Alas, I don't have any structured plan. Other people on these threads are way stricter about eating 'clean' and taking an array of supplements. My diet goal is to do what I think of as Eating Like an Adult, which means a lot more fresh, organically-grown, non-GMO vegetables, lean meats (Buffalo cheeseburgers are an exception) and proteins, only bovine-growth-hormone-free dairy (and usually as yoghurt). My concession to health is to at start the day with a veggie/fruit/yoghurt/protein supplement
/unpasteurized almonds smoothie. If I do that, the diet falls into place for the rest of the day. If I don't, donuts look appealing. The insulin/glycogen chemistry system is beyond me but I can feel when I ate wrong.

I do some yoga as it just feels great but skip anything that feels too unnatural. Plan to add tai chi as it looks boring (just to me) so us probably a good discipline and very beneficial. (There's some non-apparent logic in that thought, lol.) Otherwise, exercise is walking and fast walking on the treadmill set at varying levels of incline. Walking on a non-inclined surface is harder due to old lower back injury.

The best diet advice, I think, is the writer Michael Pollan's, to paraphrase, "Eat a wide range of good quality food, not too much, as fresh and unprocessed as possible."