LDL particles carry cholesterol through your blood. When there are too many, they get trapped in artery walls and build up as plaque. Your LDL number measures the cholesterol cargo inside these particles, not the particle count itself.
Your LDL target
The 2026 ACC/AHA guidelines set LDL targets based on your calcium score, because calcium is a direct measure of how much plaque you already have:
| Calcium score | LDL target |
|---|---|
| 0 | Standard prevention |
| 1–99 | < 100 mg/dL |
| 100–299 | < 70 mg/dL |
| 300+ | < 55 mg/dL |
If you have existing heart disease, diabetes, or high Lp(a), target < 55 mg/dL regardless of calcium score.
Why LDL alone can miss the picture
Two people with the same LDL can have very different risk. LDL measures cargo, not the number of particles. Someone with many small particles has more risk than someone with fewer large particles, even at the same LDL.
ApoB counts the particles directly. When ApoB and LDL disagree, ApoB is the better predictor. This happens often with insulin resistance, prediabetes, obesity, or high triglycerides.
How to lower LDL
Diet changes with the strongest evidence:
- Cut saturated fat (butter, red meat, full-fat dairy, tropical oils).
- Add soluble fiber (oats, beans, apples, psyllium).
- Replace saturated fat with unsaturated fat (olive oil, nuts, fatty fish).
- Eliminate trans fats completely.
Exercise has a modest direct effect on LDL. Its real gains are on triglycerides, HDL, blood pressure, and insulin sensitivity.
If lifestyle isn't enough, statins lower LDL by 30–55%. If statins aren't enough or you can't tolerate them, ezetimibe, bempedoic acid, and PCSK9 inhibitors are options.
When to test
Every 4–6 years starting at age 20. Every 1–2 years if you have family history of early heart disease, diabetes, high blood pressure, high Lp(a), or you smoke. Fasting is usually not required.
The bottom line
Know your LDL. Know your target based on your risk profile, not just the population average. Plaque buildup is cumulative. The earlier you lower LDL, the more years of protection you buy.
Confidence in your heart health
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