What does the liver actually do?

Blood from the intestines reaches the liver first through the portal vein, so nutrients, medicines and gut-derived substances pass through liver cells before entering the rest of the circulation.

Liver cells store and release glucose, build and export fats and lipoproteins, manufacture albumin and clotting factors, produce bile that helps digest fat, and chemically modify hormones and drugs so the body can use or remove them.

Specialised immune cells inside the liver also act as part of the body's defence system.

Almost every metabolic problem — blood sugar, cholesterol, weight, blood pressure — has a liver dimension, which is why liver health is not a niche concern.

The liver has a genuine capacity to repair itself after injury, but that capacity is not unlimited: repeated or sustained injury can lead to scarring that does not simply undo itself.

The metabolic, synthetic, excretory and immune roles of the liver are long-established physiology described in standard medical references such as the MSD Manual and NIDDK patient literature.

Regeneration after partial injury or resection is well documented; it should not be read as a promise that any established liver disease can be fully reversed in any individual.