SLC2A4 and type 2 diabetes mellitus: Moreover, the oral administration of citrus fruit peel extracts and its constituting flavonoids naringin, naringenin, hesperidin and quercetin at a dose of 100 mg/kg bw for 4 weeks significantly recovered the suppressed mRNA expressions of GLUT-4 and IRβ-subunit in the adipose tissue of nicotinamide (NA)/streptozotocin-STZ/NA-induced type 2 diabetic rats [49,50].