It's latent autoimmune diabetes in adults. It generally starts with characteristics of type 2 and type 1 and generally proceeds in time to needing insulin. I developed mine 2 years ago at 50 though looking back I can now see its progression. Meals , carbs and protein and everything kept getting smaller to maintain good control Exercise started raising me rather than lowering me. Then there was huge fast weight loss. Overnight fasting went from mid 80 s to 250 and nothing I did brought it down.