"The breath becomes very foul and remains so during most of the fast, gradually becoming less so as the work of purification proceeds, until, with the return of hunger, it is sweet and clean. The more foul is a man's body, the more foul will be his breath and the more heavily coated his tongue."
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and since smell and taste are so linked, wouldn't such breath have the ecatone smell too? I'm just asking for some further clarification, about the smell being "a danger signal".