How many people can even afford to get multiple opinions for a weird lump on their back? Or go to the dentist for a strange toothache? How many people can afford to get consistent exercise and eat healthy? How many lives would be saved or at least massively bettered? We already have the means to extend the life expectancy of the average person, and it's not being used. Obviously this is a wonderful medical advance, but it's depressing to wonder who it's for.
Everyone could afford to "eat healthy" and get exercise if governments and social planners put in a modicum of effort. Unfortunately they aren't directly incentives to do so.
Framing either of these things as a wealth issue ignores both how wealthy even the poorest in the world are and the systems responsible for the problem. For everything else there's health insurance, yet another horribly mismanaged system.