If the gallbladder does not contract often enough to empty out the bile, gallstones may form. If substantial or rapid weight loss increases the risk of developing gallstones, more gradual weight loss would seem to lessen the risk of getting gallstones. However, studies are needed to test this theory. But again, no studies have directly linked a diet's nutrient composition to the risk of gallstones. Also, no studies have been conducted on the effects of repeated dieting on gallstone formation.
Gallstones are common among obese patients who lose weight rapidly after gastric bypass surgery.
Gallstones are most likely to occur within the first few months after surgery. Scientists know that weight loss increases the risk of gallstone formation. However, they don't know whether weight loss increases the risk of silent gallstones becoming symptomatic gallstones or of other complications developing. In addition to painful gallstone attacks, complications include inflammation of the gallbladder, liver, or pancreas. These are usually caused by a gallstone getting lodged in a bile duct.