Great question! Research shows up to 91% of autistic individuals experience GI issues like constipation or diarrhea, which often worsen behavioral symptoms. Studies suggest gut dysbiosis (microbial imbalance) disrupts brain signaling via serotonin and the vagus nerve, potentially driving ASD traits. In promising trials, microbiota transfer therapy improved both gut health and autism severity—some participants gained over a year in developmental age. Practical steps include early GI screening, probiotics, and dietary diversity to support gut-brain balance. For more details, check out sources like the Kennedy Krieger Institute’s gut-brain report or recent studies on fecal transplants. Let me know if you'd like specific links!