Which of the following is a food source high in complete proteins?

Complete proteins contain all nine essential amino acids that the body cannot synthesize on its own. Animal products such as meat, fish, eggs, and dairy are excellent sources of complete proteins because they provide a balanced profile of these essential amino acids in adequate amounts. This makes them particularly important for growth, muscle repair, and overall health.

In contrast, fruits and vegetables do provide some protein but typically lack one or more essential amino acids, making them generally considered incomplete protein sources. Whole grains also contain protein but are often deficient in certain amino acids, such as lysine. Nuts and seeds, while nutritious and a good source of protein, do not provide all essential amino acids in sufficient quantities to be classified as complete proteins. Therefore, animal products stand out as the highest source of complete proteins among the options presented.