Inedia (Latin: "fasting") is the alleged ability to live without food. The word was first used to describe a fast-based lifestyle within Catholic tradition, which holds that certain saints were able to survive for extended periods of time without food or drink other than the Eucharist.
Breatharianism is a related concept, in which believers claim food and possibly water are not necessary, and that humans can be sustained solely by prana (the vital life force in Hinduism), or, according to some, by the energy in sunlight (according to Ayurveda, sunlight is one of the main sources of prana). The terms breatharianism or inedia may also refer to this philosophy practised as a lifestyle in place of the usual diet.
The consensus of the scientific community is that "breatharianism" is potentially lethal pseudoscience, but some promote the practices of breatharianism as a skill which can be learned through specific techniques, which are generally revealed on payment of a substantial sum of money to the claimant.