Where your DNA places you among other people, and the studies behind it.
Not tailored to your result, and not medical advice
Lose Weight Gradually, Not Rapidly: How fast weight comes off matters independently of how much comes off. In a one-year matched cohort from a commercial weight loss program, people on a 500 kcal per day very low calorie diet developed symptomatic gallstones at 152 per 10,000 person-years against 44 per 10,000 for those eating 1,200 to 1,500 kcal per day, a hazard ratio of 3.4, with gallbladder removal about three times more common as well. Over that year it works out to roughly one extra case of symptomatic stones for every 92 people. Fast fat mobilisation loads bile with cholesterol while the gallbladder empties less often, and the excess risk was reduced but still present after accounting for how much weight people lost in the first three months. International Journal of Obesity (PMC)
Keep Up Regular Physical Activity: A meta-analysis of 16 studies covering roughly 260,000 people found that among the cohort studies gallstone disease was 15% less common in the most active groups than in the least active, with risk about 13% lower per 20 MET-hours of recreational activity a week, which is around five hours of brisk walking. Proposed mechanisms are stronger gallbladder contraction and more frequent emptying, better insulin sensitivity, and less cholesterol secreted into bile, though the exact pathway is not settled. The association was graded rather than all-or-nothing, and national guidance of 150 minutes of moderate activity a week sits at about half the level studied. These are observational cohorts, so activity may partly stand in for other healthy habits. Journal of Clinical Gastroenterology (PubMed)
Do Not Delay Your First Meal: The gallbladder empties mainly in response to food, so long stretches without eating leave bile sitting and becoming more concentrated. In NHANES data on 6,547 US adults, each hour later that people ate the first meal of the day was associated with 5% higher odds of gallstones, and those whose first meal fell between 09:00 and 14:00 had about 49% higher odds than earlier eaters. The study is cross-sectional, so it cannot establish cause or direction. It does fit the long-standing clinical observation that gallbladder sludge and stones tend to form during prolonged fasting. Frontiers in Nutrition (PubMed)
Keep Your Coffee Habit: A meta-analysis of six studies covering 227,749 people and 11,477 gallstone cases found a graded association with coffee. Compared with the lowest intake, risk was 11% lower at 2 cups a day, 19% lower at 4 cups and 25% lower at 6 cups. The mechanism is not established and the underlying studies are observational, so this is better read as reassurance about an existing habit than a reason to start drinking coffee. Alimentary Pharmacology & Therapeutics (PubMed)
Know Which Symptoms Need Attention: Gallstones are common and mostly quiet. NIDDK states that most people with gallstones do not have symptoms, and stones that cause no symptoms are usually left alone. Nothing in diet or exercise dissolves stones that have already formed, so the habits above are about lowering the chance of forming them rather than clearing them, and that is an honest limit on what lifestyle can do here. NIDDK lists abdominal pain lasting several hours, nausea and vomiting, fever or chills, yellowing of the skin or the whites of the eyes, and tea-colored urine with light-colored stools as reasons to seek care right away, and any of those is worth a conversation with a clinician. NIDDK (NIH)
How much of this is genetic?
Genetics explains 25% of why people differ in this trait. The rest is environment, daily habits and chance.
Heritability estimate: Katsika et al. 2005, Hepatology
Background and further reading
Gallstones (cholelithiasis) are solid deposits that form in the gallbladder, the small organ that stores bile produced by the liver. The great majority are cholesterol stones, which form when bile becomes supersaturated with cholesterol; a minority are pigment stones rich in bilirubin. Gallstones are very common, affecting roughly 10-15% of adults in Western populations, and become more frequent with age. Many people never have symptoms, but stones that obstruct a bile duct can cause biliary colic (severe pain in the upper-right abdomen), and complications such as inflammation of the gallbladder (cholecystitis), pancreatitis, or bile-duct infection.
Genetic Basis: Twin and family studies indicate that inherited factors account for roughly a quarter of the liability to symptomatic gallstone disease, with shared and unique environment explaining the remainder. The single strongest common genetic risk factor is a variant in the hepatic cholesterol transporter gene ABCG8 (the p.D19H substitution, rs11887534), which increases secretion of cholesterol into bile and can substantially raise the odds of gallstones in carriers. Related loci in the ABCG5/ABCG8 sterol-transporter region, together with genes involved in bile-acid and bilirubin handling such as CYP7A1, UGT1A1, SULT2A1, and TM4SF4, and rarer high-impact variants in ABCB4, contribute to the polygenic architecture of the trait.
Environmental Factors: Gallstone risk is heavily shaped by modifiable and demographic factors, often summarized as the classic 'five Fs': female sex, being over forty, fertility (pregnancy and higher lifetime estrogen exposure), higher body weight, and fair northern-European or Indigenous American ancestry. Obesity, rapid weight loss (including after bariatric surgery), diabetes, high-fat or high-refined-carbohydrate diets, and physical inactivity all raise risk, whereas regular physical activity, a fiber-rich diet, healthy body weight, and moderate coffee intake are associated with lower risk. Because environment contributes the larger share of overall liability, lifestyle has a meaningful influence regardless of genetic score.
The published research behind your score, and the variants it draws on.
7 published scores from 4 studies
The gallstones score combines 7 polygenic scores drawn from 4 published studies.
Lammert F, Gurusamy K, Ko CW, et al. Gallstones. Nature Reviews Disease Primers (2016)
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Content updated August 2026.
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