Food & Ingredients
4 min read
The BBB diet in autism – rationale for excluding gluten, casein, and simple sugars
Tim Klein
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Diets Premium Expert • 24.09.2026
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Scientifically reviewed by a clinical dietitian:
This article has been peer-reviewed for adherence to IŻŻ, WHO, and PTGiP clinical nutritional standards.
| Diets Premium Expert Tim Klein | min read 4 min | Scientifically reviewed by a clinical dietitian 24.09.2026 |
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Key Takeaways
The BBB diet, used as a supportive therapy for children with autism, excludes gluten, casein, and simple and disaccharide sugars from the diet. Its effectiveness is supported by research indicating that individuals with autism often suffer from increased intestinal permeability, which can be alleviated through appropriate dietary adjustments.
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Autism and Nutrition – Dietary Therapy Overview
For children on the autism spectrum, a milk-free, gluten-free and sugar-free diet is recommended for therapeutic and medicinal purposes. Most children with this condition also have problems with the digestive system, in particular with a disease known as liquefying gut. It is a condition that involves the formation of gaps in the uniform structure of the intestinal wall. However, by not passing directly into the bloodstream, most of the particles of substances that should be strongly distributed or excreted from the body. Additionally, it has been observed among children to have a strict metabolism of lymphocytic tissue, a lack of metabolism on the side of the stomach, as well as a reduction of dietary allergies and allergies.
Autism and Gluten – The Gut-Brain Connection
Gluten is a plant-derived protein compound made from a combination of two proteins: gliadin and glutenin, and its source are the so-called gluten compounds, i.e. wheat, rye, oats, barley. It is one of the highly allergic substances, causing inflammation and malfunction of the small intestine, which leads to the degradation of the intestinal microcosms that build up the wall of the large intestine and allow food to be absorbed into the bloodstream.
Autism and Casein – Impact on Gut Microbiome
Casein is the most important protein found in milk, accounting for about 75% of all proteins found in cow's milk and about 40% in female milk, and is recognized as the cause of 60% allergy to dairy products. Adverse symptoms seen in people who do not tolerate casein include diarrhea, stomach pain and vomiting. These conditions also adversely affect the bacterial flora of the gut by depleting the preferred microflora.
Clinical Rationale for Eliminating Gluten and Casein
Given that both gluten and casein are highly allergenic substances whose action has a beneficial effect on the development of hyperintestinal disease, it can be concluded that elimination of these substances will have a positive impact on the patient's condition. There is an informal hypothesis that during incomplete metabolism of casein and gluten by the body, substances with a similar action to opioids are produced.
Autism and Sugar Elimination
Additionally, the diet of children with autism indicates that some simple sugars and sugars are discarded as easily and quickly absorbed by the mucous membranes of the digestive system. Sugar is a nutrient for the Candidia albicans fungus, whose development is accompanied by the production of toxins that cause the disorders typical of autism and deepen the development of the disease. In addition, plain sugars or sugars that are easily and rapidly absorbed through the mucosal membrane of the gastrointestinal tract cause the activity of undesirable symptoms in children with the autism spectrum.
mgr Tim Klein
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