I eat healthy food because when I don't I feel worse physically. I exercise because when I do I feel much better both physically and psychologically. These are my only reasons, very simple. And my approach to the healthy food and exercising is also simple: they are parts of my life, but they don't define who I am or what I can or cannot do (If I want to eat cake - I eat cake).
I used to be a fan of all of those "best ways" of exercising, eating, etc., but then I grew up. There are so many things you should do "right" in order to live the "perfectly healthy" life that the entire idea is unreachable. Food and exercising are just a tiny part of what defines your life in terms of your health. You also need a perfectly clean air and water. You also need to avoid all kinds of stress (which causes more harm than the unhealthiest food imaginable), which means, for example, no football. You also need to avoid constant noise around you (did you know how bad the average city background noise is for your health?). And so on.
There are people who try to do all of this and even more. Unfortunately, usually they just have severe mental health issues that drive them into this "healthy living" escapism, so it's not about real health after all. Look at those who call themselves biohackers, people eat a hundred pills every day, which is worse than what people with the most severe illnesses do, but believe they are living the healthiest lives. But the level of psychological pressure they put themselves under easily erases everything good they could hypothetically get from that insane level of "healthiness" they aspire to reach.