A novel dietary supplement composition that serves to inhibit FAS for the purpose of controlling body weight and body fat levels. Administration of the composition, particularly to individuals with impaired glucose tolerance, may have the effect of restoring optimal glucose functioning, therefore lessening the likelihood of adipose storage and leading to a reduction in body fat and weight. The supplement may comprise He Shou Wu, parasitic loranthus and green tea. A composition of the dietary supplement, in orally taken capsule form, may include: (a) about 500 mg of an 1:1:1 ratio extract of He Shou Wu, parasitic loranthus and green tea; (b) about 200 mg Caffeine Anhydrous; (c) about 250 mg Cinnulin PF; (d) about 100 mg Evodia Rutaecarpa; (e) about 500 mg tyrosine; and (f) about 100 mg 7-keto DHEA. The supplement may also be administered as a tablet, powdered beverage, bar, gel or drink.