The overly loud eating you hear might have been overdubbed in post-production by foley artists (sound effects technicians). Read the closing credits at the end

The overly loud eating you hear might have been overdubbed in post-production by foley artists (sound effects technicians). Read the closing credits at the end of each show and you may find a foley artist was part of the production (and therefore the likely person who created recordings of simulated eating sound effects, to sync with the filmed visuals of the actors eating)