1) A study surveyed 20 high school students about their eating habits, hydration levels, and academic performance. It found that students who skipped breakfast, drank less water, and ate junk food like pizza and fries reported lower GPAs and more tiredness. 2) A separate study that fed children either junk food or healthy food for 3-4 years found the junk food group did worse in school and had trouble learning. 3) The researchers concluded that nutritional choices can impact academic performance, and recommended eating breakfast, staying hydrated, and choosing healthy snacks to improve grades.