Serum FABP4 levels positively correlated to FLI in the whole population (ρ = 0.387, P < 0.001), diabetic (ρ = 0.444, P < 0.001), obese (ρ = 0.392, P < 0.001), and metabolic syndrome (ρ = 0.300, P < 0.001) patients. This evidence concerns the gene FABP4 and metabolic syndrome.