There was a surprising case when someone survived 382 days. 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 survive longer than males. Signs and symptoms
The following are some of the symptoms of starvation:

Changes in behaviour or mental status
The beginning stages of starvation impact mental status and behaviours. These symptoms show up as irritable mood, fatigue, trouble concentrating, and preoccupation with food thoughts. People with those symptoms tend to be easily distracted and have no energy. Physical signs
As starvation progresses, the physical symptoms set in. The timing of these symptoms depends on age, size, and overall health. It usually takes days to weeks, and includes weakness, fast heart rate, shallow breaths that are slowed, thirst, and constipation. There may also be diarrhea in some cases. The eyes begin to sink in and glass over. The muscles begin to become smaller and muscle wasting sets in. One prominent sign in children is a swollen belly. Skin loosens and turns pale in color, and there may be swelling of the feet and ankles. Weakened immune system
Symptoms of starvation may also appear as a weakened immune system, slow wound healing, and poor response to infection. Rashes may develop on the skin. The body directs any nutrients available to keeping organs functioning. Other symptoms
Other effects of starvation may include:

Anemia
Gallstones
Hypotension
Stomach disease
Cardiovascular and respiratory diseases
Irregular or absent menstrual periods in women
Kidney disease or failure
Electrolyte imbalance
Emaciation
Oliguria

Stages of starvation
The symptoms of starvation show up in three stages.
Such treatment led to loss of body tissues, and when prisoners became skeletal, the so-called Muselmann were murdered by gas or bullets when examined by camp doctors. Starvation was also used as a punishment where victims were locked into a small cell until dead, a process which could take many days. Saint Maximilian Kolbe, a martyred Polish friar, underwent a sentence of starvation in Auschwitz concentration camp in 1941. Ten prisoners had been condemned to death by starvation in the wake of a successful escape from the camp. Kolbe volunteered to take the place of a man with a wife and children. After two weeks of starvation, Kolbe and three other inmates remained alive; they were then executed with injections of phenol. See also
References
Further reading

Online books, and library resources in your library and in other libraries about Starvation
U.N. Chief: Hunger Kills 17,000 Kids Daily - by CNN
Wilson, DE; Zeikus, R; Chan, IF (Apr 1987). "Relationship of organ lipoprotein lipase activity and ketonuria to hypertriglyceridemia in starved and streptozocin-induced diabetic rats". Diabetes. 36 (4): 485–90. doi:10.2337/diabetes.36.4.485. PMID 3817303. Swaner, JC; Connor, WE (Aug 1975). "Hypercholesterolemia of total starvation: its mechanism via tissue mobilization of cholesterol". The American Journal of Physiology. 229 (2): 365–9. doi:10.1152/ajplegacy.1975.229.2.365. PMID 169705.