Meal timing becomes a question for the liver

# Meal timing becomes a question for the liver OCTOBER 15, 2026 | LONGEVITY SPECIAL People who reported eating late at night had 20% to 30% higher rates of liver disease than people who did not, according to News-Medical's report of a new study from Oregon Health & Science University (OHSU). When people eat is part of the pattern of their lives. An association between late-night eating and liver disease makes that timing worth investigating, without yet showing that changing it improves health. This article is based on that report. The study paper itself was not reviewed. According to News-Medical, the researchers define late-night eating as eating after dinner or after bedtime. They looked at two liver conditions: metabolic dysfunction-associated steatotic liver disease (MASLD), which is the newer name for fatty liver disease, and cirrhosis, which is severe scarring of the liver. News-Medical reports that the team analyzed three large, existing U.S. datasets: the Nurses' Health Study, the Nurses' Health Study II and the Health Professionals Follow-up Study. Almost 200,000 participants had reported their diet and lifestyle habits. The researchers grouped people by eating behavior and looked for links to reported fatty liver disease or cirrhosis. They found a 20% to 30% increase in all forms of liver disease among late-night eaters compared with those who did not eat late. The report says earlier research had tied late-night snacking to heart disease and obesity. Lead author Robert Wilechansky, M.D., a hepatologist at OHSU, said this is among the first long-term analyses to explicitly connect it to fatty liver disease. He noted that as much as 30% of the U.S. population is affected by fatty liver disease. Why might timing matter? Wilechansky said the liver is closely tuned to the body's circadian rhythms, the internal clock that shapes our sleep-wake cycle. Co-author Andrew McHill, Ph.D., a sleep and circadian physiologist at OHSU, said eating at night, when the body clock is promoting sleep, reduces the body's ability to metabolize food efficiently. He said this can eventually lead to obesity, diabetes and, now, poor liver health. McHill also noted that animal research shows the liver to be among the organs most vulnerable to a mismatch between eating and sleep timing. The findings come with limits. Wilechansky cautioned that the study is observational and relies on broadly defined, self-reported data. That means it shows a link, not that late eating causes liver disease. Other differences between late-night eaters and everyone else could play a role. The risk also needs context. Wilechansky said that of the people who develop fatty liver disease, only a small fraction go on to serious forms such as cirrhosis. Still, he said the main takeaway is that confining calorie intake to the hours before bedtime might be beneficial. He noted this idea concerns timing, not changing what people eat. FOR YOU For readers thinking about healthy aging, the practical point is modest. Wilechansky's suggestion is that confining calories to the hours before bedtime might be beneficial, but the evidence so far does not show that moving meals earlier will protect the liver. Readers with liver disease or diabetes should talk with their clinician before making significant changes to eating patterns. WHAT TO WATCH NEXT According to News-Medical, Wilechansky is part of an OHSU team recruiting for a study that will monitor eating behavior directly and test whether eating earlier improves clinical measures of fatty liver disease. Direct measurement and an intervention study could help separate timing from the circumstances around it. That would make the finding more useful to patients. Source: News-Medical (reporting on an Oregon Health & Science University study in Clinical Gastroenterology and Hepatology) News-Medical (reporting on an Oregon Health & Science University study in Clinical Gastroenterology: https://www.news-medical.net/news/20261009/Late-night-snacking-may-affect-liver-health.aspx ---