Science also says that fruits and vegetables, not processed with added sugar, are better for your kids’ concentration. See In Defense of Food by Michael Pollan, The China Study by T. Collin Campbell, How Not to Die by Dr. Greger, How to Eat Well and Stay Well the Mediterranean Way by Ancel Key, etc. The argument that “there’s so much evidence that no one can say” isn’t accurate. Epidemiologists use what’s called “the best balance of evidence” when they make these kinds of decisions. That means they weigh the strength of the research on one side versus the strength of the research on the other side. In the case of whole foods, scientists have known for decades that eating plants and vegetables, and not processed foods, is the key to a healthy diet. The book “The Future of Nutrition” by T. Colin Campbell might help you understand why so much bad research contradicts what we’ve known this entire time. Also, just a side note anecdote, this used to just be common sense. Before we had any of this data, parents would refuse to give their kids candy, sodas, and coffees without any evidence at all other than they can see the impact it has on their kids’ behavior with their own eyes.