We are all aware of the benefits of proteins and their importance in our diet especially when it comes to muscle building and fitness.
But why does it so happen that we often prefer a source of protein over the other?
The answer is the quality of protein, whether the protein is complete or incomplete protein.
The major difference between the complete and incomplete proteins in the presence of amino acids in the food.
Protein is made up of amino acids. there are certain amino acids that our body can make while certain amino acids that cannot be made by our body. The ones that cannot be made by the body are called essential amino acids and should be made available through diet while the ones that can be made by the body are called non-essential amino acids.
A complete protein contains all essential amino acids and hence possesses a much higher utilization rate compared to the incomplete protein sources. Histidine, Isoleucine, Leucine, Lysine, Methionine, Phenylalanine, Threonine, Tryptophan, and Valine are the 9 essential amino acids that are available in complete protein or complete protein sources.
All types of protein derived from animal sources are complete sources of protein. Milk, curd, cheese, red meat, fish, eggs, paneer are all complete sources of protein.
Proteins that do not contain all the essential amino acids that are required by our body as they cannot make it and are hence called incomplete proteins. Most plant sources are sources of incomplete proteins leaving aside a few which contain all the 9 essential amino acids.
The calories derived from such food sources also have the calories from carbs and hence become difficult to use when you are looking at consuming pure protein. Most grains, nuts, seeds, nut butter, green peas and legumes are sources of incomplete proteins.
In case you are vegetarian, a combination of complete and incomplete proteins should be able to help you meet your daily requirement while a non-vegetarian can rely on complete protein sources to fulfill his daily nutritional requirement.