Research reviewed by Gram found that about 13.1% of critically ill children, or 53 of 404 in a 2026 cohort study, developed refeeding syndrome, a sudden shift in body chemistry after feeding restarts. Children with chronic neurologic conditions faced the highest risk, and affected children stayed in the hospital longer.
According to research reviewed by Gram, about 1 in 8 critically ill children in intensive care developed refeeding syndrome, a potentially dangerous shift in body chemistry that can occur when undernourished patients begin eating again. The study, published in 2026 in Pediatric Critical Care Medicine, reviewed the records of 404 children admitted to a single pediatric intensive care unit between 2018 and 2022. Of these children, 94 were undernourished, and 53 were diagnosed with refeeding syndrome. Children with chronic neurologic conditions had higher odds of developing the syndrome, while a higher body mass index was linked to lower odds. Affected children also stayed in the hospital longer. The authors stress that close monitoring of blood chemistry during feeding is essential for these young patients.
Key Statistics
A 2026 cohort study of 404 children admitted to one pediatric intensive care unit between 2018 and 2022 found that 13.1% developed refeeding syndrome.
The same 2026 study reported that 23.3% of critically ill children admitted to the unit were classified as undernourished, with 94 of 404 meeting that classification.
Researchers analyzing 2018 to 2022 hospital records found that children with refeeding syndrome had significantly longer hospital stays than children without it.
The Quick Take
- What they studied: The researchers wanted to know how often refeeding syndrome, a sudden shift in body chemistry that can follow restarting food after a period of poor nutrition, occurs in critically ill children, and what happens to those children.
- Who participated: The study looked at 404 children aged 1 month to 18 years who were admitted to one pediatric intensive care unit at a university-affiliated hospital between January 2018 and December 2022. Of these, 94 children were classified as undernourished.
- Key finding: Refeeding syndrome was diagnosed in 53 of the 404 children, which is about 13.1%. Children with chronic neurologic conditions had greater adjusted odds of developing it, and a higher body mass index was associated with lower odds. Children who developed the syndrome stayed in the hospital significantly longer.
- What it means for you: For most readers, this study is not a direct guide to personal diet. It does show that hospital teams treating very sick, underweight children need to watch closely for chemical imbalances when feeding restarts. If you are caring for a child in the hospital, your medical team already tracks these risks, and questions about them are worth asking.
The Research Details
This was a retrospective cohort study, meaning the researchers looked back at existing hospital records rather than enrolling new patients and assigning them to treatments. The team reviewed the charts of every child admitted to one pediatric intensive care unit over a five-year period, from 2018 to 2022.
To identify refeeding syndrome, the researchers used the 2020 diagnostic guidelines from the American Society for Parenteral and Enteral Nutrition, a professional group that sets standards for nutrition care. These guidelines define the syndrome by specific changes in blood levels of minerals such as phosphate, potassium, and magnesium that occur after feeding resumes.
The researchers then compared children who developed the syndrome with those who did not. They looked at factors such as underlying health conditions, body mass index, length of hospital stay, complications, and deaths, adjusting their statistics to account for other differences between the groups.
Because the study looked at real patients over several years in a single hospital, it reflects what actually happens in everyday intensive care. A retrospective design is useful for spotting patterns and generating questions, but it cannot prove that one factor directly caused another. Its value lies in showing which children may need the most careful monitoring.
The study was published in a respected peer-reviewed journal focused on critical care medicine, and it used an established clinical definition of refeeding syndrome. Its sample of 404 children is reasonably sized for a single-center study. However, because it was conducted at one hospital and relied on existing medical records, the results may not apply equally to every pediatric intensive care unit or patient population.
What the Results Show
Roughly 23.3% of the children in the study, or 94 of 404, were classified as undernourished when they arrived in intensive care. This shows that poor nutrition is common among critically ill children, which makes careful feeding decisions important.
Refeeding syndrome was diagnosed in 53 children, or 13.1% of all those admitted. The condition occurs when the body’s chemistry shifts rapidly after feeding restarts, and it can strain the heart, muscles, and nervous system if not caught early.
