A study published in the British Journal of Nutrition (epublished September 19, 2011) examined the effects of walnut consumption on cognitive function, mood, and reasoning. The study involved 64 college students who participated in a randomized, placebo-controlled, crossover design. Participants consumed either walnuts or a placebo for eight weeks, followed by a six-week washout period, after which the groups were switched. The walnut-supplemented diet was associated with an 11.2% improvement in inferential verbal reasoning, while no significant changes were observed in memory, mood, or non-verbal reasoning.