Sign up for a full digest of all the best opinions of the week in our Voices Dispatches email Sign up to our free weekly Voices newsletter Please enter a valid email address SIGN UP I would like to be emailed about offers, events and updates from The Independent. A healthy, balanced diet is linked to better brain health, and better mental wellbeing, new research suggests. The study sheds light on how food preferences influence physical health, but also significantly impact on brain health.