Most of us have a harder time regulating our response to emotion when our bodies are stressed. People with untreated ADHD can experience bodily stress due to the brain not doing its job in sorting through, filtering and/or prioritizing what stimuli needs attention. The brain/body experiencing sensory input - every sight, sound, taste, touch, smell and thought - as equally important tends to live close to the threshold of tolerance most of the time. Some people with ADHD find that they regulate well enough when they are well-fed and well-rested, because the baseline stress level is not too high to manage. Trauma resolution can also help reduce the baseline stress level, and so can mindfulness training that helps all people manager their response to sensory experience. Even when trained or receiving other supports, though, people with ADHD do well to avoid unnecessary input - so as not to tire out the system - if they want to maximize emotional regulation.