If caught prior to irreversible complications, T2D is the poster child of the optional ailments. Just stop doing what caused it - a full time glycemic diet (grains, sugars, excess fruit), and dial down the industrial grain and legume oils to ancestral levels for extra credit (excess Omega 6 linoleic acid).
CGMs are now OTC in the US. Slap one on for a month and ‘diagnose’ the diet. Goal: keep BG below 100 mg/dL at all times, without meds. If on meds, stand by to unwind them to avoid hypoglycemia.
Of course, everyone knows what your saying...except doctors, or more specifically, doctors who want to keep their jobs.