In 1948, WHO defined health as "a state of complete physical, mental, and social wellbeing and not merely the absence of disease or infirmity". Brain health must be the key to health, as defined by WHO, because the brain is the agent of all our actions and the mediator of all our experiences. However, neurological, psychiatric, and social researchers seldom work together to achieve brain health.Perhaps a major reason for this lack of coordination is the absence of a consensual definition of brain health and of objective methods for quantifying it. The current neurological definitions focus on absence of disease, and do not take into consideration mental health, wellbeing, and happiness. We propose a definition of brain health in adults as a state of complete physical, mental, and social wellbeing through the continuous development and exercise of the brain.
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