これ以上食べられない。

this (indicating an item near the speaker, the action of the speaker, or the current topic); this person (usu. indicating someone in one's in-group); now; here; I (me); certainly

not less than; ... and more; ... and upwards; beyond ... (e.g. one's means); further (e.g. nothing further to say); more than ... (e.g. cannot pay more than that); above-mentioned; foregoing; since ...; seeing that ...; this is all; that is the end; the end

to eat; to live on (e.g. a salary); to live off; to subsist on