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One widely accepted definition of health is that of the [[World Health Organization]] "WHO". It states that "health is a state of complete physical, mental र social well-being र not merely the absence of disease or infirmity" (WHO, 1946). In more recent years, this statement has been modified to include the ability to lead a "socially र economically productive life." The WHO definition is not without criticism, as some argue that health cannot be defined as a state at all, but must be seen as a process of continuous adjustment to the changing demands of living र of the changing meanings we give to life. The WHO definition is therefore considered by many as an idealistic goal rather than a realistic proposition.
The [[LaLonde report]] suggested that there are four general determinants of health which he called "human biology", "environment", "lifestyle", र "healthcare organization"<ref name="Lalonde">Lalonde, Marc. [http://www.hc-sc.gc.ca/hcs-sss/alt_formats/hpb-dgps/pdf/pubs/1974-lalonde/lalonde_e.pdf "A New Perspective on the Health of Canadians."] Ottawa: मन्त्री of Supply र Services; 1974.</ref> Thus, health is maintained through the science र practice of [[medicine]], but can also be improved by individual effort. [[Physical fitness]], [[weight loss]], [[healthy eating]], [[stress management]] training र [[Smoking cessation|stopping smoking]] र other [[substance abuse]] are examples of steps to improve one's health. Workplace programs are recognized by an increasingly large number of companies for their value in improving health र well-being of their employees, र increasing morale, loyalty र productivity at work. A company may provide a gym with exercise equipment, start smoking cessation programs, provide [[nutrition]], [[Weight loss|weight]] or stress management training. Other programs may include health risk assessments, health screenings र [[body mass index]] monitoring.
An increasing measure of the health of populations is height, which is strongly regulated by nutrition र health care, among other standard of living र quality of life matters. The study of human growth, its regulators र its implications is known as [[auxology]].
[[Image:MyPyramid1.png|right|thumb|270px|The updated [[United States Department of Agriculture|USDA]] [[MyPyramid|food pyramid]], published in [], is a general nutrition guide for recommended [[food]] consumption.]]
[[Nutrition]] is a [[science]] which studies the relationship between [[diet (nutrition)|diet]] र states of health र [[disease]]. [[Dietitian|Dieticians]] are [[Health professional]]s who are [[specialized]] in this area of [[expertise]]. They are also the only highly trained health professionals able to provide safe, evidence-based र accurate dietary advice र interventions.
Between the extremes of optimal health र death from [[starvation]] or [[malnutrition]], there is an array of disease states that can be caused or alleviated by changes in diet. Deficiencies, excesses र imbalances in diet can produce negative impacts on health, which may lead to diseases such as [[scurvy]], [[obesity]] or [[osteoporosis]], as well as psychological र behavioral problems. Moreover, excessive ingestion of elements that have no apparent role in health, (e.g. [[lead]], [[mercury (element)|mercury]], [[Polychlorinated biphenyl|PCBs]], [[dioxins]]), may incur [[toxic]] र potentially lethal effects, depending on the dose. The science of nutrition attempts to understand how र why specific dietary aspects influence health.
** [[List of diets|Diets (list)]]