Cholesterol is a waxy substance produced by the liver and obtained through diet, essential for building cell membranes, synthesising steroid hormones, and producing bile acids. The problem arises when specific cholesterol-carrying particles — particularly low-density lipoprotein (LDL) — become elevated and begin depositing in arterial walls, driving the atherosclerotic process that causes heart attacks and strokes. Understanding what the numbers mean and how to optimise them is one of the highest-value steps in cardiovascular risk management.
Understanding Your Lipid Panel
A standard fasting lipid panel measures four components. Total cholesterol: desirable below 200 mg/dL. LDL cholesterol (the primary atherogenic particle): optimal below 100 mg/dL for most adults; below 70 mg/dL for those with established CVD or very high 10-year risk. HDL cholesterol (the "protective" lipoprotein): desirable above 60 mg/dL; low HDL (below 40 mg/dL in men, below 50 mg/dL in women) independently raises risk. Triglycerides: optimal below 150 mg/dL; elevated levels (above 200 mg/dL) are associated with insulin resistance, pancreatitis risk, and residual cardiovascular risk. Advanced testing may include Lp(a) — a genetically determined independent risk factor for premature CVD present in about 20% of the population.
Dietary and Lifestyle Management
Replacing saturated fats (red meat, full-fat dairy, coconut oil) with unsaturated fats (olive oil, avocados, nuts, fatty fish) produces meaningful LDL reductions of 10–20%. Adding soluble fibre (oats, psyllium, lentils, apples) — which binds bile acids in the gut and forces the liver to draw more LDL from circulation — provides an additional 5–10% reduction. Plant sterols/stanols (2 g/day through fortified foods or supplements) reduce LDL by 8–10% independently. Aerobic exercise primarily raises HDL (by 3–6%) and lowers triglycerides; resistance training modestly reduces LDL. Quitting smoking raises HDL substantially within weeks.
Pharmacotherapy
When lifestyle optimisation is insufficient — or when baseline risk is high enough to warrant immediate pharmacological intervention — statins are the cornerstone of LDL reduction. High-intensity statins (atorvastatin 40–80 mg, rosuvastatin 20–40 mg) reduce LDL by approximately 50%; moderate-intensity statins (simvastatin 20–40 mg, pravastatin 40 mg) produce 30–50% reductions. For patients requiring additional reduction, ezetimibe (reduces intestinal cholesterol absorption; 10–20% additional LDL reduction) and PCSK9 inhibitors (evolocumab, alirocumab — injectable monthly; 50–60% further LDL reduction on top of statin) are available. The recently approved inclisiran — a small interfering RNA administered twice yearly — offers a convenient alternative for long-term management.
Frequently Asked Questions
Are statins safe for long-term use?
Decades of evidence from large trials support statins' safety and cardiovascular benefit. Myalgia (muscle aching) affects 5–10% of users; true myopathy is rare. A modest increase in type 2 diabetes risk exists but is outweighed by cardiovascular benefit in appropriate patients. The recommendation for statin therapy should be based on overall cardiovascular risk, not cholesterol numbers alone.
Does dietary cholesterol raise blood cholesterol?
For most people, dietary cholesterol (from eggs, shellfish) has a modest effect on blood cholesterol — far less than saturated and trans fat intake. Current guidelines no longer impose a specific daily cholesterol limit for most individuals, though those with familial hypercholesterolaemia or diabetes should discuss individual dietary targets with their provider.
Sources
- Grundy SM, et al. 2018 AHA/ACC Cholesterol Guidelines. JACC. 2019.
- American Heart Association. Cholesterol Management. 2023.
- Mayo Clinic. High cholesterol. 2023.