Biologically complete proteins primarily come from which food source?

Biologically complete proteins are those that contain all nine essential amino acids in sufficient quantities to support bodily functions, such as tissue repair and muscle building. These proteins are predominantly found in animal sources, which provide high-quality protein that the body can readily utilize. Animal products like meat, dairy, eggs, and fish deliver these complete proteins effectively.

In contrast, plant-based sources, such as vegetables, fruits, and grains, typically do not provide all essential amino acids in balanced amounts. While some plant foods can be excellent sources of protein, they may lack one or more of the essential amino acids or provide these amino acids in insufficient quantities, making them incomplete proteins. Therefore, animal-based foods are recognized for their ability to deliver biologically complete proteins, making them crucial in a diet focusing on protein quality and availability.