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Transit time through the small intestine is an average of 4 hours. Half of the food residues of a meal have emptied from the small intestine by an average of 5.4 hours after ingestion. Emptying of the small intestine is complete after an average of 8.6 hours. [30]
[4] [5] Digestive enzymes are classified based on their target substrates : lipases split fatty acids into fats and oils ; [ 6 ] proteases and peptidases split proteins into small peptides and amino acids ; [ 7 ] amylases split carbohydrates such as starch and sugars into simple sugars such as glucose , [ 8 ] and nucleases split nucleic acids ...