We all know that as a nation our mental health is in crisis. But what most dont know is that a critical ingredient in this debate, and a crucial part of the solution - what we eat - is being ignored.Nutrition has more influence on what we feel, who we become and how we behave than we could ever have imagined. It affects everything from our decision-making to aggression and violence. Yet mental health disorders are overwhelmingly treated as mind problems as if the physical brain - and how we feed it - is irrelevant. Someone suffering from depression is more likely to be asked about their relationship with their mother than their relationship with food.