This is true for a LOT of health stuff people get freaked out about nowadays.
Heart disease isn’t really a problem (for you) if you die of a fever at age 3, or die in childbirth at 25, or you shit yourself to death because of food poisoning or cholera or parasites because we don’t have germ theory or sanitation yet, and clean drinking water was - no pun intended - kind of a crapshoot. Or you get an infection, but antibiotics haven’t been invented yet. Or you cut yourself, and it goes septic. Or there was a famine and you starved to death.
“We didn’t used to have all these food allergies!” - I mean, we absolutely DID, but if you have a severe reaction in an era without epinephrine or antihistamines, you’re usually just dead.
Be really skeptical when people insist “We didn’t used to have [insert disease here]!” (and therefore it’s a conspiracy, or some kind of consequence of our decadent modern living, and you need to spend money on [insert trendy diet here] etc etc) because yeah, we PROBABLY did, it’s just it was less of a concern when half of people died before they reached adulthood.