Body regulates hormone crucial for motivation and tension response, reveals research New research has revealed a previously unidentified mechanism in your body which regulates a hormone that’s crucial for motivation, stress responses and control of blood circulation pressure, appetite and pain. The breakthrough could possibly be used to create drugs to greatly help fight health issues linked to these functions later on. Experts at the University of Bristol and University University London discovered that lactate – essentially lactic acid – causes cells in the mind to release even more noradrenaline , a neurotransmitter and hormone which is fundamental for human brain function .