Processed foods increase hyperactivity in children, and the effects can linger for years. For parents who want to dive deeper, see the study below. 

Quote from the study:

“The consumption of ultra-processed foods at an early age was associated with hyperactivity and inattention symptoms in adolescence.”

In this study, they found that the amount of ultra-processed food that infants consumed at age 12-16 months correlated with an increased amount of hyperactivity symptoms at age 12-13. 

https://pmc.ncbi.nlm.nih.gov/articles/PMC11548911/#:~:text=Among%20the%20173%20adolescents%2C%2022.5,and%20inattention%20symptoms%20in%20adolescence.