Autism, ADHD and any other behavioral condition can be very complicated. There can be multiple factors happening in the body to cause specific behaviors. I believe in a holistic approach with determining what factors are at the root of the behaviors and treating those at the core.
Here is a list of some of the most common symptoms/behaviors seen with children on the spectrum, ADHD, or sensory processing disorders as well as possible underlying factors to consider. Many factors associated with these kids can be related to nutrition. Remember, each child is different, but these are common associations.