Grazing, cognitive performance and mood.

Area of Science:

• Nutrition Science
• Cognitive Psychology

Background:

• Meal frequency and timing are hypothesized to influence cognitive function.
• Previous research has not extensively explored the impact of spreading food intake across multiple occasions on cognitive performance.

Purpose of the Study:

• To investigate the effects of consuming food in two versus four occasions on mood and cognitive functions.
• To determine if altering meal frequency impacts verbal reasoning accuracy and task completion speed.

Main Methods:

• Two experiments were conducted: Experiment 1 (n=96) used a between-subjects design comparing two versus four milkshake occasions. Experiment 2 (n=24) used a cross-over design with halved meals versus four meals.
• Cognitive performance was assessed using verbal reasoning tasks and a visual search task.

Main Results:

• Spreading food intake over four occasions significantly improved verbal reasoning accuracy in both experiments.
• Errors in verbal reasoning were reduced by 30-40% when intake was spread across four meals.
• Task completion speed increased in a five-item visual search task with more frequent meals.

Conclusions:

• Consuming meals more frequently (four occasions) enhances cognitive functions, specifically verbal reasoning accuracy and processing speed.
• The findings suggest that the timing and distribution of food intake play a crucial role in cognitive performance.
• Further research is needed to elucidate the underlying physiological and neurological mechanisms responsible for these cognitive enhancements.