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Health is the level of functional or metabolic efficiency of a living organism.

Health is the level of functional or metabolic efficiency of a living organism. In humans it is the ability of individuals or communities to adapt and self-manage when facing physical, mental or social challenges.

The World Health Organization (WHO) defined health has evolved over time, in keeping with the biomedical perspective, early definitions of health focused on the theme of the body's ability to function; health was seen as a state of normal function that could be disrupted from time to time by disease.

Health is a resource for everyday life, not the objective of living; it is a positive concept, emphasizing social and personal resources, as well as physical capacities". Thus, health referred to the ability to maintain homeostasis and recover from insults. Mental, intellectual, emotional, and social health referred to a person's ability to handle stress, to acquire skills, to maintain relationships, all of which form resources for resiliency and independent living.

Systematic activities to prevent or cure health problems and promote good health in humans are undertaken by health care providers. Applications with regard to animal health are covered by the veterinary sciences. The term "healthy" is also widely used in the context of many types of non-living organizations and their impacts for the benefit of humans, such as in the sense of healthy communities, healthy cities or healthy environments. In addition to health care interventions and a person's surroundings, a number of other factors are known to influence the health status of individuals, including their background, lifestyle, and economic, social conditions, and spirituality; these are referred to as "determinants of health." Studies have shown that high levels of stress can affect human health.

The concept of the "health field," as distinct from medical care, the report identified three interdependent fields as key determinants of an individual's health. These are:

- Lifestyle: the aggregation of personal decisions (i.e., over which the individual has control) that can be said to contribute to, or cause, illness or death;

- Environmental: all matters related to health external to the human body and over which the individual has little or no control;

- Biomedical: all aspects of health, physical and mental, developed within the human body as influenced by genetic make-up.

Focusing more on lifestyle issues and their relationships with functional health, people can improve their health via exercise, enough sleep, maintaining a healthy body weight, limiting alcohol use, and avoiding smoking. Health and illness can co-exist, as even people with multiple chronic diseases or terminal illnesses can consider themselves healthy. Eating a variety of colorful food provides vitamins, minerals, and antioxidants to nourish your body that can’t be replicated in a supplement. Different colored foods play different roles in the body. Aim for at least three colors at every meal and two servings of fruit and three servings of vegetables over the course of the day.

The one health issue that is the most unfortunate because the majority of these health issues are preventable is that approximately 1 billion people lack access to health care systems. It is easy to say that the most common and harmful health issue is that a lot of people do not have access to quality remedies.