The normal level of LDL cholesterol is below 3.4 mmol/L (130 mg/dl) and the ideal level is below 2.6 mmol/L (100 mg/dl). High LDL refers to higher than normal LDL on laboratory tests. Factors that may lead to elevated LDL include: 1. Diet: A diet rich in saturated fat and cholesterol may increase blood cholesterol levels. 2, weight: being overweight can increase LDL levels in the body. 3, physical activity: lack of physical activity may lead to weight gain, which may lead to increased LDL levels. 4, Smoking: Smoking may reduce HDL levels, and since HDL has the effect of removing LDL from the blood vessel wall, a decrease in HDL may lead to an increase in LDL. 5, Genes: Genotype may partially determine the body’s own cholesterol synthesis, so high cholesterol levels have a tendency to run in families, for example, familial hypercholesterolemia is a family-heritable hyperlipidemia. 6.Other drugs: Some specific drugs, such as glucocorticoids, certain antihypertensive drugs, and AIDS drugs, can cause elevated LDL levels. 7, other diseases: including chronic kidney disease, diabetes, AIDS, etc. have increased LDL risk.