For veg and meat I think it's mostly about the processing and preservation method; fresh is best, frozen is fine, canned is just okay for veg, unhealthy for fruit and meat. I've tried to cut back on the amount of canned goods we eat. I don't like food that's processed for instant microwaving either; it's hard to find microwave meals that are actually healthy and not just healthy in comparison to other microwave meals.
I also cut back significantly on starches, soda, white flour and sugar. I try to use fruit (natural juice or bananas) or honey or molasses as sweetener. I don't drink fruit juice because I think it's pointless to consume most kinds of fruit sugar without the fiber benefit of the fruit. I bake with chickpea flour as much as possible. I'm not sold on low-carb/keto as a full time diet but I can't deny the results so I try to strike a happy medium with carbs; quinoa, couscous, whole wheat pasta when possible, beans are okay too. Chickpeas are great.
No margarine ever; only butter, olive oil, grapeseed oil, and coconut oil.
I eat a lot of dark chocolate. I eat a lot of cheese. I save my bacon fat for frying. Bacon and sausage and tuna are probably the only heavily processed meats that I eat. I don't do cold cuts anymore, much as I miss them. Too much salt.
I wouldn't be at all surprised if all the good I was doing with my diet was balanced out by some of the bad. For every ten kale, pear, and craisin salads there's a bacon and cheese sandwich fried in fat.
But we do hold flavor in high regard, I won't eat anything that doesn't taste good. Lucky for me, most everything tastes good.