Clinical Guides
Eating Disorders: Anorexia Nervosa and Bulimia Nervosa
An India-adapted, review-only guide to early recognition, medical stabilisation, specialist referral and compassionate care for anorexia nervosa and bulimia nervosa.
MedNext Academy | 12 min read
Eating Disorders: Anorexia Nervosa and Bulimia Nervosa
An India-adapted, review-only guide to early recognition, medical stabilisation, specialist referral and compassionate care for anorexia nervosa and bulimia nervosa.
Summary
Anorexia nervosa and bulimia nervosa are serious mental-health conditions with nutritional, cardiac, endocrine, gastrointestinal, dental and suicide-related risks. Anorexia nervosa involves restrictive intake and low weight or failure to gain expected weight with intense fear of weight gain or disturbed body experience. Bulimia nervosa involves recurrent binge eating with compensatory behaviours such as self-induced vomiting, fasting, misuse of laxatives or excessive exercise. Neither condition is defined by appearance, gender, one body-mass index value or a lack of willpower. The first task is to recognise medical instability and safeguarding needs, then connect the person to age-appropriate multidisciplinary care. A person can be severely unwell despite a weight that is not visibly low, especially after rapid loss, persistent purging or insulin manipulation. Avoid praise for weight loss, moralising about food, or advice that inadvertently strengthens restriction or purging. This is an educational review draft, not an individual nutrition or prescribing plan. [ED-1]
How Common Is It?
Eating disorders can affect people of all genders, ages, body sizes, cultural backgrounds and income groups. They are often missed because shame, secrecy, normal-weight presentation, stigma and limited specialist access delay disclosure. Hospital or survey figures are not interchangeable with local clinical burden, and they must not be used to exclude a person who has serious symptoms. Presentations may be to general medicine, dentistry, gynaecology, paediatrics, sports medicine, diabetes clinics or emergency services rather than psychiatry. A useful clinical question is whether eating, weight or shape concerns are driving restriction, bingeing, purging or unsafe exercise and causing impairment or physiological harm. current guidelines, a United Kingdom comparator rather than an Indian legal or formulary standard, notes that early assessment and treatment are important, particularly where severe emaciation is present. India-specific epidemiological and disorder-specific service guidance remains limited, so local referral capacity must be confirmed. A delayed disclosure does not indicate mild illness: it can reflect fear of stigma, family conflict, financial barriers or a belief that the person is not thin enough to deserve care. [ED-1]
Risk Factors
Risk is multifactorial. Dieting, rapid weight change, body dissatisfaction, perfectionism, anxiety, depression, obsessive-compulsive traits, trauma, bullying, chronic illness affecting diet, family conflict and weight-focused sport or work can contribute. Social media exposure may intensify comparison but does not alone explain illness. Ask about restrictive rules, feared foods, binge episodes, vomiting, laxatives, diuretics, diet pills, insulin manipulation, supplements, compulsive exercise, menstrual or pubertal change, constipation, dizziness, fainting, palpitations and dental symptoms. Explore self-harm, suicide, alcohol or drug use, sexual safety and coercion. Children and adolescents may show faltering growth, delayed puberty, school withdrawal or family conflict rather than openly describe body-image concerns. A person with a larger body can have severe restriction or purging and needs the same careful assessment. Do not calculate a risk score from a single BMI or accept a family reassurance that the behaviour is merely a phase. [ED-1]
Diagnosis
History
Use non-judgmental questions about a typical day of eating, bingeing, purging, fasting, exercise, weight trajectory, body image, menstrual history, medicines, diabetes and substance use. Establish duration, loss of control, compensatory behaviours, medical symptoms, mood, self-harm, family context and capacity to accept care. Ask separately about diuretics, laxatives, diet products, supplements and insulin omission because people may not regard these as purging. ### Examination Measure weight and height sensitively, review change over time, observations, hydration, temperature, postural symptoms, oral health, skin, muscle strength, oedema and signs of injury. Explain each step and offer privacy. Mental-state examination includes depression, obsessionality, psychosis, cognition and suicide risk. ### Investigations Investigations are for safety: glucose, electrolytes, renal and liver function, magnesium, phosphate, blood count, ECG and pregnancy testing as clinically indicated. Tests may be normal despite dangerous illness; results must not overrule history, examination or rapid deterioration. [ED-1]
Differential Diagnosis
