Except you can do all that (have always done that) and still be struck down with run-away inflammation, and without being some obvious genetic outlier.
What you are describing is nowhere near the cure-all that unsymptomatic bystanders assume it is.
You may also get hit by a car or get struck by lightning. Nothing is a guaranteed cure-all but what the GP describes is probably a good idea for a lot of people.
What you are describing is nowhere near the cure-all that unsymptomatic bystanders assume it is.