Nearly 94 million American adults have total cholesterol levels above 200 mg/dL, and about 28 million have levels above 240 mg/dL — yet high cholesterol produces no symptoms whatsoever until it causes a heart attack or stroke. According to the CDC, high cholesterol is one of the most significant — and most treatable — risk factors for cardiovascular disease, which kills more Americans than any other cause. Understanding your cholesterol numbers and knowing what to do about them could add years to your life. For a broader view of common health conditions, see our medical conditions guide.
What Is Cholesterol?
Cholesterol is a waxy, fat-like substance found in every cell of your body. Despite its bad reputation, cholesterol is essential for life — your body needs it to build cell membranes, produce hormones (including estrogen, testosterone, and cortisol), make vitamin D, and create bile acids that help digest fat. Your liver produces all the cholesterol your body needs. The problem arises when excess cholesterol — primarily from dietary factors and genetic influences — accumulates in your bloodstream.
Cholesterol travels through your blood in particles called lipoproteins. The two most important types are low-density lipoprotein (LDL) and high-density lipoprotein (HDL). LDL carries cholesterol from the liver to cells throughout the body. When there’s too much LDL, the excess deposits in artery walls, forming plaque — the basis of atherosclerosis. HDL does the opposite: it collects cholesterol from artery walls and carries it back to the liver for disposal.
Triglycerides, another type of blood fat, are also measured as part of a standard lipid panel. High triglycerides — often driven by excess sugar, refined carbohydrates, and alcohol — independently contribute to cardiovascular risk. The NHLBI emphasizes that understanding all components of your lipid panel, not just total cholesterol, is important for assessing your cardiovascular risk.
Understanding Your Numbers
A standard lipid panel reports four key values. Here are the general targets for adults, though your doctor may set different goals based on your individual risk profile:
- Total cholesterol: Desirable is below 200 mg/dL. Borderline high is 200-239. High is 240 and above.
- LDL cholesterol (“bad cholesterol”): Optimal is below 100 mg/dL. Near optimal is 100-129. Borderline high is 130-159. High is 160-189. Very high is 190 and above.
- HDL cholesterol (“good cholesterol”): Higher is better. Below 40 mg/dL for men and below 50 for women is considered a risk factor. 60 and above is protective.
- Triglycerides: Normal is below 150 mg/dL. Borderline high is 150-199. High is 200-499. Very high is 500 and above.
For people with established cardiovascular disease or diabetes, doctors often target LDL below 70 mg/dL — or even below 55 mg/dL in very high-risk patients. The Mayo Clinic recommends that adults begin cholesterol screening at age 20, with repeat testing every four to six years for low-risk individuals and more frequently for those with risk factors.
Causes of High Cholesterol
High cholesterol results from an interplay of diet, lifestyle, genetics, and other health conditions. Diets high in saturated fat (found in red meat, full-fat dairy, and tropical oils) and trans fats (found in some processed foods) directly raise LDL cholesterol. Excess body weight, particularly abdominal fat, tends to raise LDL and triglycerides while lowering HDL. Physical inactivity has a similar effect.
Genetics play a substantial role. Familial hypercholesterolemia (FH) is a genetic condition affecting about 1 in 250 people that causes very high LDL levels from birth. People with FH can have LDL levels of 190 mg/dL or higher and are at dramatically elevated risk for premature heart disease. The CDC estimates that fewer than 10% of people with FH have been diagnosed, meaning most are untreated.
Several medical conditions contribute to high cholesterol, including hypothyroidism, chronic kidney disease, diabetes, and liver disease. Certain medications — including some diuretics, beta-blockers, corticosteroids, and immunosuppressants — can also raise cholesterol levels. Age and sex matter: cholesterol levels tend to rise with age, and women’s LDL often increases after menopause.
Health Risks of High Cholesterol
The primary danger of high cholesterol is atherosclerosis — the buildup of plaque in artery walls throughout the body. In the coronary arteries, this leads to coronary artery disease, angina, and heart attacks. In the carotid arteries (supplying the brain), it increases the risk of stroke. In the peripheral arteries (supplying the legs and arms), it causes peripheral artery disease.
