What is the difference between complete and incomplete proteins?

Sindujaa D N
Complete and incomplete proteins are two distinct categories used to characterize the amino acid composition of proteins and their dietary origins. These classifications hold significance due to their impact on the nutritional value of the proteins we incorporate into our diets. Complete proteins, often termed high-quality proteins, encompass all nine essential amino acids in adequate quantities. 

These essential amino acids are pivotal for a range of bodily functions and must be sourced from our diets since our bodies cannot produce them independently. Common sources of complete proteins include animal-derived products like meat, fish, poultry, eggs, and dairy. These sources provide a well-rounded and abundant reservoir of essential amino acids, simplifying the task of fulfilling our protein and amino acid requirements.


In contrast, incomplete proteins, also known as low-quality proteins, lack one or more of the essential amino acids. Most plant-based protein sources fall into this category, including legumes, grains, nuts, and seeds. While these foods contribute significantly to our protein intake, they may be deficient in specific essential amino acids. 


Nonetheless, by adopting a diverse dietary approach that combines various plant-based protein sources, individuals can still obtain the full complement of essential amino acids they need. This strategy, known as protein complementation, involves merging complementary incomplete protein sources to create a comprehensive amino acid profile.

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