Hola! Estoy buscando el equivalente para 'extracorporeal nutrition' en el siguiente contexto, ¿alguna opción?

The gastrointestinal (GI) tract is composed of a diverse set of organs that together receive extracorporeal nutrition and convert it to energy substrates and cellular building blocks. In the process, it must sort through all that we ingest and discriminate what is useable form what is not, and having done that, it discards what is "junk".