Health science is the branch of science focused on health. There are two main approaches to health science: the study and research of the body and health-related issues to understand how humans (and animals) function, and the application of that knowledge to improve health and to prevent and cure diseases and other physical and mental impairments. The science builds on many sub-fields, including biology, biochemistry, physics, epidemiology, pharmacology, medical sociology. Applied health sciences endeavor to better understand and improve human health through applications in areas such as health education, biomedical engineering, biotechnology and public health.


Co payments were introduced in the 1980s in an attempt to prevent over utilization. The average length of hospital stay in Germany has decreased in recent years from 14 days to 9 days, still considerably longer than average stays in the United States (5 to 6 days).[25][26] Part of the difference is that the chief consideration for hospital reimbursement is the number of hospital days as opposed to procedures or diagnosis. Drug costs have increased substantially, rising nearly 60% from 1991 through 2005. Despite attempts to contain costs, overall health care expenditures rose to 10.7% of GDP in 2005, comparable to other western European nations, but substantially less than that spent in the U.S. (nearly 16% of GDP).[27]
Focusing more on lifestyle issues and their relationships with functional health, data from the Alameda County Study suggested that people can improve their health via exercise, enough sleep, maintaining a healthy body weight, limiting alcohol use, and avoiding smoking.[28] Health and illness can co-exist, as even people with multiple chronic diseases or terminal illnesses can consider themselves healthy.[29]
As the number of service sector jobs has risen in developed countries, more and more jobs have become sedentary, presenting a different array of health problems than those associated with manufacturing and the primary sector. Contemporary problems, such as the growing rate of obesity and issues relating to stress and overwork in many countries, have further complicated the interaction between work and health.
The national system of health insurance was instituted in 1945, just after the end of the Second World War. It was a compromise between Gaullist and Communist representatives in the French parliament. The Conservative Gaullists were opposed to a state-run healthcare system, while the Communists were supportive of a complete nationalisation of health care along a British Beveridge model.
As per the Constitution of Canada, health care is mainly a provincial government responsibility in Canada (the main exceptions being federal government responsibility for services provided to aboriginal peoples covered by treaties, the Royal Canadian Mounted Police, the armed forces, and Members of Parliament). Consequently, each province administers its own health insurance program. The federal government influences health insurance by virtue of its fiscal powers – it transfers cash and tax points to the provinces to help cover the costs of the universal health insurance programs. Under the Canada Health Act, the federal government mandates and enforces the requirement that all people have free access to what are termed "medically necessary services," defined primarily as care delivered by physicians or in hospitals, and the nursing component of long-term residential care. If provinces allow doctors or institutions to charge patients for medically necessary services, the federal government reduces its payments to the provinces by the amount of the prohibited charges. Collectively, the public provincial health insurance systems in Canada are frequently referred to as Medicare.[15] This public insurance is tax-funded out of general government revenues, although British Columbia and Ontario levy a mandatory premium with flat rates for individuals and families to generate additional revenues - in essence, a surtax. Private health insurance is allowed, but in six provincial governments only for services that the public health plans do not cover (for example, semi-private or private rooms in hospitals and prescription drug plans). Four provinces allow insurance for services also mandated by the Canada Health Act, but in practice there is no market for it. All Canadians are free to use private insurance for elective medical services such as laser vision correction surgery, cosmetic surgery, and other non-basic medical procedures. Some 65% of Canadians have some form of supplementary private health insurance; many of them receive it through their employers.[16] Private-sector services not paid for by the government account for nearly 30 percent of total health care spending.[17]
Germany has a universal multi-payer system with two main types of health insurance: law enforced health insurance (or public health insurance) (Gesetzliche Krankenversicherung (GKV)) and private insurance (Private Krankenversicherung (PKV)). Both systems struggle with the increasing cost of medical treatment and the changing demography. About 87.5% of the persons with health insurance are members of the public system, while 12.5% are covered by private insurance (as of 2006).[28] There are many differences between the public health insurance and private insurance. In general the benefits and costs in the private insurance are better for young people without family. There are hard salary requirements to join the private insurance because it is getting more expensive advanced in years.[29]
Based on the principle of solidarity and compulsory membership, the calculation of fees differs from private health insurance in that it does not depend on personal health or health criteria like age or sex, but is connected to one's personal income by a fixed percentage. The aim is to cover the risk of high cost from illness that an individual can not bear alone.[citation needed]

