Adults consuming the most heavily processed grain products faced an 86% greater risk of developing inflammatory bowel disease, while fresh bread and rice were associated with lower risk, researchers reported.
By yourNEWS Media Newsroom
A large international study has found a significant association between frequent consumption of ultraprocessed grain products and the development of inflammatory bowel disease, adding to concerns that industrial processing may affect health differently than grains consumed in less-altered forms.
Researchers analyzed dietary and health data from 124,590 adults across 21 countries and found that participants consuming the highest quantities of ultraprocessed grains had an 86% greater risk of developing inflammatory bowel disease, or IBD, than those consuming the least.
Fresh bread and rice, by comparison, were associated with a lower risk, suggesting that the way grain foods are manufactured may be more important than the grain or carbohydrate content alone.
IBD is an umbrella term that includes Crohn’s disease and ulcerative colitis, two chronic conditions involving inflammation of the digestive tract.
The findings come as ultraprocessed foods make up a growing share of modern diets. Previous reports have estimated that such products now provide more than 60% of the calories consumed by the average American.
Researchers said the results demonstrate the importance of distinguishing minimally processed grains from packaged products containing industrial additives, preservatives, emulsifiers and refined ingredients.
International Study Tracks Diet and New IBD Diagnoses
The analysis drew from the Prospective Urban Rural Epidemiology study, commonly known as PURE, one of the world’s largest long-term investigations of nutrition and chronic disease.
Participants completed detailed food questionnaires designed to estimate how frequently they consumed different types of grain products.
Foods categorized as ultraprocessed included packaged pastries, sweetened breakfast cereals, crackers, refined snack products and other grain-based items containing industrial additives, emulsifiers, preservatives or multiple refined ingredients.
Researchers followed participants over time and recorded new diagnoses of Crohn’s disease and ulcerative colitis.
The analysis accounted for several factors that could influence disease risk, including age, smoking, exercise habits and overall dietary patterns.
Because the study was observational, it could identify an association but could not prove that ultraprocessed grain consumption directly caused IBD.
Processing Level Emerges as Key Difference
Participants consuming approximately 19 grams or more of ultraprocessed grain products per day had the highest observed risk.
Compared with those reporting the lowest intake, that group was 86% more likely to develop inflammatory bowel disease during the study period.
The contrasting findings for fresh bread and rice were particularly notable because both are grain-based carbohydrate foods.
Their association with lower IBD risk supports the researchers’ conclusion that industrial processing, rather than grain consumption by itself, may be the more relevant concern.
Ultraprocessed products often contain less naturally occurring fiber and fewer nutrients than their less-processed counterparts. They may also contain substances intended to improve flavor, texture, appearance, shelf life or manufacturing efficiency.
Researchers and health advocates have increasingly examined whether those characteristics contribute to changes in the gut microbiome, intestinal barrier and inflammatory response.
Additives and Reduced Fiber May Affect the Gut
The study proposed several possible explanations for the observed association.
Grains can lose substantial amounts of fiber during refining and manufacturing. Fiber serves as an important source of nourishment for beneficial intestinal bacteria and supports production of short-chain fatty acids.
Those fatty acids help maintain the cells lining the colon and play a role in immune regulation.
According to “Eat Better Forever,” diets dominated by highly processed products can reduce short-chain fatty acid production, weaken microbial diversity and leave the digestive system more vulnerable to inflammation.
Some ultraprocessed grain products also contain emulsifiers, stabilizers, artificial flavors and preservatives.
Synthetic emulsifiers used in products such as packaged bread and ice cream have been shown in previous research to affect the protective intestinal lining. Researchers have proposed that this damage may increase gut permeability and allow substances to cross the intestinal barrier more easily, potentially contributing to local and systemic inflammation.
Modern diets high in processed foods have also been associated with dysbiosis, an imbalance in the microorganisms living in the digestive system.
Dysbiosis has been linked to impaired intestinal-barrier function and abnormal immune activity, although the relationship between food additives, the microbiome and inflammatory disease remains under investigation.
The researchers said the combined effects of reduced fiber, altered microbial activity and exposure to industrial additives could help explain why heavily processed grain foods were associated with higher IBD risk.
Findings Do Not Require Avoiding All Grains
The results do not suggest that consumers need to eliminate bread, rice, pasta or other grain foods entirely.
Instead, researchers emphasized selecting products that remain closer to their original form and contain fewer industrial ingredients.
Suggested alternatives include plain oatmeal instead of highly sweetened breakfast cereals, fresh or whole-grain bread instead of packaged pastries, and rice or quinoa in place of heavily processed grain-based side dishes.
Beans, vegetables and intact whole grains also provide fiber that supports beneficial gut bacteria.
Plant-rich dietary patterns have been associated with a lower risk of inflammatory bowel disease, according to previous research, although no individual food can determine whether a person will develop IBD.
Consumers can also examine ingredient lists for signs that a product has undergone extensive processing.
Multiple refined starches, artificial colors, emulsifiers, stabilizers and long lists of additives can indicate that a grain product is ultraprocessed.
Replacing those products gradually with minimally processed alternatives may help improve the overall quality of the diet without requiring the complete removal of an entire food category.
Genetics and Other Factors Still Influence Risk
The researchers cautioned that inflammatory bowel disease develops through a complex interaction of genetic susceptibility, immune function, environmental exposures and dietary patterns.
Ultraprocessed grain consumption is therefore only one possible contributor.
No single breakfast cereal, pastry or snack food determines whether someone will develop Crohn’s disease or ulcerative colitis.
Dietary habits repeated over years, however, may shape the intestinal environment and influence inflammation, microbial diversity and metabolic health.
The peer-reviewed study adds to a growing body of evidence associating high consumption of ultraprocessed foods with poorer digestive and overall health outcomes.
Its findings also underscore that labels such as grain-based, plant-based or vegetarian do not necessarily indicate that a product is minimally processed or supportive of gut health.
As increasingly complex packaged foods enter the marketplace, the researchers concluded that processing level should be considered alongside nutrients, calories and food categories when evaluating dietary choices.
Source: Natural News
Original article
Comments