It could all be biochemical

Around 10 per cent of all children in the UK and the USA are labeled with some learning difficulty, such as ADHD or dyslexia. But it may not be 'something they're born with' - it could be caused by a transitory biochemical reaction to a food or chemical intolerance.
This theory, explained in the latest issue of What Doctors Don't Tell You newsletter, means that learning difficulties need not be a life sentence, but could be just a temporary problem once the allergy or intolerance is identified and avoided.