They are then hydrolyzed to amino acids by cellular peptidases. Fats - more complex. Digestion of fats not initiated until the small intestine. Their molecular nature is as triacylglycerides, TA's. Under the influence of CCK, gallbladder contracts and empties bile into the duodenum.
Bile salts are amphipatic and have a detergent action on fat.
Lipase can then act on the surface and hydrolyzed TA's to fatty acids and monoglycerides. These then diffuse into the absorptive epithelial cells. ER has enzymes for TA synthesis. They are reassembled into TA's and gain a apolipoprotein coat. This assembly is now called a chylomicron which moves in to the lacteals and then to plasma via the lymph.