Few topics spark as much heated debate in nutrition as ultra-processed foods . While internet culture often labels them toxic, nutrition scientists are far more divided. Some researchers point to chemical additives that might irritate the gut lining, others focus on how industrial processing strips natural food structure to drive overeating, and many argue the real issue is simply hyperpalatability. Amid this debate, a review published in Life proposed a new theory called the Three-Layer Ecosystem Disruption model, which suggests that long-term consumption of processed foods could systematically erode gut health over a lifetime.

According to the authors, this hypothetical damage unfolds in three stages. First, food additives thin the gut’s protective mucus shield and loosen the seals between intestinal cells. Second, this shifts the microbiome by wiping out beneficial, anti-inflammatory bacteria and letting harmful microbes multiply.…