What role does IgG play in weight loss?

The role of IgG (immunoglobulin G) in weight loss is not well established by scientific evidence. IgG antibodies are part of the adaptive immune system and are often linked to food sensitivities. Some commercial providers market IgG tests as a tool for weight reduction, claiming they identify 'delayed' food intolerances that cause inflammation and weight gain. However, the evidence is weak: studies show no consistent correlation between IgG reactions and body weight or metabolic markers. Moreover, IgG levels can fluctuate with normal food intake without indicating pathology. From a nutritional medicine perspective, a balanced, calorie-controlled diet focusing on whole foods remains the gold standard for weight management – not IgG testing. Professional societies like the European Academy of Allergy and Clinical Immunology do not recommend IgG-based elimination diets for weight loss. If you are considering an IgG-based diet, approach it critically and consult a healthcare professional.