Having lived with fistulizing Crohn’s disease since 2002, I’ve tried my share of dietary approaches over the years. Some worked, some didn’t, and some fell somewhere in between. Intermittent fasting is one that I’ve experimented with periodically — not as a cure or primary treatment, but as something that might help me manage symptoms alongside my medical care.

After years on Remicade and my recent transition to Rinvoq in 2026, I’ve learned to approach any dietary change with the same measured skepticism I bring to reading research papers. What works for one person with Crohn’s might be a disaster for another. What helps during remission might backfire during a flare.

What I Mean by Intermittent Fasting

When I talk about intermittent fasting, I’m referring to the 16:8 approach — eating within an 8-hour window and fasting for 16 hours. I’m not talking about extended fasts or more restrictive protocols. With Crohn’s, I’ve learned that extreme approaches to anything, including diet, tend to create more problems than they solve.

I typically eat between noon and 8 PM, which means skipping breakfast and having an early dinner. This isn’t a rigid schedule — if I’m traveling, stressed, or not feeling well, I adjust. Flexibility matters more than perfect adherence when managing a chronic disease.

How It Affects My Symptoms

The most noticeable effect for me has been on bloating and abdominal discomfort. During periods when I’ve maintained a consistent 16:8 pattern, I’ve experienced less of the post-meal bloating that used to be a daily occurrence. My theory — and it’s just a theory — is that giving my digestive system longer breaks between meals reduces the overall inflammatory load.

I’ve also noticed that my energy levels feel more stable throughout the day. Instead of the post-lunch crash I used to experience, I maintain more consistent energy from lunch through dinner. This could be related to blood sugar stability, though I haven’t measured it formally.

What intermittent fasting doesn’t do for me is eliminate Crohn’s symptoms entirely. I still have days when my gut feels inflamed regardless of when I eat. It doesn’t prevent flares. It certainly doesn’t replace my medication. It’s more like a tool that sometimes helps me feel a bit better on good days.

The Challenges

The biggest challenge with intermittent fasting and Crohn’s is that it can be difficult to maintain during flares. When I’m experiencing active symptoms, I often need to eat smaller, more frequent meals to manage nausea and ensure I’m getting enough nutrition. Forcing a 16-hour fast when my body is already struggling doesn’t make sense.

There’s also the medication timing issue. Some of my medications need to be taken with food, which can complicate fasting windows. I’ve had to adjust my eating schedule around my medication schedule, not the other way around.

Social situations can be tricky too. When dinner plans conflict with my eating window, (they usually don’t) I choose the social connection over the fasting schedule. After more than two decades with this disease, I’ve learned that isolation is worse for my overall health than missing a few fasting periods.

What the Research Shows

The research on intermittent fasting and IBD is limited and mostly observational. There are some small studies suggesting potential benefits for inflammation markers, but nothing that would change how I approach my medical treatment. Most of the research has been done in animal models or healthy populations, not specifically in people with Crohn’s or ulcerative colitis.

I’ve read studies showing that time-restricted eating might influence gut microbiome composition and reduce systemic inflammation, but the evidence isn’t strong enough to recommend it as a treatment for IBD. The mechanisms are plausible — giving the gut regular rest periods could theoretically reduce inflammatory stress — but plausible mechanisms don’t always translate to clinical benefits.

What I find most telling is that none of the major IBD organizations or gastroenterology societies recommend intermittent fasting as a treatment approach. That doesn’t mean it’s harmful, but it does mean the evidence isn’t there yet to support it as medical therapy.

My Current Approach

I practice intermittent fasting when it feels sustainable and stop when it doesn’t. During stable periods, I might maintain a 16:8 schedule for weeks or months. During flares or stressful periods, I eat when I need to eat.

I track how I feel, but I don’t obsess over it. If I notice that fasting seems to coincide with better symptom control, I continue. If I notice increased symptoms or difficulty maintaining weight, I adjust.

Most importantly, I’ve never changed my medical treatment based on how intermittent fasting makes me feel. My biologics, regular monitoring, and relationship with my gastroenterologist remain the foundation of my Crohn’s management. Intermittent fasting is supplementary at best.

What This Means for Me Right Now

Intermittent fasting isn’t a game-changer for my Crohn’s management, but it’s a tool that sometimes helps. I approach it the same way I approach any dietary intervention — as something to experiment with carefully, not as a replacement for proven medical treatment.

The honest assessment after several years of on-and-off experimentation: it might help with some symptoms some of the time, but it’s not transformative. I continue to use it when it feels beneficial and abandon it when it doesn’t.

For anyone with IBD considering intermittent fasting, my advice would be to start conservatively, pay attention to how it affects symptoms, and maintain regular communication with the medical team. What works for me might not work for someone else, and what helps during remission might be counterproductive during active disease.

After 24 years with this disease, I’ve learned that sustainable approaches beat perfect ones every time. Intermittent fasting, when I practice it, is just one small part of a much larger management strategy that prioritizes medical treatment, stress management, and maintaining the flexibility to adjust when life with Crohn’s inevitably throws me a curveball.