Here are a series of videos and articles that might be useful.

Dr. Bob DeMaria on how ADHD is made worse or even created by trans fats, french fries, and Skittles.

Some experts claim that sugar is as addictive as harder drugs.  It inflames the whole body, including the brain.  This can create brain fog and other mental issues.
Dr. Axe on how to overcome the sugar cravings.