Your body makes around 80 - 85% of your cholesterol. Every cell needs them, pregnancy for example is impossible without good levels, as is the vital functioning of the brain which has loads. As
@bulkbiker said, a CAC examination sees the disease that you may be worried about whereas numbers are super confused and persons who have even had LDL numbers of 9, have had perfect non-clogged arteries - Framingham scores if provided have also turned out to be close to useless.
We do not in the UK get an NMR test which can tell more about the quality of the LDL particles that may be a concern, so we are worried without all of the facts. If weight is being lost, cholesterol numbers will naturally go up as they as the cholesterol is decanted into the blood stream. Triglyceride to HDL ratio is regarded as a key metric. HiiT and walking can reduce numbers. Statins apparently work for circa 1 in 100 if a heart attack has already happened (an aspirin circa 1 in 83 (with no side affects) Dr Aseem Malhotra). For me what it comes down to is which science do you believe, the science that says carbs and sugar create the Triglycerides which create the plaque within your arteries or that dietary FAT is the cause; if it is the former you believe then LCHF should be protective. It is is ok to be confused, but I have read and listed to so much information, personally I am satisfied that carbs and sugar are not artery friendly.
If you are interested in a CAC here's a place for £300.00 which will do the test
https://www.pallmallmedical.co.uk/tests-scans-and-diagnostics/ct-calcium-score, an alternative reputable company in other medical areas (my wife works with them)
https://www.nuffieldhealth.com/tests-scans/ct-calcium-scoring-or-cardiac-calcium-scoring.