Association of Phosphate Supplements With Refeeding Oedema in Restrictive Eating Disorders

Area of Science:

• Nutritional Psychiatry
• Clinical Psychology
• Internal Medicine

Background:

• Refeeding edema, linked to insulin's effect on sodium retention, is a risk during nutritional rehabilitation for severe malnutrition.
• This edema can exacerbate body image concerns in patients with eating disorders (EDs).
• Phosphate supplementation is hypothesized to influence insulin sensitivity and potentially contribute to refeeding edema in ED patients.

Purpose of the Study:

• To investigate the impact of phosphate supplementation on weight gain rates in patients with severe malnutrition.
• To explore the relationship between phosphate supplementation and refeeding edema in patients with anorexia nervosa (AN) or avoidant restrictive food intake disorder (ARFID).

Main Methods:

• Retrospective cohort study involving 633 patients with severe malnutrition (AN or ARFID).
• Analysis of the necessity and impact of phosphate supplementation during hospitalization.
• Comparison of weight gain rates between patients who received phosphate supplements and those who did not.

Main Results:

• Phosphate supplements were required by 39% of the study cohort.
• Patients receiving phosphate supplements demonstrated significantly greater weight gain compared to the non-supplemented group (p < 0.05).
• The rate of weight gain increased in the phosphate supplement group as initial body mass index decreased.

Conclusions:

• This study provides initial evidence suggesting phosphate supplementation may contribute to refeeding edema in patients with EDs.
• Further research is needed to elucidate the precise relationship between phosphate supplementation and weight dynamics for optimized clinical care.