Michael Pollan highlighted some rules for eating since he famously has been quoted for saying, "Eat food, not too much, mostly vegetables."
He welcomed suggestions for eating well. I'm particularly struck by the Japanese home cook's credo of the five colors, five preparations, and five flavors. I've recently added pickled vegetables to my Asian meals, and it does add another dimension.
I liked also ending with fruit. I didn't realize it was also an Italian habit, but in my family we always end with that light sweet note. It works as a signal that the meal is finished.