Breakfast Consumption versus Breakfast Skipping: The Effect on Nutrient Intake, Weight, and Cognition

Carol E. O’Neil and Theresa A. Nicklas

Foods consumed at the breakfast meal are culturally different, but to most individuals, when they hear the local word for “breakfast,” it is understood what is meant. However, for researchers, nutrition educators, and nutrition policy makers there is no standard definition of breakfast, breakfast consumers, or breakfast skippers. This hinders interpretation of individual articles and makes it difficult to compare the literature. It has also led to conflicting results, compounding the difficulty for educators and policy makers to make recommendations for what to consume at breakfast. 

Breakfast has also been heralded as the “most important meal of the day,” not only because it is for most people the first major eating episode after the longest period without eating, but because it has been championed as a meal that contributes significantly to nutrient intake, can be used to lose weight or maintain a weight loss, and improve cognition and school performance in children. But is it the most important meal? There are two considerations here – what does “important” mean? Again, there is no definition. Further, how does the contribution of the breakfast meal to nutrient intake, weight management, or cognition compare with other meals and snacks? Breakfast has been intensively studied – lunch, dinner, and snacks, less so. 

How breakfast consumption or breakfast skipping is defined influences the results of studies. In general, nutrient intake and diet quality is better if breakfast is consumed. Weight and weight management also depends on the type of breakfast consumed. It has been demonstrated clearly that the type of breakfast consumed affects nutrient intake, diet quality, and weight; therefore, a simple definition of “breakfast” does not significantly add to the literature. Less well defined is the role breakfast plays in the cognition of students. Although accepted as fact, results evaluating acute and chronic consumption of breakfast and cognition are equivocal. Systematic reviews and one carefully conducted clinical trial have suggested that there is no association between consumption of breakfast and cognition in school-age children. 

More carefully controlled studies that use a standardized definition of breakfast consumption and breakfast skipping are needed to determine the effects of nutrient intake, health parameters, and academic performance. In addition, equivalent studies of the lunch and dinner meals are also needed, before it can be determined if “breakfast is the most important meal of the day.”

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