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Now, I shall talk about the 3 main classes of food first. They are carbohydrates, proteins and fats. Carbohydrates are first digested in the mouth by salivary amylase, then further digested into maltose. Then, more digestion takes place in the small intestine and the enzyme maltase digests it into the final product of glucose.

Proteins are however digested in the stomach first by the presence of pepsin. The proteins then is converted into peptones. Peptones are further digested in the small intestine by erepsin, thus leading to the final product of amino acids.

Lastly, fats are digested first in the duodenum. The duodenum is the part after the stomach. Fats are digested by bile into emulsified fats.Bile is not an enzyme however.Finally, the emulsified fats are digested in the small intestine again by lipase into fatty acids and glycerol.