In this meta-analysis study, researchers reviewed studies
exploring the effects of flavanol-rich cocoa products on blood
pressure. Their review included the data from 20 randomized
controlled studies, which included 856 healthy adult
participants. In these studies, participants consumed between 30
mg and1,080 mg (average 546 mg) of flavanols daily, in 3.6 grams
to 105 grams of cocoa products. Interventions lasted 2 to 18
weeks (average 4.4 weeks). Control groups received either a
flavanol-free product or a low-flavanol cocoa powder. Blood
pressure was monitored. Results showed a small but statistically
significant 2 to 3 mmHg reduction in blood pressure in the
flavanol-rich chocolate groups compared with control groups.
This effect was seen in trials that lasted less than two weeks
but not in trials lasting more than two weeks, and the
intervention appeared more effective for people 18 to 45 years
old compared with older people. “The reduction in blood pressure
of about 2–3 mmHg might complement other treatme