Therein lies the rub... our own bodies create Cholesterol and everyone has a different reaction to ingesting cholesterol. My fathers numbers where always low, (around 80) yet he died of a heart attack, my mothers was always in the 300's and had no circulatory problems. That said, some are prone to building up the levels of the bad stuff via red meats, eggs and so on.
My daughter went on an almost no carb diet and I begged her to monitor her levels. To my knowledge she has never done that even though she eats so much red meat that if she walks past a pasture the cows run to the other end. My concern is mostly that civilization survived on carbs since the beginning of time. It's required for muscle growth and energy. My daughter may appear very healthy on the outside, but, she is always tired, always has headaches and has a cold about every other week. How much that has to do with lack of carbs I don't really know, but, I am suspicious.