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Your body can synthesize most of the 22 amino acids that you need to make protein, with the exception of nine essential amino acids (histadine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine) that must come from your food. Fortunately, all unrefined foods have varying amounts of protein with varying amino acid profiles, including leafy green vegetables, tubers, grains, legumes, and nuts. All the essential and nonessential amino acids are present in these foods in amounts that meet or exceed your needs.

In the early 1900s, studies on rats suggested that they grew best when fed a combination of plant foods whose amino acid patterns resembled that of animal protein. That makes sense, as all baby mammals, rats and humans included, grow best when fed the perfect food for baby mammals: their mother's milk. The term "complete protein" was coined to describe a protein in which all eight or nine essential amino acids are present in the same proportion that they occur in animals. "Incomplete protein" described the varying amino acid patterns in plants. It's a misleading term, because it suggest that humans (and other animals, one would assume) can't get enough essential amino acids to make protein from plants.

Fortunately, the theory that plant proteins are somehow "incomplete" and therefore inadequate has been disproved. All unrefined foods have varying amounts of protein with varying amino acid profiles, including leafy green vegetables, tubers, grains, legumes, and nuts. All the essential and nonessential amino acids are present in any single one of these foods in amounts that meet or exceed your needs, even if you are an endurance athlete or body builder.

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Related Questions

Foods that contain all the essential amino acids are called?

complete proteins


Why are animals first class protein?

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.


What are the two types of protein?

The two main types of protein are complete proteins, which contain all nine essential amino acids, and incomplete proteins, which lack one or more of the essential amino acids. Complete proteins are typically found in animal sources, while incomplete proteins are usually found in plant sources.


What types of proteins do foods from animal sources provide?

Foods from animal sources provide complete proteins, which contain all essential amino acids needed by the body.


How are complete proteins important for your health?

Complete proteins are proteins that contain amino acids. Complete proteins are important for your health because amino acids help to form new proteins and to enhance biological functions in the body.


What makes vegetables the best source for essential amino acids?

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.


What is a protein group?

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.


What is the examples of proteins?

Foods that contain protein are grouped as either incomplete or complete proteins. Complete proteins contain all essential amino acids. Here are some examples of complete proteins:Fish: all fish are complete proteinsDairy Foods: cheese, milk, eggs are complete proteinsMeat: beef, buffalo, bison, chicken, lamb, pork, chicken, turkey and other meats are complete proteins..


Is nitrogen an essential component of proteins?

All proteins are compounds comprised of amino acids. Amino acids contain amine (-NH2) and carboxylic acid (-COOH) groups. Nitrogen is an essential component of the amine group in all proteins.


Plant proteins typically contain less than adequate amounts of what?

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.


What is the differrences betwen complete and incomplete proteins?

The number of essential amino acids it contains.


All animal proteins are classified as?

Animal proteins are classified as complete proteins because they contain all essential amino acids required by the body. These amino acids are necessary for various bodily functions, including muscle growth and repair.