The quality of your food affects how your brain and body work. Try to eat high-quality food, and be careful with calories. Impulsivity leads many people diagnosed with ADHD to eat the wrong things too often. In fact, impulsivity is associated with unhealthy weight gain, which has been shown to be bad for the brain. Eat only high-quality calories. One cinnamon roll contains 720 calories and a small quiche more than 1,000 calories while a 400-calorie salad made of spinach, salmon, blueberries, apples, walnuts, and red bell peppers will increase your energy and, maybe, make you smarter.
One easy trick if you're a pasta fan is to swap out white pasta for the wonderfully named courgetti (spaghetti made from spiralizing courgette). You’ll hardly notice the difference when you’re eating it, but you’ll be fuller for longer despite consuming fewer calories. When you consume fewer calories, your body can go to your fat reserves for energy, rather than just burning off the food you’ve eaten.  
The theory behind the diet is not the reason you will lose weight if you follow this plan. Weight loss can only occur when you consume fewer calories than your body needs. In the introduction chapter the author makes numerous claims that you do not need to limit the quantity of food that you consume and then provides portion restrictions on many high calorie foods, such as nuts. It's appealing to hear you can eat unlimited quantities, but weight loss will not be achieved without limitations.
‘Did you know that gluten makes some people emotionally unstable? There are reports of people having psychotic episodes when they’re exposed to gluten.’ Where is the reference? If this is anecdotal that should be made clear in the text. The article is littered with claims that appear to be anecdotal, yet is written as if these statements were fact. They may well be, but without robust randomised and controlled studies to back the author’s claims it’s really just a suspicion based on anecdotal evidence. If I’m going to risk developing disordered eating by following a ‘strict elimination diet’ I want to see facts not anecdotal evidence. Not impressed, ADDitude!
"When going out for fast food, I used to get the large-size value meal. Now, I satisfy a craving by ordering just one item: a small order of fries or a six-piece box of chicken nuggets. So far, I've shaved off 16 pounds in seven weeks, and I'm on track to being thinner than my high school self for my 10-year reunion later this year." —Miranda Jarrell, Birmingham, AL