Before I knew my son (now age 8) had ADHD I noticed how sugar affected him dramatically — and he was only 2 years old at the time. Fast forward to age 6 and we eliminated dairy and gluten from his diet and saw a dramatic difference in irritability and mood instability in eight days. EIGHT DAYS! He’s been gluten- and dairy-free for 19 months now and we can tell almost immediately when he’s eaten dairy or gluten — his behaviors are through the roof for about 3 days. There’s definitely something to it for some people. Science hasn’t made a connection between diet and conditions like ADHD and ASD, but anecdotally I know one exists for some people, but clearly not all.