones and enzymes.

Meat, such as beef, chicken, pork, and fish, is a complete protein source, meaning it contains all nine essential amino acids required by the body. Dairy products like milk, cheese, and yogurt also provide high-quality protein. Eggs are another excellent source of protein, offering a well-rounded amino acid profile.

Legumes, such as beans, lentils, and peas, and nuts, including almonds, walnuts, and peanuts, are important plant-based sources of protein. While legumes may not always be complete proteins, they can be combined with grains or nuts to provide a complete amino acid profile.

Fruits and vegetables generally have low protein content compared to the groups mentioned, while grains and sugars primarily provide carbohydrates rather than significant amounts of protein. Oils and fats are primarily composed of lipids and provide little to no protein. Therefore, the correct choice encompasses food groups that are rich in protein and essential for a balanced diet.