Nutrition & DietLate-Night Eating Under Stress Doubles Gut Trouble and Wrecks Microbiome Diversity
New research presented at Digestive Disease Week 2026 reveals that combining chronic stress with late-night eating creates a compounding threat to gut health. Analyzing data from over 11,000 participants in the National Health and Nutrition Examination Survey and 4,000 in the American Gut Project, scientists found that people under high stress who consumed more than 25% of daily calories after 9 p.m. were up to 2.5 times more likely to experience constipation or diarrhea. Crucially, these individuals also showed reduced gut microbiome diversity — a key marker of digestive and overall health. The findings support the emerging field of chrononutrition, suggesting that meal timing interacts with the gut-brain axis to amplify stress-related digestive disruption. Simple habit shifts like eating earlier may offer meaningful gut health benefits.
