Severe malnutrition/starvation

Page most recently updated 7 September 2026

This page focuses on the reported psychiatric associations, which may be the initial presenting manifestation, and on other clinical features that may assist the psychiatrist or primary care physician in identifying the underlying diagnosis, considered through the lenses of the diagnostic lenses framework.

Severe malnutrition/starvation is a nutritional disorder that can produce neuropsychiatric and multisystemic manifestations. A distinctive presentation may include the combination of marked weight loss, bradycardia or orthostatic hypotension, muscle wasting, and electrolyte abnormalities.

It can present with psychiatric features such as irritability, apathy, anxiety, depressive symptoms, behavioural change, impaired concentration, and cognitive impairment. Less commonly, psychotic symptoms may occur, particularly in the context of severe or prolonged starvation. Psychotic symptoms may be transient and can improve with nutritional rehabilitation.

Other characteristic features include profound fatigue and weakness, dizziness or syncope, impaired concentration, cognitive slowing, and, in severe cases, seizures or other neurological complications related to metabolic disturbances. Hypoglycemia, electrolyte abnormalities, dehydration, hypothermia, and other metabolic complications may contribute to neurological and psychiatric manifestations. Severe starvation can also result in substantial loss of muscle mass and physical frailty.

From a multisystemic lens perspective, clinical features in other body systems include (but are not limited to):

  • Cardiovascular: Bradycardia, hypotension, reduced cardiac output, orthostatic intolerance and, in severe cases, arrhythmias or cardiac failure. Marked physiological instability may occur with profound malnutrition.

  • Renal/electrolytes: Dehydration, hypokalemia, hypophosphatemia, hypomagnesemia and other electrolyte abnormalities, as well as impaired renal function in severe cases.

  • Endocrine: Hypothalamic suppression with reduced sex hormones, amenorrhea or menstrual irregularity, reduced libido, and impaired thyroid-axis activity; hypothermia, other adaptive metabolic changes, and hypoglycemia may also occur in profound starvation.

  • Hematologic: Anemia, leukopenia and, in severe or prolonged malnutrition, pancytopenia.

  • Musculoskeletal: Generalized muscle weakness, loss of muscle mass and reduced physical capacity, which may become pronounced with prolonged or severe starvation.

  • Gastrointestinal: Early satiety, bloating, constipation, abdominal discomfort and delayed gastric emptying, particularly in severe or prolonged malnutrition.

Early diagnosis is important because severe malnutrition/starvation can progress to profound metabolic, cardiovascular and neurological complications and may require urgent medical stabilization and nutritional rehabilitation. Prompt recognition also allows identification and correction of nutritional deficiencies and electrolyte abnormalities and helps reduce the risk of complications during nutritional restoration, including refeeding syndrome. Because severe malnutrition may occur in the context of eating disorders, chronic medical illness, substance use, food insecurity, gastrointestinal disease or psychiatric illness associated with food refusal, assessment should include the underlying cause as well as the severity and duration of nutritional compromise.

Selected references and further reading — Multisystemic lens

Cardinal RN, Bullmore ET. The diagnosis of psychosis. Cambridge: Cambridge University Press; 2011.

Sachdev PS, Keshavan MS, editors. Secondary schizophrenia. Cambridge: Cambridge University Press; 2010.

Levenson JL, editor. The American Psychiatric Association Publishing textbook of psychosomatic medicine and consultation-liaison psychiatry. 3rd ed. Washington (DC): American Psychiatric Association Publishing; 2019.

Stern TA, Beach SR, Smith FA, Freudenreich O, Vranceau AM, Fava M, editors. Massachusetts General Hospital handbook of general hospital psychiatry. 8th ed. Philadelphia: Elsevier; 2025.

Arciniegas DB, Yudofsky SC, Hales RE, editors. The American Psychiatric Association Publishing textbook of neuropsychiatry and clinical neurosciences. 6th ed. Washington (DC): American Psychiatric Association Publishing; 2018.

Agrawal N, Faruqui R, Bodani M, editors. Oxford textbook of neuropsychiatry. Oxford: Oxford University Press; 2020.

Boland R, Verduin M, editors. Kaplan and Sadock's comprehensive textbook of psychiatry. 11th ed. Philadelphia: Wolters Kluwer; 2024.

Loscalzo J, Fauci AS, Kasper DL, Hauser SL, Longo DL, Jameson JL, editors. Harrison's principles of internal medicine. 22nd ed. New York: McGraw Hill; 2025.