The strongest signal in the data involved children with chronic neurologic conditions, such as long-term disorders affecting the brain, spinal cord, or nerves. After statistical adjustment, these children had notably greater odds of developing refeeding syndrome. In contrast, a higher body mass index was linked to lower odds, which suggests that children with more body reserves may tolerate the shift in feeding better.
Children diagnosed with refeeding syndrome had a significantly longer median hospital stay than children without it. This suggests the syndrome may add to the time needed for recovery, although the study cannot fully separate the effect of the syndrome from the effects of the underlying illness.
The findings also highlight the importance of tracking metabolic changes, which are shifts in the body’s mineral and fluid balance. Close monitoring is the main tool clinicians have for catching the syndrome early.
Refeeding syndrome has been well described in adults, especially people with severe weight loss or eating disorders, and professional guidelines recommend careful, gradual feeding for at-risk patients. This study adds information about how the condition appears in critically ill children, a group that has been studied less often. Its findings are broadly consistent with the idea that underlying illness and low body reserves increase risk.
The study was retrospective, so it depended on how thoroughly doctors and nurses recorded information in the charts. Some details may be missing or inconsistent. Because it took place at a single hospital, the results may not reflect practices or patient groups elsewhere. The study also cannot prove cause and effect, so it is not clear whether neurologic conditions directly cause refeeding syndrome or are linked to it through other factors. Finally, the study did not test any treatments to prevent the syndrome.
The Bottom Line
Research suggests that critically ill children with chronic neurologic conditions or low body mass index may need closer monitoring when feeding restarts. Confidence in this recommendation is moderate, since it comes from a single-hospital study. Existing clinical guidelines already call for careful, gradual feeding and regular checks of blood minerals in at-risk patients, and this study supports those practices rather than replacing them.
Pediatric intensive care clinicians, dietitians, and hospital teams responsible for feeding critically ill children should pay the most attention. Parents and caregivers of hospitalized children may find it useful to ask care teams about monitoring plans. The findings are less directly relevant to healthy children, adults managing everyday diets, or people who are not hospitalized.
Changes in clinical practice based on a study like this usually take months to years, as hospitals review findings, update protocols, and train staff. For an individual child, refeeding syndrome typically appears within the first few days after feeding restarts, which is why close monitoring during that window matters most.
Frequently Asked Questions
What is refeeding syndrome in critically ill children?
Refeeding syndrome is a sudden shift in body chemistry that can occur when undernourished patients begin eating again. In a 2026 study of 404 children, it was diagnosed in 53 children, or 13.1%, and can affect the heart, muscles, and nervous system if not caught early.
How common is refeeding syndrome in children in intensive care?
According to research reviewed by Gram, refeeding syndrome was diagnosed in 13.1% of children admitted to one pediatric intensive care unit between 2018 and 2022. Of the 404 children studied, 94 were undernourished when they arrived in intensive care.
Which children are at higher risk of developing refeeding syndrome?
Children with chronic neurologic conditions had greater adjusted odds of developing refeeding syndrome in the study. A higher body mass index was linked to lower odds, suggesting that children with more body reserves may tolerate the shift in feeding better.
Does refeeding syndrome make a child’s hospital stay longer?
Children who developed refeeding syndrome had a significantly longer median hospital stay than children who did not. The study cannot fully separate the effect of the syndrome from the effects of the underlying illness, so the exact contribution remains unclear.
Want to Apply This Research?
- For a caregiver supporting a child recovering from serious illness, log daily food and fluid intake in the app, along with any symptoms such as unusual weakness, swelling, irregular heartbeat, or breathing changes. Share the log with the care team and review it at each appointment.
- Use the app to set reminders for scheduled meals and to record the time each feeding begins. Keeping a clear record makes it easier for the medical team to spot patterns and respond quickly if something changes.
- Over the long term, track weight, appetite, energy levels, and recovery milestones alongside any lab results the care team shares. Review trends weekly with a healthcare provider, and treat the app as a support tool that supplements, rather than replaces, professional medical supervision.
This article summarizes a single retrospective study conducted at one hospital and is intended for general information only. It is not medical advice. Refeeding syndrome is a serious condition that requires professional diagnosis and monitoring. If a child in your care is hospitalized or recovering from illness, follow the guidance of the child’s medical team and ask them about any concerns.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.