Reducing agent used in lipogenesis is derived from
Pentose phosphate pathway
Glycolysis
TCA cycle
Gluconeogenesis
NADPH is involved as donor of reducing equivalents in both the reduction of the 3-ketoacyl and of the 2, 3-unsaturated acyl derivatives. The oxidative reactions of the pentose phosphate are the chief source of the hydrogen required for the reductive synthesis of fatty acids.