A recent study by PricewaterhouseCoopers examining the drivers of rising health care costs in the U.S. pointed to increased utilization created by increased consumer demand, new treatments, and more intensive diagnostic testing, as the most significant.[69] However, Wendell Potter, a long-time PR representative for the health insurance industry, has noted that the group which sponsored this study, AHIP, is a front-group funded by various insurance companies.[70] People in developed countries are living longer. The population of those countries is aging, and a larger group of senior citizens requires more intensive medical care than a young, healthier population. Advances in medicine and medical technology can also increase the cost of medical treatment. Lifestyle-related factors can increase utilization and therefore insurance prices, such as: increases in obesity caused by insufficient exercise and unhealthy food choices; excessive alcohol use, smoking, and use of street drugs. Other factors noted by the PWC study included the movement to broader-access plans, higher-priced technologies, and cost-shifting from Medicaid and the uninsured to private payers.[69]
Health insurance costs vary in many ways. Deductibles, premiums, and copayments all play into what your health insurance costs will come out to. eHealth studies have shown that in 2017 the average individual premium was $393 without any subsidies. By comparing quotes, and speaking with a licensed agent, you might be able to find prices significantly lower than this, that still meet your needs. Taking the time to shop around and compare can make a huge difference in what you’re paying for your health insurance.

The private health system in Australia operates on a "community rating" basis, whereby premiums do not vary solely because of a person's previous medical history, current state of health, or (generally speaking) their age (but see Lifetime Health Cover below). Balancing this are waiting periods, in particular for pre-existing conditions (usually referred to within the industry as PEA, which stands for "pre-existing ailment"). Funds are entitled to impose a waiting period of up to 12 months on benefits for any medical condition the signs and symptoms of which existed during the six months ending on the day the person first took out insurance. They are also entitled to impose a 12-month waiting period for benefits for treatment relating to an obstetric condition, and a 2-month waiting period for all other benefits when a person first takes out private insurance. Funds have the discretion to reduce or remove such waiting periods in individual cases. They are also free not to impose them to begin with, but this would place such a fund at risk of "adverse selection", attracting a disproportionate number of members from other funds, or from the pool of intending members who might otherwise have joined other funds. It would also attract people with existing medical conditions, who might not otherwise have taken out insurance at all because of the denial of benefits for 12 months due to the PEA Rule. The benefits paid out for these conditions would create pressure on premiums for all the fund's members, causing some to drop their membership, which would lead to further rises in premiums, and a vicious cycle of higher premiums-leaving members would ensue.


Heavy drinking does the body no favors. It can lead to weakened heart muscle and irregular heart rhythms, as well as dementia, cancer and stroke. But could drinking just a little be heart healthy? The science is unsettled. While some research suggests that moderate drinking (up to a drink a day for women and up to two for men) is linked with lower rates of cardiovascular disease, the research does not prove cause and effect, Gianos cautions. For example, it could be that people who drink regularly take time to relax with loved ones, and that may be what is providing the heart benefit.
The surviving infant remains healthy and will be closely monitored by Zoo personnel. — Katherine J. Wu, Smithsonian, "National Zoo Reports Death of Infant Golden Lion Tamarin," 2 July 2018 That often pushes aside the basic building blocks of a healthy life, such as proper sleep, exercise, and nutrition. — Clay Marsh, STAT, "Facing deaths of despair from the depths of despair in West Virginia," 12 July 2018 Findings of the study showed 8.2 million years of healthy life were lost due to diabetes attributable to air pollution in 2016 globally. — Hannah Holzer, sacbee, "Air pollution increases risk for type 2 diabetes, study finds," 12 July 2018 Children learned about biker safety and living healthier lives. — Dennis Hohenberger, Courant Community, "Children Learn Bike Safety," 3 July 2018 Our mission has always been to help people live healthier lives. — Carolyn Kylstra, SELF, "How Should a Health Brand Talk About Weight?," 25 June 2018 This process should bring us a step closer to what really matters: informing people who want to know how to eat for a healthy life. — Julia Belluz, Vox, "This Mediterranean diet study was hugely impactful. The science just fell apart.," 20 June 2018 Many say that being involved in different activities has made them happier and healthier. — City Bureau, Chicago Reader, "These candid photos capture how seniors are growing communities—while growing older—on the south side," 12 July 2018 All the activities are monitored by Nicklaus pediatric endocrinology nurses to ensure a safe and healthy environment, according to a news release. — Emily Himes, miamiherald, "Diabetic children learn about nutrition and keeping healthy at Camp Roaring Sun," 10 July 2018
Nobody pretends that we’re going to live in a meatless world anytime soon, but moderation can make a big difference. If you do eat meat, keep your portions small, go easy on sugar, processed carbs and butter, and help yourself to plenty of vegetables and fruits. Also keep in mind that the quality of the animal fat matters, Sass says. “Grass-fed and organic dairy and meats provide some beneficial fats that are not in conventionally produced animal foods.”

