"Neurochemical" refers to the chemicals in our brains and nervous systems that help transmit messages and control our thoughts, feelings, and actions. Full definition
We feel sadder when we're hungry due to a lack of neurochemicals in the brain. (healthcentral.com)
Caffeine may also modulate central fatigue, a type of fatigue caused by neurochemical changes in the brain associated with prolonged exercise, and in turn influence ratings of perceived exertion, perceived pain, and levels of vigour, all of which are likely to lead to improvements in performance11, 12. (coffeeandhealth.org)
Over the long term, excessive discharge of epinephrine and norepinephrine can lead to the suppression of cellular immune functioning; produce hemodynamic changes, such as increased pressure in heart rate; provoke variations in normal heart rhythms; and produce neurochemical imbalances that may contribute to the development of psychiatric disorders. (pnas.org)