How many stages are in Hans Selyes adaptation?

Hans Selye's adaptation theory, known as the General Adaptation Syndrome (GAS), consists of three stages: the alarm reaction, the resistance stage, and the exhaustion stage. The alarm reaction is the initial response to stress, where the body prepares to fight or flee. In the resistance stage, the body tries to adapt to the ongoing stressor, while in the exhaustion stage, prolonged stress leads to a depletion of resources and can result in negative health consequences.