Most Americans in general are D3 deficient.

Your body creates its own cholesterol. Outside foods have little influence on your body's cholesterol levels. If you eat too much cholesterol, you poop out the excess. High/low cholesterol numbers are a symptom indicating something is wrong within your body. Sadly, most doctors will give people with high cholesterol a statin to artificially lower numbers, and thus mask the underlying problem. This allows the underlying problem to worsen and it usually doesn't get caught until it is so bad that you need expensive medical care. Had the doctor figured out the underlying issue in the first place, it could have probably been fixed with supplements.