We all know that as a nation our mental health is in crisis. But what most don't 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. Psychologist Kimberley Wilson draws on startling new research - as well as her own work in prisons, schools and hospitals around the country - to reveal the role of food and nutrients in brain development and mental health.