What to watch with IgG and weight loss?

IgG food antibody tests are often marketed for weight loss, but the scientific evidence is weak. Elevated IgG levels typically reflect normal immune exposure, not true intolerance or allergy. Elimination diets based on such tests may lead to short-term weight loss, likely due to removing entire food groups and reducing calorie intake. However, long-term evidence for sustained weight loss is lacking, and there is a risk of unnecessary dietary restrictions and nutrient deficiencies. For evidence-based weight management, focus on total calorie balance, macronutrient quality, and sustainable lifestyle changes. IgG testing is not a validated tool for weight loss and should not replace professional dietary guidance.