Previously reactive foods can be reintroduced. Some children do remain sensitive. This is treated using Isopathy, a homeopathic technique that uses the sensitising substances in homeopathic dilution to treat it. Food allergy testing is not done as routine in view of the invasive nature and the costs involved. The diet widens in general because the child has an increasing sense of taste and smell which are both Zinc dependent.
Perception improves leading to an apparent appreciation of more subtle tastes.
A stable immune system increase tolerance of foods. Infections Immunology testing shows that significant numbers of autistic children have inadequately performing immune systems. Auto immune CNS damage Whilst antibodies have been demonstrated, this is not an auto-immune disease. It is a consequence of immune instability and the metabolic consequences of that disorder. There is no evidence to support a lupus like auto immune brain disorder.