There are many people who feel that diet is a key factor in causing or managing some of the problems experienced by people on the autism spectrum.
Special diets involve eating more or less of specific foodstuffs.
For example, some diets require the individual to eat foodstuffs which contain ingredients believed to benefit him or her (such as the essential fatty acid omega-3)
Other diets require the individual to avoid or reduce foodstuffs which are believed to harm him or her (such as gluten and casein, or yeast).
Dietary supplements are products that are intended to supplement the diet; contain one or more dietary ingredients ; are intended to be taken by mouth as a pill, capsule, tablet, or liquid; and are labelled as being a dietary supplement.
There are numerous different types of supplements including amino acids, botanicals, cofactors, digestive enzymes, essential fatty acids, minerals, prebiotics probiotics and vitamins.
Diets and dietary supplements are sometimes combined with other therapies. For example, some people advocate following a particular diet, taking one or more dietary supplements and using detoxification techniques such as chelation.