Is Eating Late at Night Bad? What a 2026 Study Found

Eating late at night is linked with liver disease in a large US study. In research published online 9 October 2026 in Clinical Gastroenterology and Hepatology, nearly 200,000 adults who reported eating after dinner or after bedtime had a 20% to 30% higher risk of liver disease, covering fatty liver disease (MASLD) and cirrhosis, than those who did not, according to Oregon Health & Science University (OHSU), which led the study.

Key takeaways

• A 2026 study led by Robert Wilechansky at Oregon Health & Science University (OHSU) pooled three long-running US cohorts: the Nurses’ Health Study, the Nurses’ Health Study II and the Health Professionals Follow-up Study.
• Late-night eating meant eating after dinner or after bedtime. OHSU reports a 20% to 30% higher risk of liver disease among late-night eaters, covering fatty liver disease and cirrhosis.
• Press coverage of the paper (ScienceAlert) gives more detail: 199,155 adults with a median age of 59, a median 16-year follow-up, and a 36% higher risk of fatty liver disease and a 28% higher risk of cirrhosis after adjusting for age, body mass index and physical activity. The paper’s abstract was not publicly available to check these figures.
• The study is observational and self-reported, so it shows an association, not cause. Cirrhosis stayed uncommon: ScienceAlert reports 315 cases among nearly 200,000 people.
• One habit to try: make dinner the last food of the day and keep a gap of about 3 hours between it and lights-out.

What did the 2026 late-night eating study find?

People who said they ate late at night were more likely to develop liver disease over the following years. Wilechansky and colleagues, including Andrew McHill of OHSU’s Sleep, Chronobiology, and Health Laboratory and Tracey Simon and Andrew Chan of Massachusetts General Hospital, drew on diet and lifestyle habits that participants reported on questionnaires, then looked for links with reported fatty liver disease or cirrhosis.

The percentages are relative: they compare late-night eaters with people who did not eat late, not the share of late-night eaters who became ill. Fatty liver disease is common, affecting as much as 30% of the US population by OHSU’s figure, while only a small fraction of people with it go on to cirrhosis.

Why would the timing of food matter to the liver?

The liver keeps its own daily rhythm, tuned by the body clock and by when food arrives. Late in the evening, as melatonin rises, the body is preparing for sleep rather than for processing a meal.

Trials and lab studies show how late eating plays out in the body:

• In a randomized crossover trial in The Journal of Clinical Endocrinology & Metabolism (Gu and colleagues, 2020), 20 healthy young adults ate the same dinner at 6 PM or at 10 PM with a fixed 11 PM to 7 AM sleep. The late dinner led to higher blood sugar overnight and less burning of the meal’s fat, especially in people who usually went to bed earlier.
• In a randomized crossover trial in Cell Metabolism (Vujović and colleagues, 2022), adults with overweight or obesity ate the same meals on an early or a late schedule. Late eating raised hunger, shifted appetite hormones and lowered energy use while awake.
• In a 2017 observational study in The American Journal of Clinical Nutrition (McHill and colleagues), 110 young adults aged 18 to 22 photographed everything they ate for 7 days. Those with more body fat ate most of their calories about 1.1 hours closer to their evening melatonin rise, though the clock hour of their meals did not differ.

Together these point the same way as the 2026 cohort: food eaten close to biological night is handled less well.

What are the limits of the study?

This study cannot prove that late-night eating causes liver disease. OHSU describes the data as observational, broadly defined and self-reported, and liver disease came from reported diagnoses. ScienceAlert adds that sleep timing and sleep quality were not accounted for, and what people ate late was not recorded. People who snack late may also differ in other ways, such as diet quality, alcohol use or work schedules. Participants were US nurses and health professionals, so results may differ in other groups. OHSU is now running a clinical study that records meal timing directly and tests whether eating earlier changes liver measures in people with fatty liver disease.

What is one habit to try?

Make dinner the last food of the day, and leave about 3 hours between it and lights-out. It is an everyday habit in line with the study’s pattern, not a tested treatment for liver disease or a proven way to prevent it, and it does not replace care from a clinician for any liver condition.

1. Set your lights-out first, then place dinner so it ends about 3 hours before it.
2. Make dinner a full, satisfying meal so the evening does not turn into grazing.
3. After dinner, close the kitchen: tidy up and switch to water or a caffeine-free tea.
4. Fill the evening with something other than food: a walk, time with family, a book.
5. Keep the gap on weekends too, since a steady schedule helps the body clock.

