Came to post this exact comment! It's the subtitle of Michael Pollan's 2008 book In Defense of Food. Simple and easy to follow. Doing physical exercise a few times a week also helps.
I'm not sure I'd trust a food activist to arrive at nutritional truths. I'd rather listen to someone with scientific background: https://www.diagnosisdiet.com/foods/
Grains are a plant, and people on average eat far too many processed grains, and too few fruits and vegetables. I like the simplicity in this statement, but it leaves too much open to interpretation. Let's not have people feeling good about themselves because everything in a PopTart comes from a plant, for example.
https://en.wikipedia.org/wiki/In_Defense_of_Food