Where your DNA places you among other people, and the studies behind it.
Not tailored to your result, and not medical advice
Reduce Excess Abdominal Weight: Fat around the abdomen raises pressure inside the abdominal cavity and increases how often the valve between stomach and esophagus relaxes when it should stay shut. One study counted 17.3 of these transient relaxations per hour after a meal in obese participants against 2.1 in participants of normal weight, and in a series of 345 morbidly obese patients with reflux symptoms about half also had a hiatal hernia. Among 332 obese adults in a structured weight loss program, a mean loss of 13 kg cut GERD prevalence from 37 percent to 15 percent, with 81 percent reporting lower symptom scores. The evidence is not unanimous: a very low calorie diet group lost an average of 10.8 kg without a significant change in reflux symptoms. Gastroenterology Clinics of North America (PMC)
Finish Eating Well Before Bed: Reflux worsens lying down because gravity no longer helps clear acid from the esophagus. In a randomized crossover trial, people who ate a fatty evening meal two hours before bed spent significantly more of the night with esophageal pH below 4 than when they ate the same meal six hours before bed, and a case-control study put the odds of reflux disease 7.45 times higher (95% CI 3.38 to 16.4) in people who habitually ate within three hours of sleeping. Sleeping with the head end of the bed raised is associated with fewer reflux episodes and faster acid clearance. Lying on the left side improves overnight esophageal pH and acid clearance compared with lying on the right. Therapeutic Advances in Chronic Disease (PMC)
Quit or Avoid Smoking: Smoking lowers the resting pressure of the muscular valve at the bottom of the esophagus, and that pressure returns to normal within minutes of finishing a cigarette. In the HUNT cohort of 29,610 Norwegian adults followed for roughly 11 years, people with severe reflux who stopped smoking daily were more likely to improve to no or minor complaints than those who kept smoking (adjusted OR 1.78, 95% CI 1.07 to 2.97), with a stronger association among those of normal weight (OR 5.67, 95% CI 1.36 to 23.64). That result came only from the subgroup whose symptoms were severe enough to be treated at least weekly, and the study found no association among people with minor reflux, so the measurable benefit sat at the worst end rather than spread across everyone. American Journal of Gastroenterology (PubMed)
Test Your Own Food Triggers: Long lists of foods to cut out are standard reflux advice, but the trial evidence behind them is thin. A systematic review that screened 2,039 studies and found only 16 usable clinical trials concluded that weight loss and head of bed elevation were the two measures with supporting evidence, and that no published evidence showed reflux measures improving after dietary avoidance, even though chocolate, high fat meals, alcohol and tobacco do measurably lower sphincter pressure in laboratory testing. Noting which foods reliably set off your own symptoms is more informative than eliminating everything on a generic list. Symptoms that persist, trouble swallowing, or weight loss you did not intend are worth raising with a clinician. Archives of Internal Medicine (PubMed)
Stack the Changes Together: Individual habits look modest alone and add up when combined. Among 42,955 women in the Nurses' Health Study II followed from 2005 to 2017, with 9,291 new cases of weekly reflux symptoms, five factors were assessed jointly: normal weight, never smoking, at least 30 minutes a day of moderate to vigorous activity, no more than two cups of coffee, tea or soda a day, and a prudent dietary pattern scored on vegetables, fruit, whole grains, legumes and fish. Women meeting all five had about half the risk of women meeting none (hazard ratio 0.50, 95% CI 0.42 to 0.59), and the authors estimated 37 percent of symptom cases (95% CI 28 to 46) were attributable to not meeting them. This is observational data, so it shows association rather than proof of cause. JAMA Internal Medicine (PMC)
How much of this is genetic?
Genetics explains 31% of why people differ in this trait. The rest is environment, daily habits and chance.
Heritability estimate: Twin studies place GERD heritability at roughly 31-43% of the variation in liability. Cameron et al. (Gastroenterology, 2002) estimated 31% (95% CI 23-39%) in the Swedish Twin Registry; Mohammed et al. (Gut, 2003) reported ~43% (95% CI 32-55%). The lower, more conservative estimate is shown here.
Background and further reading
Gastro-esophageal reflux disease (GERD) is a common chronic condition in which stomach contents flow back up into the esophagus frequently enough to cause troublesome symptoms or complications. The hallmark symptoms are heartburn (a burning sensation behind the breastbone) and acid regurgitation, though some people experience chest discomfort, a chronic cough, hoarseness, or difficulty swallowing. Population surveys estimate that GERD affects roughly 13-20% of adults in Western countries, and prevalence has been rising over recent decades. Occasional reflux is normal, but GERD is defined by symptoms that are frequent, persistent, or bothersome. Over time, repeated acid exposure can inflame the esophageal lining (esophagitis) and, in a minority of people, lead to complications such as Barrett's esophagus.
Genetic Basis: Twin and family studies estimate that genetic factors account for roughly 31-43% of the variation in GERD liability, with the remainder driven by environment and lifestyle. GERD is highly polygenic, meaning many common variants each contribute a small amount to overall predisposition. Large genome-wide association studies have identified dozens of associated loci, and many of them overlap with genes influencing body weight and fat distribution, obesity being one of the strongest risk factors for reflux. Signals near obesity-related genes such as FTO and MC4R, along with loci implicated in esophageal and gastric tissue biology, point to shared genetics between reflux, metabolic traits, and the neuromuscular control of the lower esophageal sphincter and diaphragm.
Environmental Factors: Lifestyle and environmental factors have a strong influence on whether reflux symptoms develop and how severe they are. Excess body weight, especially around the abdomen, raises pressure on the stomach and is one of the most consistent modifiable risk factors. Smoking, alcohol, large or late-evening meals, and certain foods (such as fatty or fried foods, caffeine, chocolate, and acidic or spicy items) can trigger or worsen symptoms in many people. Pregnancy, hiatal hernia, and some medications also promote reflux. Because triggers vary widely between individuals, tracking personal patterns is often more useful than following generic food lists.
The published research behind your score, and the variants it draws on.
4 published scores from 2 studies
The GERD score combines 4 polygenic scores drawn from 2 published studies.
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Content updated August 2026.
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