Eating meals or snacks late in the evening is associated with a 20% to 30% higher risk of developing liver disease, according to a large-scale analysis led by researchers at Oregon Health & Science University (OHSU). Published on October 9, 2026, in the peer-reviewed journal Clinical Gastroenterology and Hepatology, the study evaluated long-term health data from nearly 200,000 adults across the United States. The findings suggest that when people consume food may play a notable role in metabolic and organ health, independent of what they eat.

While medical guidance has long connected late-night eating with weight gain, obesity, and cardiovascular strain, researchers sought to determine whether meal timing also influences the liver. According to ScienceDaily, the investigation is among the first long-term population analyses to explicitly tie nighttime calorie consumption to chronic liver conditions, including metabolic dysfunction-associated steatotic liver disease (MASLD)—commonly known as fatty liver disease—and cirrhosis.

Analyzing Nearly 200,000 Health Records

To investigate how daily routines affect the liver over time, the OHSU research team examined records from three major nationwide cohorts: the Nurses’ Health Study, the Nurses’ Health Study II, and the Health Professionals Follow-up Study. Together, these datasets encompassed nearly 200,000 participants who were tracked for an average of approximately 16 years, as reported by the New York Post.

Participants regularly provided detailed information regarding their dietary habits, daily schedules, and broader lifestyle factors. Researchers categorized the individuals based on their typical eating windows and compared those habits against documented diagnoses of fatty liver disease and cirrhosis.

While multiple outlets, including DPA International and KPRC Click2Houston, report an overall 20% to 30% increased risk of liver disease among late eaters, specific risk estimates varied slightly across secondary summaries. Coverage from Yahoo Japan News notes that the data pointed to a 36% higher risk specifically for fatty liver disease and a 28% higher risk for cirrhosis, adding that the link persisted even after researchers accounted for obesity, diabetes, physical activity, alcohol consumption, and overall diet composition.

How the Body’s Internal Clock Affects the Liver

Scientists point to the body's circadian rhythm—the internal 24-hour biological clock that regulates sleep, hormone release, and metabolism—as a primary explanation for the findings. The liver is heavily involved in processing nutrients, managing blood sugar, and regulating how the body stores energy. These metabolic functions are closely synchronized with daylight and natural waking hours.

"We know the liver is very much in tune with the body’s circadian rhythms," lead study author Dr. Robert Wilechansky, a hepatologist at OHSU specializing in liver transplantation, told DPA International. "So we’re interested in changing the timing of eating in a way that could make a difference in health without changing the composition of what people eat."

Dr. Wilechansky noted that his interest in the subject was partly inspired by earlier clinical evidence involving night shift workers, whose inverted schedules frequently clash with natural sleep and wake cycles. When food is introduced late at night, the liver is forced to process nutrients at a time when the body is biologically preparing for rest.

Dr. Andrew McHill, a sleep and circadian physiologist at OHSU, explained that mistimed daily habits can disrupt normal metabolic efficiency. "We have shown that eating during the night, when the internal biological clock is promoting sleep, reduces the ability of your body to metabolize foods as efficiently and can eventually lead to obesity, diabetes and now poor liver health," McHill said in remarks published by DPA International.

Understanding Fatty Liver Disease and Cirrhosis

Fatty liver disease affects up to 30% of the U.S. population, according to ScienceDaily. The condition occurs when excess fat accumulates inside liver cells. Over time, this buildup can trigger chronic inflammation and cellular damage, potentially progressing into cirrhosis—a severe condition characterized by extensive, permanent scarring of the liver tissue.

In its early stages, fatty liver disease frequently presents no noticeable symptoms. When advanced liver scarring or cirrhosis develops, patients may experience persistent fatigue, weakness, loss of appetite, nausea, itchy skin, reduced sex drive, and jaundice (a yellowing of the skin and eyes).

Despite the elevated relative risks identified in the study, clinicians emphasize that most people who develop fatty liver disease do not progress to severe scarring. "It’s important to remember, of the people who developed fatty liver disease, only a small fraction develop serious forms of the condition like liver cirrhosis," Dr. Wilechansky noted. "Even so, the big take-away here is that confining your calorie intake to several hours before bedtime might be beneficial."

What This Means for Your Daily Routine

For everyday readers, the findings highlight a straightforward, low-cost adjustment that may support long-term metabolic wellness: leaving a buffer of several hours between the final meal or snack of the day and bedtime. However, health experts and study authors alike caution against interpreting the results as definitive proof of cause and effect.

As KPRC Click2Houston and Prevention point out, the research was strictly observational and relied on participants self-reporting their eating habits. Because of this design, the study cannot prove that late-night snacking directly causes liver disease, and unmeasured lifestyle or environmental factors could still contribute to the observed patterns.

How did the study define late-night eating?

Published reports describe the habit variously as eating "after dinner," "late in the evening," "around bedtime," or "after bedtime." The public summaries do not establish a strict clock-time cutoff, focusing instead on food consumption that occurs close to an individual's normal sleep window.

Can shifting meal times reverse liver damage?

An observational study cannot confirm whether changing meal times will actively prevent or reverse liver disease. To answer that question, Dr. Wilechansky is currently involved in a follow-up clinical study at OHSU examining whether shifting food consumption earlier in the day produces measurable health improvements in patients who already have underlying fatty liver disease.

Sources