(a) The digestive enzymes present in our system are: Salivary amylase, pepsin, trypsin, lipase, pancreatic amylase.
(b) Carbohydrates: It is acted upon by salivary amylase in mouth which convert complex insoluble starch into simpler
sugar. The food with carbohydrate if not digested in mouth then it is digested by amylase from pancreas to form glucose.
Fats: Bile from liver breaks the big globules of fats into smaller ones and is acted upon by lipase from pancreas which digest fats into fatty acids.
Proteins: Proteins are first digested by pepsin in stomach to form peptones. This is further digested by trypsin from pancreas to form amino acids. The enzymes present in small intestine finally convert protein to amino acids, complex carbohydrates into glucose and fats into fatty acid and glycerol.
(c) Fats and proteins containing/ rich food on digestion releases fatty acids and amino acids respectively. Hence large amount of acid is formed in the body which leads to acidity problems.