How to Lower Your ApoB: A Step-by-Step Protocol
How to Lower Your ApoB: A Step-by-Step Protocol
You know your ApoB number. Maybe it came from Function Health, a direct-to-consumer lab, or a forward-thinking doctor. Maybe you read our explainer on what ApoB is and went and got tested.
Now you want to know how to lower it.
The short answer: it depends on how far you are from your target, your ApoE genotype, and whether lifestyle changes alone can close the gap. This post walks through the full protocol, step by step.
Step 1: Know your target (it’s not one number)
ApoB targets vary by risk tier. “Below 100” is a starting point, not a universal goal.
| Risk tier | ApoB target | Who’s in this tier |
|---|---|---|
| Tier D (lower risk) | Below 100 mg/dL | No established disease, no elevated Lp(a), no major risk factors |
| Tier C (moderate) | Below 80 mg/dL | Multiple risk factors, elevated Lp(a), or strong family history |
| Tier B (high) | Below 65 mg/dL | Established cardiovascular disease or equivalent risk |
| Tier A (very high) | Below 55 mg/dL | Severe or progressive disease, multiple compounding factors |
Your tier depends on your full risk picture: Lp(a) level, family history, coronary artery calcium score, inflammatory markers (hsCRP), and the AHA PREVENT risk equations (2023). A single ApoB number without risk stratification tells you almost nothing about where your target should be.
Protocol’s Cardiovascular Risk protocol assigns your tier using all of these inputs. If you’re doing this on your own, find a physician who understands ApoB-based risk stratification.
Step 2: Calculate your gap
Subtract your target from your current ApoB. This number determines your strategy.
Gap under 20 mg/dL. Lifestyle intervention has a realistic chance of closing this. Diet changes, exercise, and weight management can reduce ApoB by 10-25% in some people, though the response varies widely.
Gap of 20-40 mg/dL. Lifestyle will probably get you part of the way there. Start those changes immediately, but plan for medication if the 12-week recheck shows insufficient progress.
Gap over 40 mg/dL. Lifestyle alone almost never closes this gap. Start pharmacotherapy alongside lifestyle changes. Don’t wait for lifestyle to fail first. Every month with elevated ApoB adds cumulative risk.
Step 3: Diet — matched to your ApoE genotype
Most generic advice falls short here. The dietary strategy that lowers ApoB most effectively depends on your ApoE genotype, which governs how your body processes dietary fat.
ApoE 3/3 (most common, ~60% of population)
The standard approach works here. Reduce saturated fat to below 7% of calories, replacing it with monounsaturated and polyunsaturated fats (olive oil, avocado, nuts, fatty fish). Then increase soluble fiber (oats, beans, psyllium) to 10-25g/day. Fiber binds bile acids, which forces your liver to pull LDL particles from circulation to synthesize more.
ApoE 4 carriers (~25% of population)
These are hyper-responders to dietary fat. Saturated fat restriction matters more for ApoE4 carriers than for any other genotype. The upside: they often see the largest ApoB reductions from dietary changes. The downside: they also see the largest increases from high-fat diets. If you’re ApoE4 and eating a high-fat “keto” diet, that diet may be directly responsible for an elevated ApoB.
ApoE 2 carriers (~10% of population)
Typically have naturally lower ApoB, though triglycerides can run high. The dietary focus shifts toward triglyceride management: fewer refined carbohydrates, limited alcohol, adequate omega-3 intake.
If you don’t know your ApoE genotype, it’s a one-time test. It doesn’t change. And it meaningfully affects which dietary changes will work best for you.
Step 4: Exercise
Regular aerobic exercise reduces ApoB modestly (5-10%) independent of weight loss. The mechanism: exercise increases LDL receptor activity, which clears particles from circulation faster.
Consistency matters more than the type. Zone 2 cardio (conversational pace, sustained 30-45 minutes) 3-4 times per week is the baseline recommendation. Adding high-intensity intervals on top of that improves cardiovascular fitness but doesn’t do much extra for ApoB specifically.
Resistance training won’t directly lower ApoB. What it does is support body composition changes, particularly reducing visceral fat, that improve the broader metabolic picture. Insulin resistance worsens ApoB, so metabolic health and cardiovascular health are more connected than most people realize.