Usage Note: Some people insist on maintaining a distinction between the words healthy and healthful. In this view, healthful means "conducive to good health" and is applied to things that promote health, while healthy means "possessing good health," and is applied solely to people and other organisms. Accordingly, healthy people have healthful habits. However, healthy has been used to mean "healthful" since the 1500s, as in this example from John Locke's Some Thoughts Concerning Education: "Gardening ... and working in wood, are fit and healthy recreations for a man of study or business." In fact, the word healthy is far more common than healthful when modifying words like diet, exercise, and foods, and healthy may strike many readers as more natural in many contexts. Certainly, both healthy and healthful must be considered standard in describing that which promotes health.

1. well, sound, fit, strong, active, flourishing, hardy, blooming, robust, vigorous, sturdy, hale, hearty, in good shape (informal), in good condition, in the pink, alive and kicking, fighting fit, in fine form, in fine fettle, hale and hearty, fit as a fiddle (informal), right as rain (Brit. informal), physically fit, in fine feather She had a normal pregnancy and delivered a healthy child.


Products and services offered are underwritten by All Savers Insurance Company, Golden Rule Insurance Company, Sirius International Insurance Corporation, United States Fire Insurance Company, Health Plan of Nevada, Inc., Oxford Health Plans (NJ), Inc., UnitedHealthcare Benefits Plan of California, UnitedHealthcare Community Plan, Inc., UnitedHealthcare Insurance Company, UnitedHealthcare Life Insurance Company, UnitedHealthcare of Colorado, Inc., UnitedHealthcare of Alabama, Inc., UnitedHealthcare of Arkansas, Inc., UnitedHealthcare of Florida, Inc., UnitedHealthcare of Georgia, Inc., UnitedHealthcare of Kentucky, LTD., UnitedHealthcare of Louisiana, Inc., UnitedHealthcare of the Mid-Atlantic, Inc., UnitedHealthcare of the Midlands, Inc., UnitedHealthcare of the Midwest, UnitedHealthcare of Mississippi, Inc., UnitedHealthcare of New England, Inc., UnitedHealthcare of New York, Inc., UnitedHealthcare of North Carolina, Inc., UnitedHealthcare of Ohio, Inc., UnitedHealthcare of Oklahoma, Inc., UnitedHealthcare of Pennsylvania, Inc., UnitedHealthcare of Washington, Inc.
Products and services offered are underwritten by All Savers Insurance Company, Golden Rule Insurance Company, Sirius International Insurance Corporation, United States Fire Insurance Company, Health Plan of Nevada, Inc., Oxford Health Plans (NJ), Inc., UnitedHealthcare Benefits Plan of California, UnitedHealthcare Community Plan, Inc., UnitedHealthcare Insurance Company, UnitedHealthcare Life Insurance Company, UnitedHealthcare of Colorado, Inc., UnitedHealthcare of Alabama, Inc., UnitedHealthcare of Arkansas, Inc., UnitedHealthcare of Florida, Inc., UnitedHealthcare of Georgia, Inc., UnitedHealthcare of Kentucky, LTD., UnitedHealthcare of Louisiana, Inc., UnitedHealthcare of the Mid-Atlantic, Inc., UnitedHealthcare of the Midlands, Inc., UnitedHealthcare of the Midwest, UnitedHealthcare of Mississippi, Inc., UnitedHealthcare of New England, Inc., UnitedHealthcare of New York, Inc., UnitedHealthcare of North Carolina, Inc., UnitedHealthcare of Ohio, Inc., UnitedHealthcare of Oklahoma, Inc., UnitedHealthcare of Pennsylvania, Inc., UnitedHealthcare of Washington, Inc.
syn: healthy, healthful, wholesome refer to physical, mental, or moral health and well-being. healthy most often applies to what possesses health, but may apply to what promotes health: a healthy child; a healthy climate. healthful is usu. applied to something conducive to physical health: a healthful diet. wholesome, connoting freshness and purity, applies to something that is physically or morally beneficial: wholesome food; wholesome entertainment.

