A person suffering from obstruction of the bile duct is advised not to eat fats and oil because

The correct answer is: "bile emulsifies fat and oil." Bile is a digestive fluid produced by the liver and stored in the gallbladder. It helps in the digestion and absorption of fats and oils in the small intestine. Bile contains bile salts which act as emulsifying agents. Emulsification is the process by which large fat globules are broken down into smaller droplets, making it easier for enzymes to break down the fats and for them to be absorbed into the bloodstream. When the bile duct is obstructed, bile cannot flow into the small intestine, leading to a decrease in the amount of bile available for digestion. As a result, the digestion and absorption of fats and oils become compromised, leading to symptoms such as abdominal pain, bloating, and diarrhea. Therefore, people with bile duct obstruction are advised to avoid consuming fats and oils to prevent worsening of their symptoms.