Synopsis
Prevent and recognise refeeding syndrome while delivering adequate nutritional rehabilitation, distinguishing current MEED eating-disorder protocols from generic NICE CG32 starts and avoiding underfeeding.
- Refeeding reverses starvation with insulin-driven intracellular uptake of phosphate, potassium and magnesium plus sodium and water retention; thiamine demand rises as carbohydrate metabolism restarts.
- Before feeding, document reliable recent intake, trajectory, comorbidity, fluid state, ECG and baseline glucose, potassium, phosphate, magnesium, calcium, renal and liver function.
- NICE CG32 defines adult high risk using one major criterion such as BMI below 16, loss over 15%, little or no intake over 10 days or low baseline potassium, phosphate or magnesium, or two specified lesser criteria.
- CG32's generic adult nutrition pathway starts high-risk patients at no more than 10 kcal/kg/day, or 5 kcal/kg/day in extreme cases, but MEED warns that applying this indiscriminately to uncomplicated eating disorders can cause dangerous underfeeding.
- MEED advises that an adult with BMI below 13 plus acute inflammatory, electrolyte or other medical risk may start around 10 kcal/kg/day with daily increases; clinically uncomplicated patients can often start higher under close specialist monitoring.
- MEED's practical restrictive-eating-disorder table uses thiamine 50 mg orally four times daily for 7–10 days and a daily multivitamin, with intravenous vitamin B considered when oral treatment is unsuitable.
- For MEED high-risk feeding, electrolytes may need checking every 12–24 hours for the first 5 days and up to twice daily initially when baseline values are deranged; monitoring continues until stable.
- Do not combine isolated calorie numbers from different protocols: use the responsible specialist service's written SOP, match monitoring to risk and increase nutrition sufficiently to avoid ongoing weight loss.
Key red flags
MEED identifies very low weight, little or no intake for more than 4 days, abnormal baseline potassium, phosphate or magnesium, and serious medical comorbidity as high-risk features.
In adults, BMI below 13 combined with inflammatory illness, low albumin, deranged electrolytes or raised white count warrants cautious specialist refeeding in a medical setting.
New oedema, tachycardia, breathlessness, confusion, weakness or reduced oxygenation after feeding begins requires immediate biochemical and cardiorespiratory assessment.
Severely low phosphate below 0.32 mmol/L, potassium below 2.5 mmol/L or magnesium below 0.5 mmol/L features in MEED's established-syndrome framework, particularly with fluid or organ effects.
Risk is greatest in the first few days but late cases occur; premature discharge without electrolyte follow-up can miss continuing vulnerability.
Investigation priorities
Document recent intake, weight trajectory, alcohol, medicines, inflammation, organ disease and prior refeeding.
Management branches
A malnourished patient is about to restart or materially increase nutrition.
- Assess CG32 and MEED risk factors, baseline intake, fluid state, ECG and electrolytes including phosphate and magnesium.
- Agree the starting prescription, thiamine and multivitamin, replacement, monitoring frequency and escalation setting with physician and specialist dietitian.
- Explain expected symptoms and the reason for monitoring compassionately, and document capacity or lawful authority if nutrition is refused.