Time-Restricted Eating and Liver Fat: What a Trial Found

A randomized trial in adults with overweight or obesity tested whether eating within an 8-hour window reduces liver fat, and whether it matters if the window is early, late or chosen by the participant. Liver fat fell in all three time-restricted groups. But the reduction was not significantly greater than in a comparison group that received the same diet education without any eating window.

The larger reductions were seen in people who lost at least 5% of their body weight and in people who started with fatty liver disease. The authors' conclusion is that the timing of the window may not affect liver fat beyond the effect of weight loss.

What the study did

The paper was published online on 7 July 2026 in JHEP Reports. It comes from a multicenter randomized trial in Spain, registered at ClinicalTrials.gov as NCT05310721.

Everyone in the trial received "usual care", which here meant a Mediterranean diet-based education program. Participants (50% women) were then assigned to one of four groups for 12 weeks:

Group	Participants	What they did
Usual care	49	Mediterranean diet education only
Early TRE	49	Education plus an 8-hour eating window early in the day
Late TRE	52	Education plus an 8-hour eating window later in the day
Self-selected TRE	47	Education plus an 8-hour window at a time they chose

TRE stands for time-restricted eating. The abstract does not give the clock times of the early and late windows, so they are not stated here.

Liver fat was measured as hepatic fat fraction by magnetic resonance imaging. The researchers also assessed liver markers (elastography-based measurements, liver enzymes and circulating biomarkers) and analyzed fecal microbiota by 16S rRNA gene sequencing.

What it found

Liver fat fell within each TRE group. The reduction in hepatic fat fraction was statistically significant inside all three time-restricted groups (all p ≤ 0.02).

It did not fall significantly more than with usual care. Compared with the usual care group, the mean differences were:

• early TRE: -0.4% (p = 0.95)
• late TRE: -1.5% (p = 0.15)
• self-selected TRE: -0.7% (p = 0.77)

None of these is statistically significant. The three TRE groups also did not differ from one another (all p ≥ 0.41).

Other liver markers and the microbiota showed no group differences. The abstract reports no between-group differences in liver health markers or in fecal microbiota.

Weight loss and starting point made the difference. Participants who achieved at least 5% weight loss had greater reductions in liver fat than those who did not (mean difference -2.6%, p < 0.001). So did participants who had metabolic dysfunction-associated steatotic liver disease (MASLD, the current name for what used to be called non-alcoholic fatty liver disease) at the start, compared with those who did not (mean difference -2.7%, p < 0.001).

More people in the TRE groups reached that 5% mark. Between 41% and 44% of participants in the TRE groups achieved at least 5% weight loss, compared with 16% in usual care (p = 0.001).

How to read these results together

More people in the TRE groups lost a meaningful amount of weight, yet those groups as a whole did not beat usual care on liver fat. The abstract's framing is that the reductions in liver fat in this setting "are more closely linked to weight loss and baseline steatosis than to eating window timing." An eating window may be one route by which some people lose weight. In this trial, there was no sign that the window did something extra for the liver on top of that, and the liver fat comparison between groups did not reach significance.

The authors draw a practical conclusion for clinicians: prioritize feasible eating schedules and strategies that help patients reach clinically meaningful weight loss, particularly in people with MASLD.

What it does not show

• These were secondary outcomes. The abstract states plainly that "the study was not powered for secondary outcomes." The trial was not sized to detect differences in liver fat or microbiota, so a real but modest difference between groups could have been missed.
• The comparison group was not doing nothing. Usual care was an active Mediterranean diet education program. The trial compares "education plus a window" with "education", not fasting with no intervention.
• Twelve weeks. The abstract does not report what happened to liver fat or weight after the program ended.
• The weight-loss and MASLD results are comparisons within the trial population, between people who did and did not lose 5%, and between those with and without MASLD at baseline. People were not randomized to lose weight, so these comparisons show an association.

If you have, or might have, a liver condition

Fatty liver disease and any other liver condition are for a doctor to diagnose and manage. This was research carried out under supervision, with imaging and blood tests, and it is not a treatment to try alone. If you have been told you have a fatty liver, raised liver enzymes or any liver diagnosis, talk to your doctor before changing how you eat, and do not use an eating window as a substitute for the follow-up they recommend.

This is general information, not medical advice. If you are pregnant or breastfeeding, have diabetes or take blood-sugar medication, have a history of eating disorders, take other regular medication, or are under 18, talk to a doctor before fasting.

What this means if you fast

If you use an 8-hour window, this trial suggests you do not need to worry much about whether it sits early or late in the day as far as liver fat is concerned: the groups did not differ, with the caveat that the study was not powered for that question. A window you can keep is a reasonable basis for choosing. The 16:8 schedule page describes the pattern, and how to choose the right fasting schedule for your lifestyle helps with placing it in your day.

It also suggests not crediting the clock with more than it has earned. In this study an eating window was not shown to improve liver fat beyond a diet education program, and the improvements that stood out went with weight loss.

QoFast is a fasting tracker app for iPhone and Android with intermittent plans including 16:8, 18:6, 20:4, OMAD and custom windows, so you can set the 8 hours wherever they fit your day. It tracks time, water and mood, not liver health, and it gives general information, not medical advice. It is free to download with an optional Pro subscription: App Store and Google Play.

FAQ

Does intermittent fasting reduce liver fat? In this trial liver fat fell within each of the three 8-hour eating window groups, but not significantly more than in the group that received Mediterranean diet education alone.

Is an early eating window better for the liver than a late one? The trial found no difference between early, late and self-selected windows. It was not powered for this outcome, so a small difference cannot be excluded.

Can time-restricted eating treat fatty liver disease? This study does not show that. Liver disease should be managed with a doctor.

Sources

• Dote-Montero M, Clavero-Jimeno A, Cortés-Martín A, et al. "Time-restricted eating, liver health, and fecal microbiota in adults with overweight or obesity: A randomized controlled trial." JHEP Reports, published online 7 July 2026. DOI: 10.1016/j.jhepr.2026.101956, PubMed 42413768