Our diet affects how our brains function and some foods and food intolerance can cause mood swings and challenging behaviour in children.  It is worth noting the impact of certain foods on behaviour and mood and making sure that your child is eating a balanced diet.  

https://www.gosh.nhs.uk/conditions-and-treatments/general-health-advice/food-and-diet/

There is more information about balanced diets here

eight tips for healthy eating