 Some studies suggest that in a minority of children , artificial food dyes or preservative may be associated with an increased prevalence of ADHD or ADHD @-@ like symptoms but the evidence is weak and may only apply to children with food sensitivities . The United Kingdom and the European Union have put in place regulatory measures based on these concerns . In a minority of children , intolerances or allergies to certain foods may worsen ADHD symptoms . 
