A good LDL cholesterol level for most adults is below 100 mg/dL. That’s the target for people at low to moderate risk of heart disease, and it’s the number most doctors use as a baseline when reviewing your lipid panel. But “good” isn’t one-size-fits-all. If you already have heart disease, diabetes, or significant risk factors, your target drops to 70 mg/dL or even 55 mg/dL.
LDL Targets Based on Your Risk
The most recent guidelines from the American College of Cardiology and American Heart Association, published in 2026, set specific LDL goals based on how likely you are to have a heart attack or stroke in the next ten years. For adults at borderline or intermediate risk (roughly 3% to 10% ten-year risk), the goal is LDL below 100 mg/dL. For those at high risk (10% or greater), the goal drops to below 70 mg/dL.
People who already have established heart disease face the tightest targets. If you’ve had a heart attack, stroke, or have significant plaque buildup in your arteries, the recommended LDL is below 55 mg/dL. The same 55 mg/dL target applies to people with severe inherited high cholesterol (LDL at or above 190 mg/dL) alongside existing heart disease.
Diabetes adds its own layer. If you have diabetes but no heart disease, the goal is below 100 mg/dL. If you have diabetes plus multiple risk factors like high blood pressure, smoking, or a family history of early heart disease, your target tightens to below 70 mg/dL.
For children and teens age 19 or younger, a healthy LDL is below 110 mg/dL.
Why LDL Matters for Your Arteries
LDL particles carry about 67% of the cholesterol in your blood, delivering it to tissues that need it, including your adrenal glands, reproductive organs, and muscles. Cells use this cholesterol to build and maintain their outer membranes and to produce hormones. LDL isn’t inherently harmful. It’s performing a necessary job.
The trouble starts when there’s too much of it. LDL particles can slip through the inner lining of your arteries, especially in areas where blood flow is turbulent, like bends and branch points. Once trapped inside the artery wall, LDL particles lose the protection of antioxidants that normally circulate in your blood. They become oxidized, and that oxidized LDL triggers a strong inflammatory response. Your immune system sends white blood cells to clean up the damage, but those cells can become engorged with cholesterol and form the fatty streaks that eventually grow into plaques. Over years, this process narrows arteries and can lead to heart attacks or strokes.
Can LDL Be Too Low?
LDL below 40 mg/dL is considered very low. One long-term study found a link between very low LDL and a higher risk of hemorrhagic stroke, the type caused by bleeding in the brain rather than a blockage. There’s also a possible connection to diabetes risk. That said, the data on harms from very low LDL is limited, and for people on cholesterol-lowering medications who achieve levels in the 30s or 40s, the cardiovascular benefits have generally outweighed any observed risks in clinical trials. This is still an area where long-term safety data is incomplete.
LDL-C vs. ApoB: A Better Measure?
The number on your standard blood test is LDL-C, which measures the total amount of cholesterol carried inside LDL particles. But what actually drives plaque formation is the number of cholesterol-carrying particles entering your artery walls, not just how much cholesterol each one holds. Two people can have the same LDL-C reading while carrying very different numbers of particles.
This is where apolipoprotein B (apoB) testing comes in. Every LDL particle contains exactly one apoB molecule, so measuring apoB gives you a direct count of all the particles capable of building plaque. The European Society of Cardiology concluded in 2019 that apoB is a more accurate marker of cardiovascular risk than LDL-C. This distinction matters most in people with diabetes, metabolic syndrome, or high triglycerides, where LDL-C can look reassuringly normal while particle counts are actually elevated.
ApoB testing is inexpensive and widely available, but it’s still not part of a standard lipid panel in most settings. The practical takeaway: if your triglycerides are high or you have metabolic risk factors and your LDL-C looks fine, asking about an apoB test can give you a more complete picture.
How to Lower Your LDL
Diet changes can meaningfully move your LDL number, though the effect varies by person. Plant sterols and stanols, found naturally in small amounts in grains, nuts, and vegetables (and added to some fortified foods like margarine and orange juice), lower LDL by about 10% at a dose of 2 grams per day. Soluble fiber, the kind found in oats, beans, lentils, and psyllium, can lower LDL by roughly 5 to 15 mg/dL when you eat 3.5 to 7 grams daily. Konjac glucomannan, a fiber supplement derived from a root vegetable, appears to be the most effective fiber per gram.
Exercise and weight loss have their biggest impact on triglycerides rather than LDL directly. That doesn’t mean they’re unimportant. Losing excess weight improves your overall lipid profile, reduces inflammation, and lowers blood pressure, all of which reduce cardiovascular risk even if your LDL number doesn’t drop dramatically. Reducing saturated fat intake, primarily from red meat, full-fat dairy, and processed foods, remains one of the most reliable dietary strategies for bringing LDL down.
When lifestyle changes aren’t enough to reach your target, medications are effective. For many people, the combination of dietary changes and medication is what ultimately gets LDL to goal, particularly if you’re aiming for the stricter targets of 70 or 55 mg/dL.
Do You Need to Fast Before Testing?
Probably not. Evidence from more than 300,000 people shows that non-fasting lipid panels predict future cardiovascular events as well as, or better than, fasting ones. Multiple guidelines in the U.S., Europe, Canada, and elsewhere now endorse non-fasting testing for most people. Eating before the test may lower your LDL reading by up to 8 mg/dL compared to fasting, a small difference that rarely changes clinical decisions. Your doctor may still request a fasting test if your triglycerides are very high, since eating has a bigger effect on that number (up to 26 mg/dL higher when non-fasting).