Refueling syndrome(refeeding syndrome) is a potentially fatal metabolic disorder that occurs when an organism that is malnourished or in prolonged fasting is suddenly replenished with large amounts of carbohydrates. The main trigger mechanism is an acute decrease in blood phosphorus (hypophosphatemia), accompanied by imbalances of other essential electrolytes — potassium, magnesium and sodium — along with thiamine (vitamin B1) deficiencies.
During starvation, the body switches to ketone and lipolytic type metabolism, significantly reducing the reserves of intracellular electrolytes. When glucose is suddenly reintroduced, insulin is massively secreted, stimulating the transport of phosphorus, potassium and magnesium from the blood into the cells — which precipitates a dangerous drop in their serum levels.
Clinical manifestationsmay include:
- severe muscle weakness and paralysis
- cardiac arrhythmias and heart failure
- respiratory failure
- convulsions and coma
- Peripheral edema
Risk groupsinclude people with anorexia nervosa, hospitalized patients with severe malnutrition, those who have followed very restrictive long-term diets or long periods of unsupervised therapeutic fasting.
In the context of intermittent fasting practiced by healthy people, the risk of refueling syndrome is extremely low. It becomes relevant only in situations of prolonged fasting (over 5—7 days) or in the presence of pre-existing risk factors. Gradual reintroduction of food and medical monitoring are essential in high-risk cases.
Did you finish fasting with water? The first steps matter enormously.→ Complete guide: what you eat after fasting
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