Questions about dairy, eggs, sugar, probiotics and gut tests are common. Autism is not caused or cured by a particular food, and restrictive diets can create nutrient gaps—especially in selective eaters. Start with a simple food-and-symptom diary and discuss persistent pain, constipation, diarrhoea, reflux or poor growth with a paediatrician. A registered dietitian can protect protein, calcium, iron and vitamin intake before foods are removed. Gut, candida, intolerance or allergy tests should be ordered only when clinically indicated. Introduce changes one at a time, avoid sudden exclusions, and never replace prescribed care with supplements. Seek urgent advice for dehydration, blood in stool or significant weight loss.
Trusted reference: NHS guidance on eating, diet and neurodivergence.