This reply was originally posted by user adhdmomma in ADDitude’s now-retired community.
Research has not proven a link between sugar and behavior. https://www.additudemag.com/adhd/article/859.html
However, a healthy lifestyle is always beneficial, so I definitely agree that reducing sugar intake is ideal.
What is most important in a diet for individuals with ADHD is a good amount of protein, and maintaining a fairly level blood sugar (complex carbs paired with protein). This prevents spikes in energy and crashes: https://www.additudemag.com/adhd/article/9136-2.html.
ADDconnect Moderator, Author on Parenting ADHD, Mom to teen boy with ADHD, LDs, and autism