Generally a protein molecule consists of around 20 essential amino acids.
complete proteins
Vegetables are not the best source for essential amino acids because they do not contain all the essential amino acids in sufficient amounts. Animal sources like meat, fish, eggs, and dairy products are considered complete proteins because they contain all the essential amino acids in the right proportions.
Navy beans do not contain all essential amino acids in sufficient quantities to be considered a complete protein. While they are a good source of protein and provide several essential amino acids, they are low in methionine. To obtain all essential amino acids, it is beneficial to combine navy beans with other protein sources, such as grains, which can complement their amino acid profile.
Animal proteins are considered "first class" or "high quality" proteins because they contain all the essential amino acids required by the human body in the right proportions. This makes animal proteins more easily digestible and more readily absorbed compared to plant proteins. Additionally, animal proteins tend to have higher biological value, meaning they provide a more complete source of amino acids for human nutrition.
There are two groups of protein. Proteins from animal foods contain all the essential amino acids in the proportions required by the body they are therefore known as "complete" or 1st class protein. Protein from plants do not always contain all the essential amino acids, and are known as "incomplete" or 2nd class proteins.
Foods from animal sources provide complete proteins, which contain all essential amino acids needed by the body.
Plant proteins typically contain less than adequate amounts of all essential amino acids, particularly lysine and methionine. Consuming a variety of plant protein sources throughout the day can help ensure a complete amino acid profile.
The term "complete protein" refers to amino acids, the building blocks of protein. A protein must contain all nine of these essential amino acids in roughly equal amounts.
meat
Amino acids
Foods such as meat, fish, eggs and dairy products contain all the essential amino acids. However plant sources of protein only contain a few of the amino acids needed.
Corn is not considered a complete protein because it does not contain all nine essential amino acids in sufficient amounts. While it is a good source of carbohydrates and some protein, it lacks lysine, which is essential for protein synthesis. To achieve a complete protein profile, corn can be combined with other protein sources, such as beans or legumes, which provide the missing amino acids.