The Major "A" allele is associated with:

  • "AA" indicates an increase in ADHD behavior for children when they have been exposed to certain food additives: sunset yellow, carmoisine, tartrazine, ponceau 4R, quinoline yellow, allura red AC and sodium benzoate. (R)
  • It's believed that "AA" increases histamine levels and this is responsible for the ADHD behavior. (R)


Parent Gene: HNMT

Importance: 3
Less common allele: G = 24%
More common allele: A = 76%
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