Consider medical causes of weight loss or vomiting, including gastrointestinal disease, endocrine disorders, malignancy, infection, diabetes, pregnancy, medication effects and substance use. Depression may reduce appetite but does not necessarily explain fear of weight gain or compensatory behaviour. Obsessive-compulsive disorder, body dysmorphic disorder, psychosis, autism-related feeding difficulties, avoidant/restrictive food intake disorder and trauma-related symptoms may overlap but require distinct formulations. In bulimia-like symptoms, distinguish recurrent binge eating with compensatory behaviours from binge-eating disorder without regular compensation. Do not assume vomiting is volitional: investigate raised intracranial pressure, gastrointestinal obstruction, metabolic illness and pregnancy where relevant. In children, growth history and developmental context matter. A diagnosis of anorexia or bulimia can coexist with diabetes, depression or substance use; treating one should not postpone management of the others. If an individual is medically unstable, diagnostic refinement must not delay urgent treatment. Similarly, diabetic ketoacidosis, severe infection and drug toxicity should not be mistaken for an eating-disorder complication simply because the history contains restriction. [ED-1]
Management
Medical stabilisation comes first where dehydration, electrolyte disturbance, hypoglycaemia, arrhythmia risk, syncope, severe malnutrition or organ compromise is suspected. Involve medicine, paediatrics, psychiatry, dietetics and nursing according to age and setting. Nutrition restoration requires a monitored plan; in a severely malnourished person, refeeding can carry metabolic risk and should be managed by an experienced team. Monitoring must include symptoms and clinical observations as well as laboratory tests, because a single reassuring result does not establish safety. For ongoing care, provide disorder-focused psychological treatment with regular physical and mental-health monitoring. Family-based approaches are important options for children and adolescents; adults may need structured individual therapy. Discuss meals and weight in neutral, collaborative language and agree how information will be shared with family. Treat self-harm, depression, anxiety, substance use and dental complications without making recovery conditional on perfect adherence. Relapse planning identifies early warning signs, crisis contacts and return-to-care steps. Never offer generic weight-loss programmes, unsupervised dieting advice or exercise targets to a person with active restriction or purging. [ED-1]
Prescribing Information
No medicine should be presented as a sole treatment for anorexia nervosa or bulimia nervosa. Medicines may have a role for coexisting depression, anxiety, obsessive symptoms or other conditions after a clinician evaluates nutritional state, cardiac risk, electrolytes, interactions, pregnancy potential and overdose risk. Purging, dehydration, bradycardia and electrolyte disturbance can substantially change medication safety. Avoid casual prescriptions for appetite, sleep, constipation, nausea or anxiety that mask deterioration or worsen arrhythmia, sedation or misuse. Laxatives and diuretics are not weight-loss treatments and can cause serious harm; advise assessment rather than abrupt self-directed changes when misuse is established. Any electrolyte replacement, nutritional supplement or psychotropic drug should follow local protocol and be monitored by the responsible team. Medicines prescribed for another illness should also be reviewed if intake has changed, vomiting is frequent or a new ECG concern emerges. The current guidelines comparator guideline specifically advises against medication as the sole treatment for either anorexia nervosa or bulimia nervosa. This draft intentionally gives no dose or caloric prescription. [ED-1]
When to Refer
Refer urgently to an emergency department or acute medical team for syncope, chest pain, palpitations, seizures, confusion, severe weakness, dehydration, persistent vomiting, gastrointestinal bleeding, severe electrolyte abnormality, hypoglycaemia, marked bradycardia or hypotension, acute kidney injury, severe malnutrition or suspected organ failure. Urgent psychiatric assessment is needed for suicidal intent, self-harm, psychosis, inability to maintain safety or severe refusal of essential care. Refer suspected anorexia or bulimia promptly to an age-appropriate specialist eating-disorder or mental-health service, ideally with dietetic and medical input. Adolescents need paediatric, child and adolescent mental-health and safeguarding pathways. In Indian settings where a named eating-disorder service is unavailable, arrange the closest realistic coordinated route: emergency or medical admission for instability, district or medical-college psychiatry for assessment, and nutrition support integrated with medical monitoring. A referral should state the direction and speed of weight change, frequency of vomiting or other compensatory behaviour, current intake, observations and whether the person can attend safely. Send trend data, vital signs, risks, medicines, laboratory results and safeguarding concerns, not simply a diagnostic label. [ED-2]
