Regarding the class comment, sure a access to some food is class based, but pretty much all westerners can afford basic "real food". I know because I've lived on minimum wage and could buy eggs, rice, beans, chicken thigh, etc.
Yes, obviously what we eat affects our health, I don't think that's ever been in dispute by any significant number of people (despite what the inbreds who love RFK Jr. seem to think), but part of the frustration is that they're acting that that can solely explain all chronic illnesses, ignoring things like air pollution (which they are actively deregulating).
Oh, also, RFK Jr. telling people to eat at Five Guys because they fry their fries in beef tallow is really dumb and is likely to lead to worse health outcomes.