Flaxseed is a low-cost food combining plant omega-3 fat, fiber, and beneficial plant compounds. The strongest evidence shows modest lowering of blood pressure and "bad" cholesterol, clearest in people with elevated levels using ground seed consistently for months. Smaller benefits include better blood sugar, regularity, and modest weight loss. Risks are mostly mild and digestive. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Blood pressure | <120/80 mmHg | Flaxseed's best-supported effect |
| LDL cholesterol | <100 mg/dL (lower if high-risk) | Tracks the cholesterol-lowering effect |
| Apolipoprotein B (ApoB) | <80 mg/dL | Particle count; more precise cardiovascular marker than LDL alone |
| Lipoprotein(a) — Lp(a) | <30 mg/dL (or <75 nmol/L) | Flaxseed uniquely may lower this inherited risk factor |
| HbA1c | <5.4% | Reflects average blood sugar; captures glycemic benefit |
| Fasting glucose | 70–90 mg/dL | Complements HbA1c for glucose effect |
| hs-CRP | <1.0 mg/L | Captures the anti-inflammatory signal |
| eGFR / creatinine | eGFR >90 mL/min/1.73 m² | Kidney function; relevant to long-term cadmium exposure |
| Omega-3 index | >8% | Gauges whether ALA is translating into long-chain omega-3 status |
Cadence: Baseline, then 8–12 weeks after starting, then every 6–12 months for long-term use