Atherosclerosis is a slow, progressive process that begins in adolescence and develops over decades. For much of this time, there are no symptoms — the first sign may be a heart attack or stroke. This is why high cholesterol is sometimes called a “silent killer.” According to the American Heart Association, high cholesterol roughly doubles your risk of heart disease.
Very high triglycerides (above 500 mg/dL) carry an additional risk: acute pancreatitis, a painful and potentially dangerous inflammation of the pancreas. This is a separate concern from atherosclerosis and requires specific treatment to bring triglyceride levels down rapidly.
Lowering Cholesterol Through Diet
Dietary changes can lower LDL cholesterol by 10-30% depending on the degree of change and your starting point. The most impactful dietary modifications include reducing saturated fat to less than 7% of daily calories, eliminating trans fats entirely, increasing soluble fiber intake (found in oats, beans, lentils, apples, and citrus fruits), and adding plant sterols and stanols (found in fortified foods).
The Mediterranean diet — rich in olive oil, fish, nuts, whole grains, fruits, and vegetables — has particularly strong evidence for improving lipid profiles and reducing cardiovascular events. Research published in the New England Journal of Medicine demonstrated that a Mediterranean diet supplemented with extra-virgin olive oil or nuts reduced major cardiovascular events by about 30% compared to a reduced-fat diet.
Omega-3 fatty acids from fatty fish (salmon, mackerel, sardines) or supplements can lower triglycerides by 15-30%. Nuts (particularly almonds and walnuts) have been shown to lower LDL cholesterol. Soy protein may modestly reduce LDL. The NHLBI recommends the DASH or TLC (Therapeutic Lifestyle Changes) eating plans as structured approaches to cholesterol-lowering nutrition.
Exercise and Weight Management
Regular physical activity improves your cholesterol profile in several ways. It raises HDL cholesterol — one of the few interventions that reliably does so. Exercise also lowers triglycerides, may modestly reduce LDL, and shifts LDL particles from the small, dense type (more dangerous) to the large, buoyant type (less dangerous). The benefit comes from consistency rather than intensity: brisk walking for 30 minutes five days a week produces meaningful improvements.
Weight loss amplifies these benefits. Losing just 5-10% of your body weight can lower LDL by 5-8%, raise HDL, and significantly reduce triglycerides. For someone weighing 200 pounds, that’s a loss of 10-20 pounds. According to the American Heart Association, maintaining a healthy weight is one of the most effective strategies for long-term cholesterol management.
Quitting smoking also impacts your lipid profile. Smokers tend to have lower HDL levels, and HDL typically increases within weeks to months of quitting. Alcohol has a complex relationship with cholesterol: moderate consumption can raise HDL, but excessive drinking raises triglycerides and carries other health risks that outweigh any potential benefit.
Cholesterol-Lowering Medications
Statins
Statins are the first-line medication for high cholesterol and have the strongest evidence base of any cholesterol drug. They work by blocking an enzyme in the liver that produces cholesterol, reducing LDL by 30-50% or more depending on the dose and specific statin. Commonly prescribed statins include atorvastatin (Lipitor), rosuvastatin (Crestor), and simvastatin (Zocor).
Beyond lowering LDL, statins stabilize arterial plaques, reduce inflammation, and have been shown in numerous large clinical trials to reduce heart attacks, strokes, and cardiovascular death. The Mayo Clinic notes that the most common side effect is muscle pain, which occurs in about 5-10% of patients. Most people tolerate statins well, and the cardiovascular benefits far outweigh the risks for those who need them.
Other Medications
When statins aren’t enough or can’t be tolerated, several other options exist. Ezetimibe (Zetia) blocks cholesterol absorption in the intestine and can lower LDL by an additional 15-20% when added to a statin. PCSK9 inhibitors (evolocumab and alirocumab) are injectable medications that can dramatically lower LDL by 50-60%, even on top of statin therapy — particularly useful for people with familial hypercholesterolemia or very high cardiovascular risk.
