Bile does not contain digestive enzymes, why can it promote fat digestion?

Bile is a kind of digestive juice, which has the function of emulsifying fat, but there is no digestive enzyme. Bile digestion and fat absorption play an important role. Bile bile salts, cholesterol and lecithin can reduce the surface tension of fat, so fat emulsion becomes droplets, which is beneficial to fat digestion; Bile salts and fatty acid glycerol can also combine with alkali esters to form water-soluble complexes, which promote the digestion and absorption of fat. And promote the absorption of fat-soluble vitamins. The human body controls bile secretion and excretion through nerves and body fluids. The digestive glands of human body mainly include salivary gland (secreting saliva, containing salivary amylase), liver (secreting bile, but not containing digestive enzymes, but emulsifying fat and increasing the contact area between fat and digestive juice), pancreas (secreting pancreatic juice, containing various digestive enzymes), stomach gland (secreting gastric juice, containing pepsin) and intestinal gland (secreting intestinal juice, containing various digestive enzymes).