They support the proper digestion of proteins, fats, carbohydrates, fiber, and even milk sugar, i.e. lactose. They include proteases (they degrade peptide bonds in proteins); amylases (they degrade glycosidic bonds in carbohydrates); lipases (responsible for the hydrolysis of ester bonds in fats); cellulase (allows the hydrolysis of cellulose that builds plant fibers) and lactase (breaks down lactose into easily digestible glucose and galactose).
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