Blueberries' plant pigments help blood vessels relax, and improved blood-vessel function is the most dependable benefit. Effects on blood sugar and heart-disease risk factors are modest and less certain. Memory gains appear mainly in older, declining adults, and blood-pressure effects genuinely conflict. Very safe as a food; caution with concentrated extracts alongside blood-thinning or blood-sugar medicines. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Blood pressure | ~110–115 / 70–75 mmHg | Primary vascular endpoint blueberry may influence |
| Fasting glucose | 75–86 mg/dL | Tracks glycemic effect |
| Hemoglobin A1c | <5.3% | Average blood sugar over ~3 months |
| Fasting insulin | 2–5 µIU/mL | Detects insulin resistance responsive to blueberry |
| LDL cholesterol | <100 mg/dL (lower if higher risk) | Cardiometabolic lipid target |
| Triglycerides | <70 mg/dL | Sensitive to carbohydrate and metabolic status |
| High-sensitivity C-reactive protein | <1.0 mg/L (ideally <0.5) | Inflammation marker plausibly lowered |
| Oxidized LDL | Lower is better (no consensus cutoff) | Direct marker of the oxidative process blueberry may reduce |
Cadence: Baseline before starting, then ~3 months after starting, then every 6–12 months for maintenance