I don’t know if anyone in here needs to hear this, but: eat a variety of foods. Pay attention to how you feel after eating different foods, especially as you get older. Eat less of the ones that affect you negatively. Barring specic allergies, ignore fads and bullshit about seed oils, carbs, gluten, etc. Get some kind of regular exercise. This next part really sucks for some of us, but your genetics are the most important determining factor for your overall health and longevity. Enjoy your life the best you can.