Las proteínas son compuestos nitrogenados que desempeñan diversas funciones corporales: moléculas estructurales entre las que se encuentran las que forman huesos, ligamentos y tendones o las proteínas contráctiles del músculo; enzimas que catalizan casi todas las reacciones químicas del organismo; transporte de sustancias tales como hormonas, metales o fármacos; anticuerpos con un papel inmunitario; o combustible para la producción de energía, aunque con un papel menor que el de carbohidratos y lípidos.
Las proteínas están constituidas por un total de veinte aminoácidos diferentes y se pueden clasificar atendiendo a distintos criterios. Desde el punto de vista nutricional, nos interesa diferenciar los que son esenciales en la alimentación de los no esenciales.
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