Dark chocolate with high cocoa content can affect colonic functionality and stimulate certain brain regions in healthy adults.
The study involved a controlled, randomised experiment including healthy volunteers who were given 100g of either dark chocolate (with 72% cocoa content) or white chocolate (with no cocoa content) for five consecutive days. The volunteers then recorded any abdominal symptoms and stool consistency using the Bristol Stool Score. Gastric emptying as well as intestinal and colonic transit time were examined using scintigraphy and marker studies, while the activity in different brain regions was assessed using combined positron emission tomography-computed tomography imaging techniques.
The study found that dark chocolate did not alter the functionality of the upper gastrointestinal tract. Nevertheless, it was observed that the consumption of dark chocolate led to harder stool consistency. As for the brain, an increased uptake of fluorodeoxyglucose was noticed within the visual cortex, with other regions like the somatosensory, motor and pre-frontal cortices also showing heightened activity. This suggests that dark chocolate may potentially influence certain brain functions.
