Yo-Yo Dieting Ups Men's Gallstone Risk
Men Who Lose, Then Regain Weight More Likely to Develop Gallstones, Study Shows
Nov. 27, 2006 -- Yo-yo dieting may have another unhealthy and particularly
painful side effect for men: gallstones.
A new study shows men who repeatedly lose, then regain 20 or more pounds
through dieting are up to 76% more likely to develop gallstones later in life
than men who maintain a constant weight.
Gallstones occur when a solid mass of cholesterol, bile, and calcium salts
form in the gallbladder, often causing severe pain in the stomach area and
requiring surgical treatment.
Obesity and rapid weight loss associated with dieting are known to
increase the risk of developing gallstone disease, but researchers say the
long-term effects of frequent weight fluctuation on gallstone risk in men
hasn't been clear.
Yo-Yo Dieting Linked to Gallstones
In the study, published in the Archives of Internal Medicine,
researchers analyzed data on nearly 25,000 men who participated in the Health
Professionals Follow-up Study. The men provided information on weight
fluctuations from 1988 to 1992 and were followed from 1992 to 2002 for
The results showed gallstones were more likely in men whose weight
fluctuated more than 5 pounds than those who maintained a constant weight, and
the risk of gallstones increased with the degree of weight fluctuation.
- Men whose weight fluctuated between 5 and 9 pounds per dieting attempt were
21% more likely to have gallstones.
- Men who had a weight loss of between 10 and 19 pounds had a 38% greater
- Men who lost 20 or more pounds per dieting attempt were 76% more likely to
Percentages above take into account other factors, such as age, physical
activity, alcohol intake, smoking, dietary factors, and use of certain
The risk of gallstones also increased with the number of yo-yo dieting
attempts. Men who lost and regained weight more than once had nearly double the
risk of gallstones when compared with men who maintained their weight.
Researcher Chung-Jyi Tsai, MD, ScD of the University of Kentucky Medical
Center, Lexington, and colleagues say many factors associated with yo-yo
dieting may work to raise the risk of gallstones, such as an increased
concentration of cholesterol in the bile associated with rapid weight loss.