In the multivariate analysis adjusted by age, stunting or risk to stunting versus normal height for age, high versus normal CRP, high versus normal α1-glycoprotein, sex, and overweight/obesity versus normal body mass index, an interaction by hepcidin levels was identified in the association between H. pylori infection and iron deficiency. The gene discussed is CRP; the disease is obesity due to melanocortin 4 receptor deficiency.