Healthy school lunch provides sound nutrition to establish a lifetime of healthy habits and the energy your child needs for the rest of her busy day. If you want to do your best to get good grades, a healthy diet can improve your performance in a school's social, physical and mental areas. Getting adequate protein, vitamins, and minerals from food can keep you from taking sick days and missing out on daily lessons. Healthy eating has been linked to higher grades, better memory, more alertness, faster information processing and improved health leading to better school attendance.