A person may be in perfect physical condition, but feel too tired and “blue” to go to work, while his co-worker, a diabetic, is at work, functioning fully and accomplishing his job.

The individual’s state of health is determined by the ability to adapt to changes in the following dimensions:

• Developmental–changes in a person’s behavior and ability, which are associated with increasing age.
• Psychosocial–the development of the personality, social attitudes, and skills.
• Cultural–changes in or development of beliefs and values held by the individual’s family or culture.
• Physiological–changes in body function.