For the first time ever, I've put on about 10 lb that I wish weren't there. It's mostly snacky eating that's done it, together with half a bottle of wine twice a week and a shedload of delicious Lindor chocolates (lots of offers round Christmas and the months afterwards = woe is me!). I prefer fresh vegs and homecooked food, so no issues there. My life/activities have been little changed in the last ten years, so it's not activity levels.
I've given up buying chocolates and cut back on the vino. I think the increase is halted, maybe even reversing slowly.
A friend who was told he has pre-diabetes and had got to around 215-220 lb was sent by his doc on a diabetes awareness course, which he found really helpful. By watching carbohydrates, he managed without any difficulty to lose 30-35 lb and is now fitter and gets up hills much easier than he did 40 years ago. He found this "Carbs and Calories" book extremely helpful: Carbs & Cals Books | Carb & Calorie Counter Book (carbsandcals.com) You can get it through Amazon and probably many other sources as well. It's quite useful, not preachy, shows photos on standard sized plates, dishes or spoons of common foods in different portion sizes, and also shows substitutes, giving the carb count for each photo.
Another friend who has been overweight for years and has tried quite a few diets, unsuccessfully, is now doing very well with Noom. She says she's never got this far before. She has a number of medical issues that can affect her weight. This Noom plan apparently addresses the psychology behind eating - what, when, and how - rather than calorie-counting or similar. Noom: Stop dieting. Get life-long results.