For more on the timing of the evening meal, read Best Time to Eat Dinner? What the Evidence Says, and on steady meal times, Do Regular Meals Matter? What a 2026 Study Found. If you work nights, see Night Shift Schedule: How to Plan Sleep, Meals and Light, and keep coffee early with Caffeine Cutoff Time: When to Have Your Last Coffee. Curious when your own body clock runs best? Take the Body Clock Type quiz.

Your day on My BodyClock

The day above on My BodyClock ends eating with dinner from 6:15 to 7:15 PM and puts lights-out at 10:30 PM, a gap of more than 3 hours. Breakfast at 7:30 AM and lunch at 12:30 PM keep meals in daylight. After dinner, family time, a short tidy-up that closes the kitchen and a screen-light wind-down with a book fill the evening, so there is no late snack to plan around. A morning walk and a ride after work add daylight and movement.

Build your own evening with a closed kitchen in Owaves: My BodyClock on the App Store, or join the Android waitlist.

FAQ

Is eating late at night bad for your liver?

A large 2026 study linked it with higher risk. Among nearly 200,000 US adults, people who reported eating after dinner or after bedtime had a 20% to 30% higher risk of liver disease, including fatty liver disease and cirrhosis, according to OHSU, which led the study. Press coverage reports the paper’s figures as 36% for fatty liver disease and 28% for cirrhosis over a median of 16 years. The study was observational, so it shows an association, not proof of cause.

How long before bed should you stop eating?

The 2026 study did not test a cut-off, but leaving about 3 hours between dinner and lights-out is a simple habit to try. In a lab trial in healthy young adults, a 10 PM dinner, an hour before bed, raised overnight blood sugar compared with a 6 PM dinner. Start by moving the last bite earlier by 30 minutes at a time.

What counts as late-night eating?

In the 2026 study, it meant eating after dinner or after going to bed, as reported on questionnaires; OHSU describes the data as broadly defined. What matters for the body clock is how close food comes to your own biological night, which starts a few hours before you usually fall asleep.

Does the time you eat matter if the food is healthy?

Timing seems to matter on its own. In controlled crossover trials, the same food eaten later raised hunger and overnight blood sugar compared with eating earlier. Quality and amount still count, so a wholesome dinner at a steady, earlier time covers both.

Sources

1. Wilechansky RM, Casey K, McHill AW, Chan AT, Simon TG. Late-Night Eating is Associated with MASLD and Cirrhosis: The Nurses’ Health Study and Health Professionals’ Follow-Up Study. Clinical Gastroenterology and Hepatology, published online 9 October 2026. doi:10.1016/j.cgh.2026.09.047. https://doi.org/10.1016/j.cgh.2026.09.047
2. Oregon Health & Science University. Late-night eating may be bad for your liver, study suggests. OHSU News, 9 October 2026. https://news.ohsu.edu/2026/10/09/late-night-eating-may-be-bad-for-your-liver-study-suggests
3. David Nield. One Common Eating Habit Is Linked to Higher Risk of 2 Liver Diseases. ScienceAlert, 16 October 2026. https://www.sciencealert.com/one-common-eating-habit-is-linked-to-higher-risk-of-2-liver-diseases
4. Gu C, Brereton N, Schweitzer A, et al. Metabolic Effects of Late Dinner in Healthy Volunteers: A Randomized Crossover Clinical Trial. Journal of Clinical Endocrinology & Metabolism, 2020;105(8):2789-2802. doi:10.1210/clinem/dgaa354. https://pmc.ncbi.nlm.nih.gov/articles/PMC7337187/
5. Vujović N, Piron MJ, Qian J, et al. Late isocaloric eating increases hunger, decreases energy expenditure, and modifies metabolic pathways in adults with overweight and obesity. Cell Metabolism, 2022;34(10):1486-1498. doi:10.1016/j.cmet.2022.09.007. https://pmc.ncbi.nlm.nih.gov/articles/PMC10184753/
6. McHill AW, Phillips AJ, Czeisler CA, et al. Later circadian timing of food intake is associated with increased body fat. American Journal of Clinical Nutrition, 2017;106(5):1213-1219. doi:10.3945/ajcn.117.161588. https://pmc.ncbi.nlm.nih.gov/articles/PMC5657289/

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