These deficiencies can be avoided if vitamin and mineral intakes are maintained. This occurs when stomach contents move too rapidly through the small intestine. If a person troubled by dumping syndrome eats a sweet snack, he or she may become very weak and sweaty. In rare cases, he or she may lose consciousness. More than one-third of obese patients who have gastric surgery develop gallstones.
Gallstones are clumps of cholesterol and other matter that form in the gallbladder.
During rapid or substantial weight loss, a person's risk of developing gallstones increases. Gallstones can be prevented with supplemental bile salts taken for the first six months after surgery. Women of childbearing age should avoid pregnancy until their weight becomes stable. Rapid weight loss and nutrition deficiencies can harm a developing fetus.