Breakfast may modulate the
short-term metabolic responses to fasting conditions to
maintain a supply of nutrients to the central nervous
system, or through long-term effects on nutrient intake
and status that may positively affect cognition (17). The
effects might be attributable to enhanced blood glucose
concentrations (17,141). However, several experimental
studies have shown no significant overall association between
test performance and blood glucose concentrations
(142-145), suggesting that other mechanisms, possibly
changes in neurotransmitter concentrations (146), may
play a role.