Calcium Propionate
Calcium propionate is a very commonly used food additive in bread - its primary role is to act as a preservative.
Dengate and Ruben carried out a study with in which some children with behaviour problems were found to have certain conditions worsened by calcium propionate.
The conditions that worsened were:
Irritability
Restlessness
Inattention, and
Sleep disturbance.
Controlled trial of cumulative behavioural effects of a common bread
preservative.
Dengate S, Ruben A.
J Paediatr Child Health 2002;38(4):373-6.