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doi: 10.1016/j.cct.2017.05.008

doi:10.1016/S0014-2999(03)02149-6

We systematically updated evidence on the effectiveness of a gluten-free and casein-free (GFCF) diet as a treatment for ASD in children

Symptoms of histamine intolerance vary from person to person, but some common symptoms associated with low DAO levels include: Skin symptoms: itching, hives, redness, eczema, or flushing Gastrointestinal symptoms: bloating, abdominal pain, diarrhea, gas, or nausea Respiratory symptoms: nasal congestion, sneezing, runny nose, or difficulty breathing Cardiovascular symptoms: irregular heartbeat, palpitations, or low blood pressure Neurological symptoms: headaches, migraines, dizziness, or fatigue Psychological symptoms: anxiety, irritability, or insomnia It's important to note that these symptoms can be caused by various factors and not just histamine intolerance or low DAO levels