We studied cognitive function and metabolic status in a group of healthy adolescents fed the government supplied breakfast (n = 18) versus a control group (n = 16) fed a very low calorie meal. Serum glucose and beta-hydroxybutyrate levels were repeatedly measured at predetermined intervals throughout the testing period. Acute cognitive and mood effect were evaluated in all subjects on a pre-post basis. No significant group differences emerged on a battery of psychological measures that assessed short-term auditory memory, vigilance, impulsivity, and mood. Neither serum glucose or beta-hydroxybutyrate levels correlated significantly with any behavioral measure. Results are discussed in the context of previous studies of nutrition and cognition.