Red Flags
Red flags are physiological as well as psychiatric. Emergency assessment is required for fainting, collapse, chest pain, breathlessness, severe weakness, confusion, seizure, dehydration, repeated vomiting, haematemesis, severe abdominal pain, inability to keep fluids down, hypoglycaemia, significant electrolyte disturbance, arrhythmia symptoms, marked postural symptoms or evidence of organ failure. Rapid weight loss can be dangerous even when current BMI is not low. Escalate for suicidal intent, recent self-harm, dangerous substance use, domestic abuse, exploitation, inability to care for a child or a young person at risk. Do not offer a waiting-list-only response to a person with medical instability. Do not weigh or discuss body measurements publicly, and do not use threats or humiliation to obtain adherence. A refusal of food may reflect severe illness, fear, sensory distress, coercion or impaired capacity; assess respectfully, seek senior input and follow legal safeguards. An apparently cooperative patient can deteriorate quickly after discharge if vomiting, purging or intake restriction continues; give explicit return precautions and a named review arrangement. Document the clinical facts, capacity assessment, family discussion, plan and handover. [ED-1]
Indian Clinical Context
India-specific eating-disorder pathways are uneven, so clinicians should not promise a specialist service that does not exist locally. Coordinate the available medical, psychiatric, paediatric, gynaecology, dental and dietetic supports, and clarify who will monitor observations, electrolytes, ECG and follow-up. The Mental Healthcare Act, 2017 provides a rights-based framework for mental-health care. Distress, low weight or family disagreement does not automatically prove incapacity; assess capacity for the specific decision and use the least restrictive safe option with senior legal and clinical advice when coercive care is contemplated. Confidentiality is important for adolescents and adults, but safeguarding duties apply when a child or vulnerable person is at risk. For suicide attempts, section 115 presumes severe stress and requires care, treatment and rehabilitation. Language matters: use the person’s own words and avoid calling the disorder vanity, stubbornness or a lifestyle choice. current guidelines is a United Kingdom comparator, so its pathway recommendations do not prove local service availability or replace Indian legal, referral and formulary rules. Confirm local emergency contacts and referral routes before discharge. [ED-2]
NMC Competency Mapping
NMC CBME 2024 supports integrated learning across psychiatry, medicine, paediatrics, nutrition, communication and professionalism. Learners should recognise that eating disorders can occur without an obviously low body weight, take a sensitive diet and purge history, measure observations respectfully, identify medical instability and communicate a clear escalation plan. At Know and Know How levels, distinguish anorexia nervosa, bulimia nervosa, binge-eating disorder and medical mimics; explain why electrolyte and ECG assessment may be necessary; and identify suicide and safeguarding risk. At Show How level, demonstrate a non-stigmatising interview, a structured handover and a discussion with a parent or carer that preserves the young person’s dignity. Learners must not independently prescribe refeeding, electrolyte replacement or psychotropic medication. Competence includes recognising uncertainty, involving a multidisciplinary team and documenting consent, capacity and urgent referral. A learner should escalate a change in observations or intake even when the patient appears calm, rather than waiting for a diagnostic label to become certain. [ED-3]
Key Exam Pearls for NEET PG
Do not rule out an eating disorder because BMI is normal or because the patient is male. Anorexia nervosa involves restrictive intake with fear of weight gain or disturbed body experience; bulimia nervosa involves recurrent binge eating with compensatory behaviours. Purging can cause electrolyte disturbance and arrhythmia risk; urgent assessment is based on the whole clinical picture, not a single number. A patient with severe malnutrition needs carefully monitored nutritional restoration because refeeding can be hazardous. Medication alone is not adequate treatment for anorexia or bulimia. In a vignette with syncope, bradycardia, hypotension, hypoglycaemia, severe dehydration, abnormal ECG or suicidality, choose emergency medical and specialist assessment rather than outpatient diet advice. For adolescents, family involvement can be therapeutic but should never be blaming. A normal-looking examination or normal initial laboratory result does not cancel concern when intake is falling or purging is frequent. The safe answer integrates medical stabilisation, disorder-focused therapy and continuing monitoring. [ED-1]
Frequently Asked Questions
Can someone have anorexia nervosa or bulimia nervosa at a normal or high body weight?
