The great majority of zombie miniatures are by convention and necessity monstrous, rotted and demonic caricatures. This is after all what we're paying for however the horde would certainly contain a good few who had died from a scratch, heart attack or other invisible cause and turned before they could be eaten.
Some of the Apocalypse Survivor 'average Joe' heads are well detailed and quite characterful and fit nicely on the Studio Minis plastic torso, giving you a relatively healthy looking specimen.
A range of sickly pallors should prevent these guys from looking too buff.
The normality of these characters should help to dilute the fantasy aesthetic a little while lending the more 'horrific' sculpts some context and credibility. Also, easy bonus zombies!!