Adiponectin in anorexia nervosa and its modifiers: A meta-regression study

Area of Science:

• Endocrinology
• Metabolic Syndrome
• Nutritional Psychiatry

Background:

• Adiponectin, a protein hormone from adipose tissue, is implicated in metabolic regulation.
• Previous studies indicate elevated adiponectin in anorexia nervosa (AN) and caloric restriction.
• The specific impact of AN subtypes and adiponectin modifiers in AN remains unclear.

Purpose of the Study:

• To conduct a meta-analysis on adiponectin levels in anorexia nervosa.
• To investigate adiponectin levels across different AN subtypes.
• To identify metabolic modifiers of adiponectin in AN.

Main Methods:

• Systematic literature search up to January 2021 for studies comparing adiponectin in AN cases and controls.
• Meta-analysis using a random-effects model to calculate pooled standardized mean difference (SMD).
• Meta-regression analysis to assess modifiers of adiponectin levels.

Main Results:

• Thirty-four studies were included, demonstrating significantly higher adiponectin levels in AN participants compared to controls (Hedges' g = 0.765, p < .0001).
• Elevated adiponectin was observed in both binge-eating/purging (Hedges' g = 1.211, p < .00001) and restrictive AN subtypes (Hedges' g = 0.913, p < .00001).
• Insulin, IGF-1, BMI, triglyceride, resistin, glucose, and IL-6 levels were identified as significant modifiers of adiponectin in AN.

Conclusions:

• Adiponectin levels are consistently higher in anorexia nervosa, irrespective of subtype.
• Metabolic parameters and pro-inflammatory markers significantly modulate the relationship between AN and adiponectin.
• Adipose tissue plays a crucial role in maintaining metabolic stability within the context of AN.