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A brain is an organ that serves as the center of the nervous system in all vertebrate and most invertebrate animals.

It is located in the head, usually close to the sensory organs for senses such as vision.

It is the most complex organ in a vertebrate's body.

In a human, the cerebral cortex contains approximately 14–16 billion neurons, and the estimated number of neurons in the cerebellum is 55–70 billion.

Each neuron is connected by synapses to several thousand other neurons.

These neurons typically communicate with one another by means of long fibers called axons, which carry trains of signal pulses called action potentials to distant parts of the brain or body targeting specific recipient cells.

Health, according to the World Health Organization, is "a state of complete physical, mental and social well-being and not merely the absence of disease and infirmity".

A variety of definitions have been used for different purposes over time.

Health can be promoted by encouraging healthful activities, such as regular physical exercise and adequate sleep, and by reducing or avoiding unhealthful activities or situations, such as smoking or excessive stress.

Some factors affecting health are due to individual choices, such as whether to engage in a high-risk behavior, while others are due to structural causes, such as whether the society is arranged in a way that makes it easier or harder for people to get necessary healthcare services.

Still, other factors are beyond both individual and group choices, such as genetic disorders.

An Amblypodia anita (purple leaf blue butterfly) gathering nutrients from guano.

Nutrition is the biochemical and physiological process by which an organism uses food to support its life.

It provides organisms with nutrients, which can be metabolized to create energy and chemical structures.

Failure to obtain sufficient nutrients causes malnutrition.

Nutritional science is the study of nutrition, though it typically emphasizes human nutrition.

Lifestyle is the interests, opinions, behaviours, and behavioural orientations of an individual, group, or culture.

The term was introduced by Austrian psychologist Alfred Adler in his 1929 book, The Case of Miss R., with the meaning of "a person's basic character as established early in childhood".

The broader sense of lifestyle as a "way or style of living" has been documented since 1961.

Lifestyle is a combination of determining intangible or tangible factors.

Tangible factors relate specifically to demographic variables, i.e. an individual's demographic profile, whereas intangible factors concern the psychological aspects of an individual such as personal values, preferences, and outlooks.

A phrenological mapping of the brain.

Phrenology was among the first attempts to correlate mental functions with specific parts of the brain.