A small explanation to make you understand things better, when a person ingests food to fuel the body, the digestive and metabolic process of the body breaks food into a kind of ash which is either acidic or alkaline
This involves pumping for 20 minutes, resting for 10, pumping for 10, resting for 10, and pumping for a final 10 minutes
But in some cases, an underlying medical condition can cause a particular mouth odor
[38] [43] Throughout her career, Callas displayed her vocal versatility in recitals that juxtaposed dramatic soprano arias alongside coloratura pieces, including in a 1952 RAI recital in which she opened with "Lady Macbeth's" letter scene, followed by the "Mad Scene" from Lucia di Lammermoor , then Abigaille's treacherous recitative and aria from Nabucco , finishing with the "Bell Song" from Lakm capped by a ringing high E in alt (E6)