Can IgG help with sleep?

Whether IgG antibodies can help with sleep is not well supported by scientific evidence. IgG is often measured in the context of food sensitivity testing, where elevated levels are thought to indicate delayed immune reactions. Some individuals report improved sleep after eliminating foods identified by such tests, possibly due to reduced inflammation or better gut health. However, the evidence is weak: most studies are small, uncontrolled, or fail to show a causal link. Mainstream medicine generally discourages IgG food sensitivity tests because elevated IgG may simply reflect normal exposure to common foods. Sleep disturbances have many causes (stress, hormones, sleep hygiene), and IgG testing is not a validated diagnostic tool. If you are considering an IgG test, consult a healthcare professional and do not make drastic dietary changes based solely on the results. Evidence: mixed – mechanistic plausibility exists, but robust clinical data are lacking.