I am not a physican, but the mom of a type 1
diabetic and the daughter of a type
2. I have a cholesterol problem. I can tell you that my daughter doctor does check her constantly for high cholesterol, one when I questioned him about it he told me that food is only a factor 50% of the time. High cholesterol can be hereditary.
When was told I had high cholesterol, my doctor wanted to but me on pills, i was not good at talking them, so I tried the type of diets you suggest.