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The amount of time a person can survive without a source of water (including food which contains water) depends on the individual and the temperature. As temperature increases, so does water loss, decreasing the amount of time a person can survive without water. The longest anyone has ever survived without water was 18 days. [8]
People in a coma often require extensive medical care to maintain their health and prevent complications such as pneumonia or blood clots. [2] Coma patients exhibit a complete absence of wakefulness and are unable to consciously feel, speak or move. [3] [4] Comas can be the result of natural causes, or can be medically induced. [5]
Without any food, humans usually die in around 2 months. [9] There was a case when someone survived over a year (382 days) under medical supervision. [10] Lean people can usually survive with a loss of up to 18% of their body mass; obese people can tolerate more, possibly over 20%. Females may survive longer than males due to their higher body ...
Mitsutaka Uchikoshi, a Japanese man, was reported by media to have survived the cold for 24 days in 2006 without food or water when he purportedly fell into a state similar to hibernation. This was doubted by some medical experts, claiming that surviving such a prolonged period without fluids was physiologically impossible.
If hypoxia results in coma, the length of unconsciousness is often indicative of long-term damage. In some cases coma can give the brain an opportunity to heal and regenerate, [34] but, in general, the longer a coma, the greater the likelihood that the person will remain in a vegetative state until death. [9]
Water intoxication can be prevented if a person's intake of water does not grossly exceed their losses. Healthy kidneys can excrete approximately 800 millilitres to one litre of fluid water (0.84–1.04 quarts) per hour. [15] However, stress (from prolonged physical exertion), as well as disease states, can greatly reduce this amount. [15]
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Person passed out on a sidewalk in New York City, 2008. In jurisprudence, unconsciousness may entitle the criminal defendant to the defense of automatism, i.e. a state without control of one's own actions, an excusing condition that allows a defendant to argue that they should not be held criminally liable for their actions or omissions.