The term energy is used by writers and practitioners of various esoteric forms of spirituality and alternative medicine to refer to a variety of phenomena. There is no scientific evidence for the existence of such energy.
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Therapies that purport to use, modify, or manipulate unknown energies are thus among the most contentious of all complementary and alternative medicines. Claims related to energy therapies are most often anecdotal (from single stories), rather than being based on repeatable empirical evidence.
History
Concepts such as "life force" and "élan vital" emerged from the debate over vitalism in the early 20th century and later inspired thinkers in the modern New Age movement.
As biologists studied embryology and developmental biology, particularly before the discovery of genes, a variety of organisational forces were posited to account for their observations. German biologist Hans Driesch (1867–1941), proposed entelechy, an energy which he believed controlled organic processes. However such ideas are discredited and modern science has all but abandoned the attempt to associate additional energetic properties with life.
According to Brian Dunning, the scientific term energy is, in fact, misused in the context of spirituality and alternative medicine:
That's all that energy is: a measurement of work capability. But in popular culture, 'energy' has somehow become a noun. "Energy" is often spoken of as if it is a thing unto itself, like a region of glowing power, that can be contained and used. Here's a good test. When you hear the word "energy" used, substitute the phrase "measurable work capability." Does the usage still make sense? Remember, energy itself is not the thing being measured: energy is the measurement of work performed or of potential... Thus, this New Age concept of the body having an "energy field" is fatally doomed. There is no such thing as an energy field; they are two unrelated concepts.
Despite the lack of scientific support, spiritual writers and thinkers have maintained ideas about energy and continue to promote them either as useful allegories or as fact. The field of energy medicine purports to manipulate energy, but there is no credible evidence to support this.
The concept of "qi" (energy) appears throughout traditional East Asian culture, such as in the art of feng shui and Chinese martial arts. Qi philosophy also includes the notion of "negative qi", typically understood as introducing negative moods like outright fear or more moderate expressions like social anxiety or awkwardness. Deflecting this negative qi through geomancy is a preoccupation in feng shui. The traditional explanation of acupuncture states that it works by manipulating the circulation of qi through a network of meridians.
Locations
There are various sacred natural sites that people of various belief systems find numinous or having an "energy" with significance to humans. The idea that some kind of "negative energy" is responsible for creating or attracting ghosts or demons appears in contemporary paranormal culture and beliefs as exemplified in the TV shows Paranormal State and Ghost Hunters.