The Commonwealth Fund completed its thirteenth annual health policy survey in 2010.[8] A study of the survey "found significant differences in access, cost burdens, and problems with health insurance that are associated with insurance design".[8] Of the countries surveyed, the results indicated that people in the United States had more out-of-pocket expenses, more disputes with insurance companies than other countries, and more insurance payments denied; paperwork was also higher although Germany had similarly high levels of paperwork.[8]

Insurance companies are not allowed to have co-payments, caps, or deductibles, or to deny coverage to any person applying for a policy, or to charge anything other than their nationally set and published standard premiums. Therefore, every person buying insurance will pay the same price as everyone else buying the same policy, and every person will get at least the minimum level of coverage.

Personal health depends partially on the active, passive, and assisted cues people observe and adopt about their own health. These include personal actions for preventing or minimizing the effects of a disease, usually a chronic condition, through integrative care. They also include personal hygiene practices to prevent infection and illness, such as bathing and washing hands with soap; brushing and flossing teeth; storing, preparing and handling food safely; and many others. The information gleaned from personal observations of daily living – such as about sleep patterns, exercise behavior, nutritional intake and environmental features – may be used to inform personal decisions and actions (e.g., "I feel tired in the morning so I am going to try sleeping on a different pillow"), as well as clinical decisions and treatment plans (e.g., a patient who notices his or her shoes are tighter than usual may be having exacerbation of left-sided heart failure, and may require diuretic medication to reduce fluid overload).[56]
A recent study by PricewaterhouseCoopers examining the drivers of rising health care costs in the U.S. pointed to increased utilization created by increased consumer demand, new treatments, and more intensive diagnostic testing, as the most significant.[69] However, Wendell Potter, a long-time PR representative for the health insurance industry, has noted that the group which sponsored this study, AHIP, is a front-group funded by various insurance companies.[70] People in developed countries are living longer. The population of those countries is aging, and a larger group of senior citizens requires more intensive medical care than a young, healthier population. Advances in medicine and medical technology can also increase the cost of medical treatment. Lifestyle-related factors can increase utilization and therefore insurance prices, such as: increases in obesity caused by insufficient exercise and unhealthy food choices; excessive alcohol use, smoking, and use of street drugs. Other factors noted by the PWC study included the movement to broader-access plans, higher-priced technologies, and cost-shifting from Medicaid and the uninsured to private payers.[69]
In 2005, the Supreme Court of Canada ruled, in Chaoulli v. Quebec, that the province's prohibition on private insurance for health care already insured by the provincial plan violated the Quebec Charter of Rights and Freedoms, and in particular the sections dealing with the right to life and security, if there were unacceptably long wait times for treatment, as was alleged in this case. The ruling has not changed the overall pattern of health insurance across Canada, but has spurred on attempts to tackle the core issues of supply and demand and the impact of wait times.[18]
Mental illness is described as 'the spectrum of cognitive, emotional, and behavioral conditions that interfere with social and emotional well-being and the lives and productivity of people. Having a mental illness can seriously impair, temporarily or permanently, the mental functioning of a person. Other terms include: 'mental health problem', 'illness', 'disorder', 'dysfunction'.[38]
×