Just like: Don't smoke, don't drink, work-out, take walks, spend time with your family and friends, don't work too much. Also, don't worry too much!
All the real problems come in practice.
Don't get me wrong, it's good to have a solid basis.
However, 80% of success comes from applying these things in your messy life.
For example what do I have for breakfast? Oh let's boil and egg amd grab a carrot and corn on the cob. Or whatever.
What do I do in the supermarket? Meats, veg, bit of fruit maybe bit of dairy. Am I obessing over avacado vs. pear. Nope. Chicken vs. beef? No. Chocolate bar vs carrot? easy choice.
Now probably once you get thay square you can do harder stuff like food reaction / allergy testing and so on.
I regularly see folks agonizing about every decision and new study, but the thing is.... the tips on OP's very basic list are responsible for like 80% of the value one gets from "living healthy".
All the rest of the organic whole grain horseshit and panicking about microplastics MIGHT net you another 10%, but at double the cost to your happiness.
The last 10% is basically impossible to achieve without completely sacrificing your quality of life.
Everyone knows that vegetables are good for you basically always.
Superfoods are just the latest marketing fad
The latest social media brain rot is that vegetables are bad for you.
Grifters in this space include Paul Saladino and Anthony Chaffee.
And those were before Facebook lol