Difference Between Complete Protein and Incomplete Protein

Protein is very important for our diet; it contributes to the overall development of the body. Every protein has a unique shape, size, and length as it is made up of amino acid and amino acid has several types and varieties.

Therefore they can be categories on the basis of types of amino acids and also on their chemical structure.

But to intake the protein, we must understand the food which contains complete and incomplete protein. As only then can you understand the combination of food you should intake to make a healthy balance of protein. Neither excess nor lack of any type of protein is good for the body.

Complete Protein vs Incomplete Protein 

The main difference between Complete Protein and Incomplete Protein is in the number of amino acids they have. While Complete Proteins has all the amino acids, incomplete does not have them all. They also differ in terms of their source and preference as not everyone eats animal products. Also, due to differences in amino acids type, they also have different health benefits.

Complete Protein vs Incomplete Protein

Protein with all essential nine types of amino acids in it are known as a complete protein. Animal and animal products such as meat and chicken are rich in this type of protein.

Milk is also a great source of this type of protein. They fulfill all the requirements of protein in our body, and therefore no extra protein is required if you’re intaking the complete protein-rich food.

Proteins that do not have all the required nine amino acids in them are called incomplete proteins. They are mostly found in plants products such as vegetables and fruits.

Combinations of incomplete protein-rich food are required to fulfill the requirement of protein in the body. This is mostly preferred by the people who are vegan and vegetarian.

Comparison Table Between Complete Protein and Incomplete Protein 

Parameters of ComparisonComplete ProteinIncomplete Protein 
Amino acidsContains all amino acidsDo not contain all amino acids
Found inAnimalsPlants
Health benefitsHave more health benefitsFewer health benefits
SourcesEggs, fish, meat, chicken, etcGrains, peas, nuts, etc
PreferredLess preferredMore preferred

What is Complete Protein?

Complete proteins are those with all the types of amino acids present in them. Well, most of them were made inside the body itself, but 9 types are not, which can only be intake by the food.

And all of them are present in the complete protein food. They are:

  1. Tryptophan
  2. Threonine
  3. Isoleucine
  4. Lysine
  5. Leucine
  6. Methionine plus Cristine
  7. Phenylalanine plus Tyrosine
  8. Valine
  9. Histidine

This type of protein is generally found in ammonals such as fish, meat, chicken, etc. not many vegetables have complete protein, but some do have it, including soybean and many more.

And the best example of this protein is milk which can be easily digested and have the maximum protein content in it. We all know how important protein is important for the body’s proper functioning.

For example, for mass gaining, complete protein food is the best source as they contribute the most to building the mass of the body.

Except for them, they also have some essential functions including, building up tissues and immune system, improve sleep, etc., except these have mostly disadvantages such as if there is a lack of protein in the body only complete protein can help it to maintain the balance.

complete protein

What is Incomplete Protein? 

These are the type of protein that does not have all the essential amino acids in them. They are not very beneficial to the body as compared to the complete protein are. A single food containing incomplete protein is not enough for the body.

The combination of food with different types of amino acids or incomplete protein can fill the need for protein in the body. A few examples of such combinations are:

  • Corn with beans
  • Yogurt with walnuts
  • Brown rice with green peas
  • Nuts with legumes
  • Legumes with seeds

This type of protein is generally founded in vegetable and plant products such as pulses, grains, etc.

The main and only advantage it has is that not all people eat animal products or animals in general (for example, vegetarian and vegan); therefore, they can eat an incomplete protein food, which is plants and vegetables.

Also, a recent study has shown that incomplete protein can also help in gaining mass or weight.

incomplete protein

Main Differences Between Complete Protein and Incomplete Protein 

  1. The main difference between a complete protein and an incomplete protein is the types and number of amino acids it contains, while as the name suggests, complete protein has all nine essential amino acids in it, incomplete proteins do not have all essential amino acids in it, that is required by the body.
  2. Complete proteins are mainly found in animals or their products, while most of the vegetables and their products have incomplete proteins in them.
  3. As mentioned above, complete protein has all the essential amino acids. Therefore, it has more health benefits such as for gaining mass, protein from animal-sourced food is recommended while incomplete proteins do have some benefits, but in comparison, they do not provide much development in the body as complete proteins.
  4. Also, a single food containing complete protein is enough for the body, while combinations of different food containing incomplete protein are required to fulfill the requirement of protein in our body.
  5. As the main source of complete protein is animals, vegetarian and vegan people avoid them, and hence they are less proffered in comparison to plant food with incomplete protein.
  6. Foods that contain complete protein are meat, chicken, fish, etc., and foods containing incomplete protein are grains, nuts, peas, etc.
Difference Between Complete Protein and Incomplete Protein


As we all know how much water is required for the body, and anything after water that is essential for the body is Protein. They perform several important functions in the body, such as repairing and building tissue, acting as enzymes and hormones, making the immune system strong, etc.

Lack of proteins can cause severe problems. In daily life also you can see the symptoms of this such as heavy hair fall, excess sleep, lack of energy, etc.

In any of these cases you should eat protein-rich food that can be, chicken, pulses, eggs, etc. and in case of some serious symptom doctor should be consulted immediately.


  1. https://www.nature.com/articles/nchem.2785?muraadminpreview&muraadminpreview&mobileformat=false
  2. https://www.nature.com/articles/323734a0
  3. https://www.worldscientific.com/doi/abs/10.1142/9789812799623_0039
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