My kids are gluten intolerant. There are so many options for this now! Gluten causes my youngest ADHD symptoms, constipation, and insomnia. Going gluten free has changed her life for the better. It took a few weeks to notice the change in her, and now she doesn't even want gluten because she feels so much better.
I don't notice a big difference in my older daughter, but maybe her anxiety is better and she does sleep better