Over a 13-year study period, researchers in Denmark found that men who ate two to six 1-ounce servings of dark chocolate a week had a 23 percent lower risk of developing atrial fibrillation (AFib) than those who ate lesser or different amounts.

Women who had one weekly serving of chocolate had a 21 percent lower risk of developing AFib.

Those who ate the lowest amount — one to three 1-ounce servings a month — had the smallest risk reduction, but it was still 10 percent lower than those who  ate no dark chocolate at all.

The study also found:

• A 17 percent lower risk of atrial fibrillation for those who had one weekly serving of chocolate

• A 20 percent lower risk for those who ate two to six weekly servings

• A 14 percent lower risk for those ate one or more daily servings

Men who consumed two to six servings of chocolate a week had the greatest risk reduction — 23 lower risk.