The casein-free diet is based around elimination or reduction of casein, a protein found in dairy products such as milk, butter and yogurt.
The diet is sometimes combined with a gluten-free diet, which is designed to eliminate gluten (a protein found in cereals such as wheat, oats, rye and barley).
Some people think that the diet can lead to improvements in areas such as IQ, communication and social skills.
This glossary is designed to explain some of the jargon and gobbledygook used by some people when they talk about autism or research..
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The fact that an intervention is listed in this glossary does not necessarily mean that we agree with its use. Nor does it necessarily mean that there is any scientifically valid or reliable evidence behind it.