ALthough @zand, as some have found, large volumes of butter and cream can push up those pesky levels that you don't want, so pushing them for everyone may not be the most effective route!
I thought that by eating a much lower level of carb in my diet would also result in lower cholesterol levels, but unfortunately not. Through eating more nuts, cream cheese, butter, full fat yogurt, whole milk, my bad LDL increase to equal my good HDL and also an increase in my trigs as well and this was with eating about 60g carb per day. Bg levels were fairly good though so that made the low carb route a good way to go even though my bodyweight increased because of the level of fat consumed.
Ive now cut out eating so much butter, cut back the nuts, the cream cheese and the whole milk and still low carb but without the fat. As a result my bodyweight is about 49kg whereas it was about 56kg.