How to improve your cholesterol and reduce your cardiac risk

Saturated fat suppresses LDL receptor expression on liver cells, slowing the clearance of LDL particles from circulation. Reducing intake can restore receptor activity and lower circulating LDL and ApoB. The effect, however, varies considerably by person — and depends critically on what replaces it. Swapping saturated fat for unsaturated fat (olive oil, nuts, avocado) tends to be beneficial. Swapping it for refined carbohydrates can be counterproductive, particularly for people with elevated triglycerides.

In controlled studies, the same dietary intervention has produced outcomes ranging from meaningful LDL reduction to a modest increase in some individuals. This likely reflects differences in LDL particle subtype — a dimension most standard lipid panels don't capture. If you reduce saturated fat and retest, pay attention to your actual response.

Soluble fiber forms a gel in the digestive tract that binds bile acids — which the body synthesizes from cholesterol — and carries them out in stool. To replenish them, the liver upregulates LDL receptors and draws cholesterol-carrying particles from the blood. This mechanism is well-established. The magnitude of effect varies by individual and by the type and consistency of fiber intake.

Refined carbohydrates cause rapid blood sugar elevation, which prompts the liver to increase triglyceride production. These triglycerides get packaged into VLDL particles — each carrying one ApoB protein — before entering the bloodstream. In people with elevated triglycerides, VLDL can represent a meaningfully larger fraction of total particle burden. Reducing refined carb intake tends to lower triglycerides and VLDL production, modestly reducing overall ApoB levels over time.

Effects are most pronounced in people who already have elevated triglycerides, and vary considerably by individual. Think of this as dialing down the rate of new particle production, not eliminating it — genetics, overall diet composition, and other factors all play a role.

Aerobic exercise stimulates lipoprotein lipase, an enzyme that breaks down triglycerides within VLDL particles, reducing their concentration in blood. Resistance training works differently: it improves insulin sensitivity and body composition, both linked to lower triglyceride production and better overall lipid profiles over time. The combination appears to produce additive effects. Individual responses vary considerably based on genetics, baseline fitness, diet quality, and sleep.

Short sleep duration and elevated cortisol from chronic stress both disrupt the hormonal environment the liver needs to manage lipid production efficiently. Studies consistently find that people sleeping fewer than 6 hours per night tend to have higher triglycerides and worse lipid profiles on average. Stress activates the HPA axis, driving cortisol and catecholamines that can elevate triglycerides and LDL. Individual responses vary — but the mechanisms are real.

The gap between the top and bottom of this table is significant. Statins have decades of cardiovascular outcome data; nattokinase has almost none for lipid effects specifically. Be skeptical of marketing claims, and discuss anything prescription-adjacent with your physician.

Educational content only — not medical advice. Consult your physician before changing medications or supplements, particularly if you have existing cardiovascular conditions.