Young plus size woman having stomachache on the sofa at home.
Restricting eating to an eight-hour window can drastically reduce the symptoms of inflammatory bowel disease (IBD), a new Canadian pilot study has shown. The study, published in the Gastroenterology journal, highlights that time-restricted feeding (TRF), a form of intermittent fasting, reduced symptoms of Crohn’s disease by 40% and abdominal discomfort by 50% over a 12-week period in individuals with obesity or overweight.
Despite these promising results, some experts caution against drawing broad conclusions from the study. Dr. Terri-Lynne South, Chair of RACGP Specific Interests Obesity Management, points out the study’s limitations, noting its small sample size and short duration. “It’s really important that these studies are done, to give people different management options, but we need to apply it to real life,” she said.
Understanding Time-Restricted Feeding
Time-restricted feeding involves consuming all meals within a set eight-hour window each day, followed by a 16-hour fasting period, without reducing overall calorie intake. The randomized controlled study from the University of Calgary tracked 35 adults with Crohn’s disease and overweight or obesity over 12 weeks. Of these, 20 participants followed the TRF regimen, while 15 continued with their usual diets.
According to the researchers, the TRF participants showed a significant decrease in visceral fat and key inflammatory markers in the blood, such as leptin and PAI-1. Additionally, the TRF group lost an average of 2.5 kilograms, whereas the control group gained approximately 1.7 kilograms.
“The magnitude of change observed within 12 weeks highlights TRF as a feasible adjunctive nutritional strategy in Crohn’s disease with overweight and obesity,” the researchers noted.
Expert Opinions and Criticisms
While the findings are encouraging, Dr. South emphasizes the need for longer-term studies to assess the sustainability of TRF as a treatment approach. “If we consider that Crohn’s disease is a chronic disease, we need to make sure that people can continue with the intervention lifelong,” she explained. Dr. South also questioned the adequacy of the control group, which followed a usual diet without time restrictions.
“What I’d really like to see is, is this actually more about a natural calorie restriction because of those time-restricted eating rules, as opposed to there being something special about having a longer gut rest,” she said. Dr. South noted that while time-restricted eating is a viable option for obesity management, the study’s limitations prevent it from being applied more broadly at this stage.
Implications for IBD Management
Crohn’s disease and ulcerative colitis, collectively known as IBD, affect about 180,000 people in Australia and approximately one in 10 people worldwide. Crohn’s and Colitis Australia reports that the growth of IBD in Australia is the highest in the western world, with local cases expected to reach 200,000 within the next decade.
“A lot of chronic diseases are increasing, so I’m not surprised,” Dr. South remarked, suggesting that environmental factors, particularly those affecting gut health, could be contributing to this trend.
“From a ‘does this make sense?’ point of view, yes, it does. But I just feel that there’s a lot of limitations to this study before we could apply it more generally,” Dr. South concluded.
Looking Ahead
The findings of this study open the door for further research into TRF as a potential management strategy for Crohn’s disease. However, experts like Dr. South emphasize the importance of long-term studies to evaluate the sustainability and real-world applicability of such interventions. As the prevalence of IBD continues to rise, understanding the role of diet and fasting in disease management remains a critical area of exploration.
