2-6 servings of dark chocolate/week is inversely associated with AF

Chocolate intake and risk of clinically apparent atrial fibrillation: the Danish Diet, Cancer, and Health Study

http://heart.bmj.com/content/early/2017/05/01/heartjnl-2016-310357
Elizabeth Mostofsky, et al.

https://www.hsph.harvard.edu/news/press-releases/chocolate-irregular-heartbeat

There has been extensive research showing that moderate consumption of chocolate, particularly dark chocolate, improves markers of cardiovascular health5 and is associated with a lower rate of myocardial infarction,6 heart failure,7 ,8 composite cardiovascular adverse outcome and cardiovascular mortality.9

Conclusions Accumulating evidence indicates that moderate chocolate intake may be inversely associated with AF risk, although residual confounding cannot be ruled out.

The higher flavonoid content of dark chocolate compared with milk chocolate may yield greater cardiovascular benefits. … In addition, flavanol content and total antioxidant capacity in plasma may be lower if cocoa is consumed with milk or if cocoa is ingested as milk chocolate.26 Furthermore, cocoa is usually consumed in high calorie products that use fat and sugar, and modern manufacturing of chocolate may result in losses of more than 80% of the original flavonoids from the cocoa beans.27 Therefore, it may be advantageous to find ways to consume cocoa in forms other than chocolate bars. The ongoing Cocoa Supplement and Multivitamin Outcomes Study is a large randomised trial testing the effect of a concentrated cocoa extract on cardiovascular risk, and may provide insight on the efficacy and feasibility of ingesting cocoa in this form.

In the European Union, milk chocolate must contain a minimum of 30% cocoa solids and dark chocolate must contain a minimum of 43% cocoa solids

Eating 2-6 servings of dark chocolate a week could cut risk of Irregular Heartbeat, study finds

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