These days I am fairly sure that it was never my lifestyle, it was always the pressure to eat what is considered a healthy diet and the foods conveniently available from the supermarkets.
I have not changed anything very much, except gone back to the low carb diet I have been talked out of so many times - I am now eating much the same as when I was in my 40s, and I feel the same as I did when I was in my 40s, and I am acting as though I am in my 40s. I have lost weight and gained energy - but that was after I sorted out my blood glucose, not before.