The natural therapy advice for helping those with ADHD and other impulsive behaviour disorders such as bipolar and schizophrenia has long been centred on optimising levels of vitamin D and increasing intake of omega-3 essential fats found in oily fish and nuts and seeds. A new paper from experts in the US has recently suggested a clear theory of why this approach is so beneficial, namely that both these nutrients support serotonin in the brain.The authors highlight optimal vitamin D and omega-3 fats are both essential for making brain serotonin, the chemical responsible for maintaining mood balance. They suggest low vitamin D and omega-3 fats coupled with genetic factors during key stages of development may lead to disrupted serotonin production and function, such that disorders like ADHD can result. So a daily dose of the sun, to up vitamin D levels followed by a tasty fish dinner, may be a great way to help improve daily symptoms.