Fructose metabolism in the small intestine. Fructose is efficiently metabolized by ketohexokinase (KHK) into fructose-1-phosphate (F-1-P). F-1-P is then cleaved by aldolase B (AldoB) into dihydroxyacetone phosphate (DHAP) and glyceraldehyde. Glyceraldehyde is phosphorylated by triokinase (TrioK) to provide glyceraldehyde 3-phosphate (GAP). The triose phosphates derived from fructolysis are resynthesized into glucose via gluconeogenesis or further metabolized into lactate or acetyl-CoA, which are oxidized or used for lipogenesis.