The function of bile is to:

Bile primarily functions to emulsify fats, which is crucial for the digestion and absorption of dietary fats. When you eat foods that contain fat, bile, produced by the liver and stored in the gallbladder, is released into the small intestine. The bile contains bile salts that break down large fat globules into smaller droplets, increasing the surface area for the action of digestive enzymes, particularly lipases. This emulsification process is vital because it allows for more efficient digestion and absorption of fats and fat-soluble vitamins (A, D, E, and K).

Absorbing nutrients is not a function of bile itself; rather, this occurs in the intestines after bile has done its job of emulsifying fats. Similarly, bile does not play a role in storing glucose or regulating blood sugar levels; these processes are managed by other organs, primarily the liver and pancreas. Thus, the primary function of bile as an emulsifying agent makes it essential for fat digestion in the digestive system.