Health guide, information on health

 Information on Health: ?

Introduction
Health is the absence of illness, functionally, as the ability to cope with everyday activities, or positively, as fitness and well-being. In any organism, health is a form of homeostasis. This is a state of balance, with inputs and outputs of energy and matter in equilibrium (allowing for growth). Health also implies good prospects for continued survival. In sentient creatures such as humans, health is a broader concept.
By WHO:The World Health Organization defines health as "a state of complete physical, mental and social well-being, and does not consist only of the absence of disease or infirmity." Using the WHO definition classifies 70-95% of people as unhealthy. A deeper inquiry into the definition of "health" reveals that what makes a cell healthy is unique from what makes an organism healthy.

Heath Care
Health care or healthcare is the prevention, treatment, and management of illness and the preservation of mental and physical well-being through the services offered by the medical and allied health professions
The healthcare industry is one of the world's largest and fastest-growing industries, consuming over 10 percent of gross domestic product of most developed nations.

Medicine
Medicine is a branch of health science concerned with maintaining health and restoring it by treating disease. Medicine is both an area of knowledge (a science of body systems, diseases and their treatment), and the application of that knowledge (by the medical profession and other health professionals such as nurses, physiotherapists etc.) The various specialized branches of the science of medicine correspond to equally specialized medical professions dealing with particular organs or diseases. The medical profession refers to the social structure of the group of people formally trained to apply medical knowledge to treat disease. Many countries have legal limitations as to who may practice medicine.

Longevity
Longevity is long life or existence. Reflections on longevity have usually gone beyond acknowledging the basic shortness of human life and included thinking about, and conceiving, methods to extend life (indefinitely).

Future
The mainstream view on the future of longevity, such as the US Census Bureau, is that life expectancy in the USA will be in the mid-80s by the year 2050 (up from 77 today) and will top out eventually in the low 90s, barring major scientific advances that can change the rate of human aging itself, as opposed to merely treating the effects of aging as is done today. The Census Bureau also predicted that the USA would have 5.3 million people aged over 100 in 2100.

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