Background: A common SNP upstream of the INSIG2 gene, rs7566605 (g.-10,1025G>C,Chr2:118,552,255, NT_022135.15), was reported to be associated with obesity (Body Mass Index,[BMI]) in a genome-wide association scan using the Framingham Heart Study but has not been reproduced in other cohorts. As BMI is a relatively insensitive measure of adiposity that is subject to many confounding variables, we sought to determine the relationship between the INSIG2 SNPand subcutaneous fat volumes measured by MRI in a young adult population.