Because IgG blood tests have not been proven to identify food sensitivities or allergies, there is a lack of evidence to support making changes based on their findings. The restrictions suggested by IgG test results may lead you to unnecessarily avoid healthy foods. Or, they may prompt individuals with food allergies to include foods that could be harmful to them.
Professional organizations that specialize in the treatment of food allergies, do not recommend IgG testing due to the lack of evidence for this use.
Susan uses the elimination and challenge method to look at any possible food intolerances.
Healing Foods 