"Eat food, not too much, mostly plants."

Even this seemingly simple advice can change depending on metabolism and exercise habits. As someone with a fast metabolism who exercises a lot, it's difficult to impossible for me to each too much whole/non-processed food. The more I eat (including meat/proteins, vegetables/fruit, carbs, fat, and non-junk food calories in general), the better and stronger I feel, both physically and mentally. My challenge is the opposite: if I'm not fairly disciplined about eating nutritionally dense foods every few hours during the day, I won't be at my best.

So for me it's more like "Eat food, as much as you can, with as much nutritional density and variety as possible".