Cocoa flavanols act mainly on blood vessels: regular intake widens arteries, lowers blood pressure — most in those whose pressure is already raised — and modestly lowers cholesterol. Whether this prevents heart events is less clear. Memory, skin and blood-sugar findings are mixed. Ordinary chocolate is a poor carrier, and cocoa concentrates cadmium and lead, varying widely between products. (Full Review)
| Marker | Target | Why |
|---|---|---|
| Home blood pressure, seated | Below 120/75 mmHg | The largest and fastest measurable effect |
| High-sensitivity C-reactive protein | Below 0.5 mg/L | Tracks the inflammation signal seen in the long trial |
| Low-density lipoprotein cholesterol | Below 80 mg/dL | Detects the lipid effect |
| Apolipoprotein B | Below 70 mg/dL | Counts artery-clogging particles directly, which a cholesterol figure only approximates |
| Fasting glucose | 75–85 mg/dL | Captures the small pooled glucose effect |
| Glycated hemoglobin | 4.8–5.2% | Confirms whether the fasting change is real over months |
| Fasting insulin | Below 5 µIU/mL | Detects insulin resistance, the endpoint the clamp study failed to move |
| Whole-blood cadmium | Below 0.5 µg/L in non-smokers | The contamination risk with the longest biological memory |
| Blood lead | Below 1.0 µg/dL | The second contamination marker, with faster turnover |
| Estimated glomerular filtration rate | Above 90 mL/min/1.73 m² | The kidney is where retained cadmium shows up first |
| Ferritin | 50–100 ng/mL in men, 40–70 ng/mL in women | Detects the slow iron-absorption penalty of daily polyphenol intake |
| Resting heart rate and sleep architecture | No established target for this intervention; track change from the individual's own pre-start baseline | Detects the methylxanthine load from powder or chocolate delivery |
Cadence: Home blood pressure at four and eight weeks; lipids, inflammation and glucose markers at three months, then every six to twelve months; metal levels annually.