Why obesity cause gallstones ?

Chemical imbalance : Gallstones are made of cholesterol, bile acids and bilirubin. If there is an imbalance in these, it can predispose to certain types of gallstones. Obesity can be linked to elevated cholesterol and predispose to cholesterol stones, which make up about 80% of gallstones in the us.

Cholesterol: Appears to be at the center of this issue. With obesity there is increased cholesterol synthesis and secretion. And when secreted into the hepatobiliary tract, it leads to the development of cholesterol gallstones.

Gallstones: When your are obese your body simply has more fat content and this includes increased lipids and cholesterol though your bile system. That increases the risk for gallstones.