I enjoyed reading this thread's consistent, sensible comments. Seems we've turned a corner away from the crazy, unsustainable fad diets of the 80s into the 90s, and running miles while wearing a trash bag sweat suit before quitting..... and gaining all the weight back.
Changing one's dietary habits in a sustainable way, will achieve weight loss all on its own. Adding exercise is a bonus, and also brings its own set of benefits. In my early 50s, I shifted to calorie deficit to cut 25 lbs, and then hold in a calorie "maintenance" mode - somebody else mentioned that term, reference to "MyFitnessPal" website. That's what I use too.
Still enjoy doing a lot of cardio, running, and mild weight lifting (for tone/strength not body building), but walking, at a minimum, is a solid enhancement to the baseline strategy of a dietary life change. Don't forget the stretching, which is good to warm those muscles before a walk, and also brings mobility and flexibility benefits.
My Mom's a perfect example of the typical adult who never embraced fitness activity, so she has all sorts of aches & pains, couldn't touch her toes if her life depended on it. Chokes down a handful of pills every morning to mask the various symptoms of an in-active lifestyle.
My Dad, on the other hand, always a heavy, 250lb guy when I was growing up, transformed his dietary intake in his mid-60s with a guide program called "Fit for Life", along with modest exercise (walking, bike riding) and stretching/mobility. Results in 6-months, and within a year, his Doctor began weaning him off the litany of pills he'd been taking for decades. Mid to late 70s now, fit, active, looks great in a suit.
No fad diets and crazy stuff. Keep it simple, and consistent. It works.