as natural as possible.
I think a „mixed“ nutrition is probably superior or mostly advantageous for the majority of people.
I wouldn’t be too strict in either direction, but pay attention to avoid sugar and processed foods, as well as seed oils.
Plant based is nothing bad - the contrary.
At the same time, we need #Cholin (best source: eggs) or #Leucin (Amino accid), which is best from animal sources/red meat…
It’s an incredible complex field, but probably your dad has done many things right 🙏🏽