Step 5: Targeted supplementation (limited evidence)
Two supplements have reasonable evidence for ApoB reduction. Neither one replaces medication when the gap is large.
Omega-3 fatty acids (EPA/DHA). At 2-4g/day, omega-3s can reduce triglycerides by 20-30% and may modestly reduce ApoB. The REDUCE-IT trial showed cardiovascular event reduction with 4g/day of icosapent ethyl (EPA only) in statin-treated patients with elevated triglycerides. Worth noting: standard fish oil is not the same product and has weaker evidence.
Soluble fiber / psyllium. 10-15g/day of psyllium husk reduces LDL-C by roughly 5-10% through bile acid binding. Cheap, safe, and additive to dietary changes. The effect isn’t dramatic, but for a small gap it can matter.
What doesn’t have strong evidence for ApoB reduction: red yeast rice (inconsistent quality; it’s basically an unregulated statin), bergamot, berberine (modest effects in small trials, insufficient data on cardiovascular outcomes), and niacin (the AIM-HIGH and HPS2-THRIVE trials showed no cardiovascular event reduction despite HDL improvement).
Step 6: Pharmacotherapy — when the gap demands it
If lifestyle changes and supplements can’t close the gap to your target, medication is the evidence-based next step. Some people hear “statin” and feel like they’ve failed. They haven’t. For many genotypes and risk profiles, the math simply doesn’t work without pharmacotherapy.
Statins
The first-line treatment. Statins reduce ApoB by 30-50% depending on the drug and dose. The CTT (Cholesterol Treatment Trialists’) meta-analysis covered over 170,000 participants across 26 randomized trials and found consistent cardiovascular event reduction with statin therapy, with equal efficacy in men and women.
The two most common options are rosuvastatin (strongest LDL/ApoB reduction per milligram) and atorvastatin (widely used, flexible dosing). Your physician matches the potency to your gap.
Ezetimibe
This blocks cholesterol absorption in the gut and adds 15-25% additional ApoB reduction on top of a statin. Physicians often add ezetimibe when a statin alone doesn’t reach target, because escalating to higher statin doses hits diminishing returns fairly quickly.
PCSK9 inhibitors
Reserved for members who can’t tolerate statins or whose ApoB stays above target on maximum tolerated therapy. These injectable medications (evolocumab, alirocumab) reduce ApoB by an additional 50-60%. They’re highly effective but expensive, so they’re typically used for the highest-risk patients.
The decision tree
Protocol’s approach: when the gap exceeds 40 mg/dL, start lifestyle changes and pharmacotherapy at the same time. Recheck ApoB at 12 weeks. If you’re at target, maintain. If not, escalate. That might mean increasing the statin dose, adding ezetimibe, or referring to a lipidologist for complex cases. We don’t stop until the member reaches target or we’ve exhausted every evidence-based option.
Step 7: Recheck and verify
Most people skip this step. It’s the one that matters most.
You start a statin. Change your diet. Add psyllium. Three months go by. Does anyone recheck your ApoB? In standard care, usually not. You get a lipid panel at your next annual physical, LDL-C is lower, and your doctor says “the statin is working.” But LDL-C and ApoB are different measurements. LDL-C can improve while ApoB stays above target.
Recheck ApoB specifically at 12 weeks after any intervention. At target? Good. Recheck annually. Not at target? Adjust. Don’t assume the intervention worked.
Protocol rechecks every member. Our data shows that this pipeline moved ApoB optimal attainment from 27% at intake to 69% during membership across our membership. That improvement happened largely because we actually verify.
Why this is hard to do alone
Every step in this protocol is straightforward in isolation. The testing, the dietary changes, the exercise, the medication decisions, the rechecks. None of it is mysterious.
The reason people fail at lowering ApoB isn’t that the science is unclear. It’s that nobody builds them a plan and then checks whether the plan worked. Your PCP has 15 minutes per visit. Function Health gives you a dashboard, not a prescription. Your trainer doesn’t know your ApoE genotype and couldn’t order a statin if they did.
Protocol’s Cardiovascular Risk protocol packages all of this into a structured 6-week protocol with 3 sessions, risk-tier-specific targets, and a recheck built in. It starts with a Foundation Assessment to establish your full baseline.