Some years ago I was amongst a large group of people who went from typical western diets onto a centrally prepared ration of, well, food. Cooked recognisable ingredients, and zero (as in, not any) fast food. Over the first week or so our sweat noticeably stank, but from then on wasn’t unpleasant at all, even though the environment was equitorial hot.
Either we just got used to each others stank, or once the processed food and salts and nitrates had passed through us we just smelt better. Given that the groups before and after us reported the same effect, I remain inclined to go with the second explanation.
