Amongst other vital processes, glycans regulate our immune system. Immunoglobulin G (IgG), the most prevalent antibody type in our blood, is always glycosylated - meaning it has glycans attached to it. The type of the glycan group attached to the IgG determines if IgG will enhance or reduce inflammation in our body. Since inflammation can exhaust our resources to keep the body in good health, a low level of inflammation was shown to be a predictor of successful ageing. Therefore, IgG glycosylation is also a good measure of biological age.