Does dark chocolate or cocoa benefit your heart?
Dark chocolate with a high cocoa content appears to be beneficial for the heart, but the evidence remains observational. A small daily portion of dark chocolate is worthwhile, but large amounts are not, given the calorie content.
Dark chocolate with a high cocoa content has been linked to beneficial effects on the heart and blood vessels in multiple studies. Flavanols, the active compounds in cocoa, help relax blood vessels via nitric oxide, suppress inflammation, and reduce platelet clotting. How strong those effects are in practice has not yet been fully proven in humans; a portion of the evidence comes from laboratory and mechanistic studies.
What makes the health benefits of dark chocolate more concrete: in three large American cohort studies involving more than 192,000 participants, eating five or more portions of dark chocolate per week was linked to a 21% lower risk of type 2 diabetes. That is relevant for the heart, because diabetes substantially raises the risk of cardiovascular disease. For each additional portion per week, the risk falls by around 3%. The same large cohort studies also show favourable associations with blood pressure and vascular health, but this is observational research. No firm cause-and-effect conclusion can be drawn from it.
Dark chocolate contains saturated fat, but that does not appear to cancel out the beneficial effect. A comprehensive review concluded that dark chocolate, despite its fat content, is not linked to a higher risk of cardiovascular disease. What matters is the food as a whole, not any single component.
For milk chocolate the opposite is true. It showed no protective effect and was instead associated with weight gain. The beneficial effects are specific to dark chocolate with a high cocoa content. In addition, chocolate is calorie-dense: consuming it in too large amounts leads to weight gain, which is itself a risk factor for cardiovascular disease. Experts speak of 'moderate amounts', although an exact portion size is rarely defined.
The evidence is predominantly associative (cohort studies, reviews). There are as yet no well-designed randomised clinical trials that prove a direct protective effect against heart disease in humans. Some of the biological mechanisms have also only been demonstrated in the laboratory.
Is coffee good or bad for your heart?
For most healthy adults, three to four filtered cups per day are associated with a beneficial effect on the heart and blood vessels. Pregnant women are an important exception: for them, the maximum is one to two cups per day.
Is the Mediterranean diet really good for your heart, and why?
For people with an elevated cardiovascular risk, the Mediterranean diet is the best-supported dietary choice currently available. Both large trials and dozens of population studies confirm a lower risk of heart attack and stroke.
Do omega-3 (fish oil) supplements benefit my heart?
Fish oil has a modest, proven effect on triglycerides and possibly slightly fewer heart attacks, but does not demonstrably reduce the overall risk of death. If you already have heart problems or are at high risk, it is worth discussing with your doctor.
Is a calcium score of my heart worth doing?
For people aged 40 to 75 in a grey zone regarding statins, a calcium score is a well-supported tool for making a considered decision about medication together with your doctor.
Does CoQ10 help your heart or your energy levels?
In heart failure, there are promising signals that CoQ10 can reduce the risk of death and hospitalisation, but the evidence is not yet strong enough for a standard recommendation. For healthy people seeking extra energy, the available studies offer no basis for this use.
Does climbing stairs actually do anything for my heart?
Yes, climbing stairs genuinely does something for your heart. Climbing roughly 50 to 100 steps a day is associated with fewer heart attacks, strokes and irregular heart rhythms, though this is based on observational studies, not experiments.