Public health has been described as "the science and art of preventing disease, prolonging life and promoting health through the organized efforts and informed choices of society, organizations, public and private, communities and individuals."[51] It is concerned with threats to the overall health of a community based on population health analysis. The population in question can be as small as a handful of people or as large as all the inhabitants of several continents (for instance, in the case of a pandemic). Public health has many sub-fields, but typically includes the interdisciplinary categories of epidemiology, biostatistics and health services. Environmental health, community health, behavioral health, and occupational health are also important areas of public health.
Public health also takes various actions to limit the health disparities between different areas of the country and, in some cases, the continent or world. One issue is the access of individuals and communities to health care in terms of financial, geographical or socio-cultural constraints to accessing and using services.[53] Applications of the public health system include the areas of maternal and child health, health services administration, emergency response, and prevention and control of infectious and chronic diseases.
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.

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My wife, son and I have been on the Wellness Program and since we have been taking core health our energy is amazing.  My son notices a difference when he does not take it and we have not gotten sick this winter which is usually inevitable. I know by taking a whole food supplement it has built our immune system to fight the common colds and flu.  My family and I love the product and are grateful for what it has done for our health.
Across 15 locations—from Portland’s four westside and three eastside offices, to our clinics in Gresham, Happy Valley, Hillsboro, Newberg, Oregon City and Tualatin—we’re a team of more than 120 physicians, certified nurse-midwives, nurse practitioners and genetic counselors committed to giving you the best care and support possible. We’re here for you--now with Portland's first out-of-hospital, natural birth center integrated with an OB/GYN specialty practice. 
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In order to complete your transaction, we will share the name, billing and shipping address and other order information associated with your purchase with the publisher or magazine vendor. Your name and address will also be shared with a circulation-auditing organization. We may share your e-mail with the publisher, but you can control how it will be used in Subscription Manager. We will not share your credit card information. Offers on this page are introductory. See Details.
Did you know that half of pregnancies in the U.S. are not planned? And did you know that planned pregnancies are better for mothers' and infants' health? That's why the U.S. Office of Population Affairs and the Centers for Disease Control and Prevention recently released formal recommendations on family planning services. I spoke with Susan B. Moskosky, acting director of the Office of Population Affairs, to learn more about quality family planning and why it matters.
In the first decade of the 21st century, the conceptualization of health as an ability opened the door for self-assessments to become the main indicators to judge the performance of efforts aimed at improving human health[16]. It also created the opportunity for every person to feel healthy, even in the presence of multiple chronic diseases, or a terminal condition, and for the re-examination of determinants of health, away from the traditional approach that focuses on the reduction of the prevalence of diseases[17].
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