Well, this massive million drinker meta-analysis of coffee consumption (high levels, 5 cups a day) shows it significantly improves cardiovascular health. [1]

> A nonlinear association between coffee consumption and CVD risk was observed in this meta-analysis. Moderate coffee consumption was inversely significantly associated with CVD risk, with the lowest CVD risk at 3 to 5 cups per day, and heavy coffee consumption was not associated with elevated CVD risk.

[1] https://www.ahajournals.org/doi/full/10.1161/circulationaha....