In the amino acid composition and the ratio of our digestive tract to the digested food. Plant food is more scarce in terms of the set of amino acids, unlike animal food. It is necessary to search for 100% of the amino acid composition in animal food, and in plant food only soybeans reach 70-80%. This is why vegetarians need to carefully plan their diet.
Dietary proteins can be categorized into animal and vegetable proteins. Animal proteins are found in meat and poultry, fish and seafood, eggs and dairy products, and vegetable proteins are found in soybeans, cereals, legumes and nuts.
Unlike animal proteins, vegetable proteins have an incomplete set of essential the human body of essential amino acids (isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, valine, histidine), i.e. are defective.