> I see everywhere the focus is on obesity.
That’s because so many T2 diabetics are actually obese.
Without a bit more info from you it’s a bit difficult to give advice, but here’s some basic info: if you want to stay at your current weight then you must eat at maintenance. Figure out your TDEE (you’ll have to google this yourself because I’m on mobile), then eat enough when not fasting so that you don’t have a caloric deficit over the period including your fast. This is applicable whether doing IF or longer fasts. As long as your average calorie intake for the period meets or exceeds your TDEE you’ll be fine.