。
A full stomach is as good as a feast.
Literal
Fullness [topic-は] feast [even-も] equivalent.
A proverb with compressed, aphoristic form. も同然 ('as good as,' 'practically the same as') is a set phrase used to claim near-equivalence. No verb or copula — just noun + も同然. Carries the ことわざ flavor of saying something profound in very few words.