For Grandmama, excellent comment. Some folk just produce too much dodgy cholesterol, and though diet can help, Statins will do the job quicker.
My cholesterol score was incredibly high, and I had a heart scare over 20 years ago. Like a big chunk of the population (at least those of a certain age), I'm now on a Statin (the variety has been changed 3 times), a mini-aspirin, and one of the several acid-reflux meds.
My cholesterol rating quickly dropped thx to Statins, yes I have some oat-based products to help, (quite famous for its properties), but they can only do so much. I've known a couple of stick-thin people, healthy diet, and exercise freaks, who were astounded when a blood test revealed an exceptionally high score for cholesterol. It's just the way some folk are -- and, oddly, I'm sure there are some chubbies, on burger and chips most nights of the week, fry-up breakfast and the occasional greasy kebab, whose cholesterol is well undr the danger level.
So if you're not on an annual check-up, best get yourself tested, to be sure.