Cookbook:Protein
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An essential part of organisms, proteins are made up of amino acids. Some amino acids can be synthesized by the human body while some must be obtained through food. Proteins are major contributors to cells' functions.
Protein is one of the nutrients that are needed in larger quantities (i.e. macronutrients) along with carbohydrates and fat. Proteins contain 17 kJ/g (4 cal/g) energy.
Sources of protein in the diet include nuts, legumes, grains, eggs, meats and dairy products. Proteins have a distinct behaviour in cooking compared to fats and and carbohydrates. Proteins in general stiffen when heated, for example a egg yolk becomes more solid when heated, because it's rich in protein.
Some proteins are toxic for humans but become edible via cooking, for that reasons some legumes must be boiled before they can be eaten.
[edit] External Links
See http://www.hsph.harvard.edu/nutritionsource/protein.html
