Dark chocolate studies does not come close to suggesting it improves cognition. Only 10 people involved and one study was not published.

Health Headlines Commentary for April 30, 2018


Dark chocolate may give your brain a boost, studies suggest


Dark chocolate (70% organic cacao) increases acute and chronic EEG power spectral density (μV2) response of gamma frequency (25–40 Hz) for brain health: enhancement of neuroplasticity, neural synchrony, cognitive processing, learning, memory, recall, and mindfulness meditation

No full text for this study:

Dark chocolate (70% cacao) effects human gene expression: Cacao regulates cellular immune response, neural signaling, and sensory perception


Dark chocolate and health: Fudging the evidence with USA Today