Although diet can influence mental health and cognitive function, evidence of benefit for many specific diets is actually quite weak, a new review suggests.

In the “most up-to-date overview of the new field of nutritional psychiatry,” investigators with the Nutrition Network of the European College of Neuropsychopharmacology (ECNP) found strong evidence that following a ketogenic diet of high fat and low carbohydrates may reduce seizures in children with epilepsy. They also confirmed that the Mediterranean diet guards against depression and anxiety.
In addition, there is a strong link between vitamin B12 deficiency and an increased risk of fatigue, depression, and memory problems.However, evidence of any efficacy of vitamin D supplements or any nutrient in mitigating symptoms of autism or attention deficit hyperactivity disorder (ADHD) is “inconclusive,” the researchers note.