A cook knows that a flame can be present without cooking a pot evenly. That observation gives an English reader a foothold in agni, the image of fire used in Ayurvedic discussions of digestion and transformation. The comparison is useful precisely because it makes an invisible process imaginable.
Trouble begins when a translation quietly changes a metaphor into a measurement. An account of agni is not a reading of stomach acid or a laboratory result. Nor can a reader infer the cause of persistent pain from a description of a weak flame.
Compare two sentences in your notes: “The writer describes digestion through fire” and “My digestion feels different after this meal.” The first concerns a text; the second is a personal observation. If the change is troublesome, take the second sentence, together with its timing and other symptoms, to a clinician. You do not need to convert it into Sanskrit to make it useful.
Further reading: Indian perspectives on Ayurveda (NEIAH)