Myths vs facts: IgG and weight loss

The claim that IgG (Immunoglobulin G) tests for food sensitivities can promote weight loss is a myth, not a fact. IgG is a normal antibody produced after eating many foods; it indicates exposure, not intolerance or allergy. Systematic reviews find no evidence that IgG-guided elimination diets lead to sustained weight loss or reduced inflammation. Any weight loss observed is likely due to the caloric restriction from avoiding many foods, not a specific IgG mechanism. Furthermore, IgG testing lacks standardized reference ranges and clinical validation. Marketing these tests for weight management is misleading. For evidence-based weight loss, focus on energy balance, protein intake, and physical activity – not unproven IgG panels.