There are two type of cholesterols -- high-density lipoprotein or HDL which is a good cholesterol, and the low-density lipoprotein or LDL, which is considered a bad cholesterol. Most of human body is made up of the LDL. The risk of heart attack is heightened with the LDL. The HDL, on the other hand, can lower the risk for heart attack.
It does, when inherited from parent. Cholesterol levels in an individual is been associated to three risk factors namely; hereditary, diet and obesity. Early stage accumulation of cholesterol may be linked with parent having elevated cholesterol.
Cholesterol could be good if it is the HDL- High density lipoprotein type and it could be bad, if it is the LDL- Low density lipoprotein type.
Definetly yes, for instance, a rich diet in fats from an early age can lead to the development of atherosclerosis in your middle age. The mainly responsible for the development of CVD is LDL cholesterol, oxidized LDL cholesterol tend to be internalized in the intima of blood vessels, causing a dysfunctional endothelium triggering different inflammatory reactions, for example, recruiting macrophages which will also contribute to the formation of a cholesterol plaque. Otherwise, HDL lipoproteins can accept that cholesterol from the vessels and take them to the liver, where will be catabolized. So, overall, low quantites (between the normal range) of LDL and high of HDL lipoproteins is the optimal. However, several studies are pointing out that, is not only about the quantity of the lipoproteins what can lead to a CVD but also the quality. In our laboratory for instance, we can see volunteers with a great quantity of HDL lipoproteins but with a low function in preventing LDL from oxidation.