Walnuts May Improve Mood Through Diet, Not Serotonin Boost, Study Suggests
A recent crossover trial indicates that consuming walnuts may lead to a slight improvement in mood, though not due to a direct increase in brain serotonin levels. The study involved healthy adults who ate approximately 1.5 handfuls (40 grams) of walnuts daily for eight weeks, followed by an eight-week period without nuts. During the walnut consumption phase, participants reported a mood improvement of about 5 points on a 'total mood disturbance' questionnaire. However, specific measures of stress, well-being, and depressed mood did not show significant changes. Researchers suggest that the observed mood shifts are more likely a result of improved overall eating patterns, as individuals who add nuts to their diet often reduce their intake of less healthy foods. Walnuts also contribute to gut health, and the gut-brain connection is recognized as a factor in mood regulation, although a direct link between walnuts and this effect has not yet been established. The serotonin found in walnuts does not cross the b...
