Where are complete proteins primarily found?

Complete proteins are those that contain all nine essential amino acids that the body cannot synthesize on its own. Animal foods such as meat, dairy, and eggs are rich sources of these complete proteins, as they provide the full spectrum of essential amino acids needed for optimal bodily function. In addition to animal-based sources, soy products also constitute complete proteins, making them an excellent option for individuals who follow vegetarian or vegan diets.

Fruits and vegetables are generally less reliable sources of complete proteins, as they usually lack one or more essential amino acids. Grains and legumes, when consumed separately, typically do not provide all essential amino acids but can complement each other to form complete proteins when eaten together. Processed foods may contain proteins, but these are often of lower quality and may not provide the complete amino acid profile necessary for building and repairing tissues effectively.

Thus, the correct choice highlights the main sources of high-quality, complete proteins that are critical for nutrition and overall health.