I'm not a native speaker and am finding it hard with how many qualifiers one needs to put into English sentences as to avoid looking like one is making sweeping absolute statements. Is this also necessary for verbal communication?
To fully pad out what I meant with that sentence:
... where I assume that most people doing that type of heavy physical labor were, on average, quite likely to have had very plain diets when compared to what a lot of laymen in modern days would deem/assume sufficient for developing such a physique in modern times.