Yes. Weight alone cannot establish or exclude an eating disorder. Rapid weight loss, restriction, bingeing, purging, dizziness, fainting, distress about shape and loss of function all deserve assessment regardless of current size. Clinicians should focus on the person’s trajectory, behaviours, physical signs and mental-health risk. A normal laboratory result or a normal-range BMI does not prove medical safety. This matters particularly when a patient has received compliments for weight loss, is a boy or man, has diabetes, plays competitive sport, or does not describe their behaviour as an eating disorder. Ask about changes from their own expected growth or weight pattern, the amount of time spent thinking about food or shape, and whether school, work, social eating or relationships are being avoided. Discuss weighing and body measurements before doing them; unexpected public or repeated weighing can be distressing. Share results neutrally and explain what will be monitored. A person may not be ready to name the problem, but can still accept help for dizziness, menstrual change, vomiting, constipation, anxiety or sleep. Referral can be based on concern and risk, not diagnostic certainty.
Why can an eating disorder become a medical emergency?
Restriction, vomiting, laxative or diuretic misuse, dehydration and rapid weight change can affect glucose, electrolytes, blood pressure, heart rhythm, kidneys and brain function. Collapse, chest pain, palpitations, confusion, severe weakness, repeated vomiting or inability to drink safely require urgent medical care. Medical risk and suicide risk can coexist, so emergency teams need both physical and mental-health assessment. In hospital, clinicians may repeat observations, check posture, take an ECG and order blood tests while also assessing the amount and timing of recent intake, purging, fluids, medicines and exercise. A reassuring appearance does not cancel concern; arrhythmia, electrolyte abnormalities and hypoglycaemia can be dangerous before someone looks critically unwell. Conversely, results are interpreted in context and are not a reason to discharge someone with ongoing rapid decline. If nutritional restoration is needed after marked malnutrition, it must be planned and monitored because metabolic changes can occur during refeeding. Family should bring a medicines list and relevant history, but should not give electrolyte products, laxatives, diuretics, diet pills or sedatives without clinical direction.
Is medication enough to treat anorexia nervosa or bulimia nervosa?
No. Medication may help a coexisting condition in selected people, but it is not a replacement for nutritional rehabilitation, regular medical monitoring and disorder-focused psychological treatment. Prescribing is more complex when there is malnutrition, purging, bradycardia, electrolyte disturbance, pregnancy potential, overdose risk or substance use. The responsible clinician should decide treatment using current local protocols. A useful conversation explains what each treatment is intended to address: medical monitoring protects the body, nutritional work restores regular adequate intake, therapy addresses the patterns that maintain the disorder, and medicines may help a clearly diagnosed coexisting condition. Improvement can take time and temporary distress around meals does not prove that treatment is wrong. Avoid borrowing prescriptions, using over-the-counter weight-loss products or changing laxative, diuretic or insulin use alone. Tell the clinician about herbal products, supplements, caffeine-heavy products and sports preparations. If side effects, increased suicidal thoughts, palpitations, vomiting or inability to eat occur, seek prompt review rather than abruptly stopping all care.
How should a family support someone with an eating disorder safely?
Families can help by using calm, non-blaming language, supporting attendance and agreed meal plans, watching for deterioration and sharing factual safety information with clinicians. Avoid policing food, commenting on body shape, promising secrecy about immediate danger or giving unsupervised supplements and medicines. If there is collapse, chest pain, confusion, suicidal intent, severe vomiting or inability to drink, seek emergency care rather than attempting to manage the crisis at home. Carers can ask the person what wording, times and practical support feel least distressing, and can request separate advice for themselves if permitted. It helps to avoid debates about whether the person looks ill enough, calorie counting in public, threats, bribes and comparisons with siblings or peers. Instead, describe observable facts: meals missed, vomiting, dizziness, fainting, exercise, medicines, self-harm statements and missed appointments. If a young person is involved, clinicians may need information from both the young person and carers while explaining confidentiality and safeguarding limits. Recovery often includes setbacks; re-engagement with the treatment team is safer than punishment or withdrawal of support. Arrange home routines around professional guidance rather than negotiating a new diet each day. Keep appointments even after conflict, and take a list of questions about school, sport, travel, pregnancy or medicines. Explain to siblings that the illness needs care without making them monitors. Carers should seek support for their own stress, because fear and exhaustion can make conversations more reactive. Immediate risk always overrides ordinary privacy: tell clinicians about collapse, suicidality or dangerous purging even if the person asks you not to.
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