As a dietitian I am often the recipient of evil looks as I start to discuss sweets. “Just don’t take away my chocolate” a client says to me. Given this, I am happy to report each time research shows something positive about the treat.
First, let me explain the background. Think of our vascular system (arteries and veins) as a set of flexible tubes that span the body and through which the heart sends out nutrients. Each tube can expand or contract to allow more or less blood through. Atherosclerosis brings impaired ability to expand the arteries, called endothelial disfunction. People with diabetes and/or high blood pressure seem to be at an increased risk for developing endothelial disfunction.
A recent study found acute improvement in endothelial function with the consumption of dark chocolate or cocoa. Interestingly, sugar-free cocoa (90 calories) did a better job dilating the arteries and lowering blood pressure than did the full-sugar drink (460 calories). Thus, you can enjoy the improved vascular function without sacrificing your waistline.
Be careful not to run wild with these results. Another study failed to show benefit in cardiac patients fed daily cocoa. Also, chocolate (both dark and milk) is high in saturated fat which is known to increase harmful blood cholesterol.
Consider adding a box of sugar-free cocoa to your cupboard for the fall/winter. If you drink it on a day when you are feeling stressed, you will likely garner some benefit. Furthermore, consume dark chocolate in moderation and thoroughly enjoy it when you do.
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Faridi, Z, et. al., Acute dark chocolate and cocoa ingestion and endothelial function: a randomized controlled crossover trial. Am J Clin Nutr 2008;88:58-63
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