Plain chocolate is naturally rich in flavanols, plant chemicals believed to protect the heart.

But the editorial in The Lancet points out many manufacturers remove flavanols from chocolate because of their bitter taste.

Last month, research published in the journal Circulation showed that flavanol-rich chocolate improved heart function in 11 heart transplant patients.

Another study showed eating small amounts of dark chocolate can lower high blood pressure.

However, there was a catch for lovers of dark chocolate too.

Despite the welcome presence of flavanols, "the devil in the dark chocolate" was the fat, sugar and calories it contained, said The Lancet.

Source: Daily Post; Liverpool. Provided by ProQuest Information and Learning. Powered by Yellowbrix.

Is chocolate really good for you? Find out.

Healthy chocolate: Too good to be true?

From flirting to dating to marriage ... Our Relationships & Love newsletter has the best advice for your relationship.