Bempedoic acid (Nexletol) is a newer oral medication that works through a similar pathway as statins but may cause fewer muscle-related side effects. Fibrates primarily lower triglycerides and modestly raise HDL. Niacin (vitamin B3) can improve all aspects of the lipid panel but has side effects that limit its use. Bile acid sequestrants lower LDL by preventing bile acid reabsorption but can raise triglycerides and cause gastrointestinal side effects.
For very high triglycerides, prescription omega-3 fatty acid preparations (icosapent ethyl/Vascepa) have shown cardiovascular benefit in people already on statins. Understanding healthcare costs is relevant here, as newer medications like PCSK9 inhibitors carry significantly higher price tags than generic statins.
Special Populations
Children with familial hypercholesterolemia may need cholesterol-lowering treatment starting in childhood. The American Academy of Pediatrics recommends universal lipid screening for children between ages 9-11 and again at 17-21. Statins are approved for use in children as young as 8-10 years old with FH.
Older adults require individualized consideration. The benefits of statins in people over 75 without established cardiovascular disease are less clear, and decisions should weigh potential benefits against the burden of additional medication. For older adults with known cardiovascular disease, statin therapy remains beneficial regardless of age.
Women have historically been underrepresented in cholesterol research, but current guidelines apply the same LDL targets and treatment thresholds to both sexes. Pregnancy requires special consideration — statins and most lipid-lowering drugs are contraindicated during pregnancy and breastfeeding.
Frequently Asked Questions
How often should I get my cholesterol checked?
Adults aged 20 and older should have a lipid panel every four to six years if they are at low cardiovascular risk. If you have risk factors — high blood pressure, diabetes, smoking, family history of early heart disease, or obesity — more frequent testing (every one to two years) is appropriate. People on cholesterol-lowering medications typically get checked every three to twelve months to monitor response to treatment.
Can high cholesterol be reversed?
High cholesterol levels can absolutely be reduced through diet, exercise, weight loss, and medications. The question of whether arterial plaque can be reversed is more nuanced — statins and aggressive LDL lowering have been shown to modestly reduce plaque volume in imaging studies, and more importantly, they stabilize plaques so they are less likely to rupture and cause a heart attack.
Are eggs bad for cholesterol?
The relationship between dietary cholesterol and blood cholesterol is more complex than once believed. For most people, moderate egg consumption (up to one egg per day) does not significantly raise LDL or increase cardiovascular risk. The American Heart Association’s current position is that eggs can be part of a heart-healthy diet when consumed in moderation. Saturated and trans fats in your overall diet have a much larger impact on blood cholesterol than dietary cholesterol itself.
Do I need to fast before a cholesterol test?
Traditional guidelines recommended a 9-12 hour fast before a lipid panel, primarily for accurate triglyceride measurement. Recent evidence and updated guidelines suggest that non-fasting lipid panels are acceptable for most screening purposes. However, your doctor may still request a fasting test if your non-fasting triglycerides are elevated (above 400 mg/dL) or for follow-up monitoring on treatment.
What are the side effects of statins?
The most commonly reported side effect is muscle pain or weakness (myalgia), occurring in about 5-10% of users. Serious muscle damage (rhabdomyolysis) is extremely rare — about 1 in 10,000 patients per year. Other potential side effects include liver enzyme elevation (typically minor and reversible) and a slightly increased risk of type 2 diabetes in people already predisposed. Most people tolerate statins well, and the cardiovascular benefits generally far outweigh the risks.
Taking Action on Your Cholesterol
High cholesterol is a problem you can do something about. Start by knowing your numbers — if you haven’t had a lipid panel in the last few years, schedule one. If your numbers are elevated, work with your doctor to determine whether lifestyle changes alone are sufficient or whether medication is warranted. Don’t dismiss high cholesterol because you feel fine — the absence of symptoms is precisely what makes this condition so dangerous.
Make dietary changes you can sustain: swap saturated fats for healthy fats, eat more fiber, add fatty fish to your weekly meals, and watch your portion sizes. Move your body regularly. If your doctor prescribes a statin, take it — the evidence supporting their use in people who need them is among the strongest in all of medicine. Small, consistent actions today prevent catastrophic events tomorrow.