British Dietetic Association guidelines mark a departure from blanket fiber recommendations for the 10% of adults experiencing chronic constipation. The new protocols advocate for specific food interventions rather than generic high-fiber approaches, acknowledging that fiber type and source matter more than total quantity. This shift reflects growing recognition that soluble versus insoluble fiber affects gut transit differently, and that individual microbiome variations influence fiber tolerance. The targeted approach aligns with emerging research showing certain fermentable fibers can worsen symptoms in some patients, particularly those with small intestinal bacterial overgrowth or irritable bowel syndrome overlap. Rather than the traditional advice to simply increase total fiber intake, the guidelines likely emphasize specific foods like kiwi fruit, prunes, and particular prebiotic compounds that demonstrate consistent efficacy in clinical trials. This evidence-based pivot represents a maturation in nutritional gastroenterology, moving from one-size-fits-all recommendations toward personalized interventions. The change could significantly improve treatment outcomes for constipation sufferers who previously found high-fiber diets ineffective or counterproductive, while highlighting the need for practitioners to understand fiber's complex relationship with individual digestive physiology.