We then checked whether younger and older individuals with obesity differ by their BIH to A/H1N1 antigens, since both obese individuals and adults were enriched in the low-IgG-BIH groups for whole A/H1N1 viruses and in the high-IgG-BIH groups for H1 and N1 peptides, as well as in the low-IgA-BIH groups for H1 proteins (Fig. 4). This evidence concerns the gene CD79A and obesity due to melanocortin 4 receptor deficiency.