16:8 Time-Restricted Feeding Cut Crohn's Disease Activity by 40% in 12 Weeks: What the Research Shows

16:8 Time-Restricted Feeding Cut Crohn's Disease Activity by 40% in 12 Weeks: What the Research Shows

Medical disclaimer: This article summarises published research for informational purposes only. It is not medical advice and is not a substitute for guidance from a qualified health professional. Always consult your doctor before starting any fasting protocol, especially if you have an existing health condition or take medication.

The Short Version

• What they tested: Eating all your food inside an 8-hour window each day. The people in the study had Crohn's disease.
• Who did it: Natasha Haskey and her team at the University of British Columbia, in Canada. It was published in the journal Gastroenterology in February 2026.
• How many people: 35 adults who already had Crohn's disease. About 6 in every 10 were women, and the middle age was 49.
• How long: 12 weeks.
• What happened: Their Crohn's symptoms dropped by about 40%. Their stomach pain dropped by about half, and so did the inflammation in their body.
• Read the study yourself: Gastroenterology, 2026 →

What They Wanted to Find Out

Crohn's disease makes the gut sore and swollen inside. It brings stomach pain, diarrhoea and tiredness that comes and goes. Around 3 million people in North America live with it. Almost all of the treatment is medicine.

The researchers asked a simple question. If people keep eating the same food, but only inside an 8-hour window, does the gut calm down?

Nobody was told to eat differently. Only the clock changed. That is what makes this study interesting for anyone reading about fasting and gut health or about fasting and inflammation.

Who Was in the Study

Who they were. All 35 had Crohn's disease already. The middle age was 49. About 6 in every 10 were women.

All of them were above a healthy weight. A gut test showed inflammation in all of them when the study started.

What the fasting actually looked like. Each person picked their own 8-hour window. Outside it they drank water, black coffee or plain tea.

They did this 6 days a week. One day a week was a free day. Nobody was asked to change what they ate, only when.

Everyone stayed on their usual medicine the whole time.

What Happened

The fasting group's Crohn's symptoms dropped by about 40% in 12 weeks. The comparison group's did not really move at all.

In plain words:

• Their stomach pain roughly halved.
• A good number of them moved from "active illness" towards "quiet illness" scores.
• The blood tests that show inflammation improved.
• They lost weight without being put on a diet.
• They lost fat from around the organs, deep inside the belly. That is the fat most tied to inflammation.
• The other group put weight on over the same 12 weeks.

What Did Not Change

• Nobody changed their medicine. The fasting worked on top of the medicine, not instead of it.
• Nobody was told what to eat, and nobody checked what they ate.
• Muscle was not measured in this study. So we cannot say whether they kept it or lost it.

What the Researchers Said

Their conclusion was short. Changing only the hours of eating, and nothing else, was enough to calm Crohn's disease down over 12 weeks.

They called it a cheap and simple thing to try alongside normal treatment. They also said it needs testing on more people before anyone treats it as proven.

What This Means for You

• The clock matters, not just the plate. Nobody in this study changed their food. The gut still calmed down.
• Most of the people here were women. About 6 in every 10. So these results speak to women more directly than most fasting studies do.
• You do not have to fast every day. They fasted 6 days a week and took one free day. It still worked.
• A 40% drop happened in a hard illness. If it can move Crohn's, 16:8 fasting may well calm milder gut trouble too.
• Weight and inflammation moved together. The people who lost the deep belly fat had the biggest drop in inflammation.
• This goes with your treatment, never instead of it. If you have a gut illness, talk to your doctor before you try it.

What This Study Could Not Tell Us

• Only 35 people finished it. That is small, and small studies can be wrong.
• Everyone in it was above a healthy weight. We do not know what happens to slimmer people.
• 12 weeks is short. Nobody knows what a year of this would do.
• People were on different medicines. That makes it harder to be sure the fasting did all the work.
• Nobody watched what they ate. Having a set window may have quietly changed their food too.
• The money came from a Crohn's charity. That is a normal funder, but it is worth knowing.

Nothing here is proof. It is one good, early study.

The Study Details

Common Questions

Does fasting help Crohn's disease?

In this study it did. Symptoms dropped by about 40% in 12 weeks. Stomach pain dropped by about half. The group that carried on as normal did not improve. It is one small study, so it is a good sign and not a promise.

What exactly did they do?

They ate all their food inside an 8-hour window. The other 16 hours they had water, black coffee or plain tea. They did this 6 days a week, with one free day. They did not change what they ate.

Can fasting calm inflammation in the gut?

This study says yes. The long gap without food seems to give the gut a rest. The blood tests that show inflammation improved by about half over 12 weeks, even though nobody changed their food.

Should I try this if I have Crohn's disease?

Ask your doctor first. In the study, everyone stayed on their medicine the whole time. Fasting was added on top of treatment. It was never used instead of it.

What happened to their weight?

The fasting group lost about 2.5 kg, which is 5.5 lbs. The other group gained about 1.7 kg, which is 3.7 lbs. The fasting group also lost fat from deep inside the belly.

Does this matter if I do not have Crohn's disease?

Probably, yes. The gut rest that seems to help here is not special to Crohn's. It is what the body does whenever you leave a long gap without food.

More Research Like This

• Fasting and gut health: what the science shows
• Does fasting bring inflammation down?
• What 16:8 fasting actually is
• Fasting and inflammation: the research, explained simply
• Can fasting help with IBS or a difficult stomach?
• Autophagy (the body's cell clean-up), explained
• What Ramadan fasting did to the gut, in a 2021 study

Track every fast automatically — get FastSyncer on the App Store — your first week is free.