High cholesterol can be genetic. The US cannot change its genetic profile, which includes a lot of big boned individuals.
Far more than a super majority of those with high cholesterol are due to lifestyle. At my least yearly doctors appointment I asked about the genetic case. My doctor, in his mid-40s, said he had only had a few patients with that in his career. I've listened to lipid PhDs lecture and they talk about it being rare but present.
We cannot change the genetic case. But everyone else can be affected.
I was talking with someone recently who changed her diet. In a matter of weeks her LDL cholesterol dropped 50 points.
Can you provide any basic literature on how large of an effect can be achieved through lifestyle alone? It sounds like my vaguely recalled ~15% is way, way off.
(I do wonder how statins are so easily justified if lifestyle is so effective, but pharma profits/lobbying may explain that.)