I don't think they were suggesting it was good lifestyle/eating via being able to afford a good doctor for that advice - but rather check-ups and early diagnoses. You could run a large battery of tests every x weeks if you wanted, if you were unsure about a mole you could skip the GP and have a top oncologist review it immediately, etc.

I expect though that that sort of money enables existing hypochondriacs (in the casual sense) like that, but that most billionaires etc. are no more inclined to have unnecessary tests from unnecessarily specialised doctors than the rest of us.