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The aim of this research was to evaluate the effects of adding 10 g of cocoa-rich chocolate (99%) to the habitual diet on cognitive performance in postmenopausal women. Following a randomised controlled parallel clinical trial, a total of 140 postmenopausal women aged 50–64 were recruited. The intervention group ( n  = 73) consumed daily 10 g of chocolate (99% cocoa) in addition to their usual food intake for 6 months, whereas the control group ( n  = 67) did not receive any intervention. Attention and executive functions, verbal memory, working memory, phonological fluency, category fluency and clinical variables were assessed at baseline and 6 months. Trail Making Test B execution time showed a decreased of −12.08 s (95% CI: −23.99, −0.18;  p  = 0.047) in the intervention group compared to the control group, after adjusting for age, educational level, time elapsed from the beginning of menopause and daily energy consumption (Cohen’s  d  = −0.343). Attention, immediate or delayed verbal memory, phonological or category fluency, and working memory remained unchanged. The consumption of cocoa-rich (99%) chocolate in addition to the habitual diet could be related to a slight improvement in cognitive performance regarding cognitive flexibility and processing speed in postmenopausal women, with no changes in the rest of the cognitive performance variables evaluated. Trial registration:  This clinical trial has been registered at clinicaltrials.gov as NCT03492983.

Effects of cocoa-rich chocolate on cognitive performance in postmenopausal women. A randomised clinical trial