Eat a balanced diet. Drilled into our brains since preschool, this advice falls squarely in the “duh, everybody knows that” camp. But it’s not just kids who need reminding. Parents and grandparents, as role models and dietary enforcers, do too. Common sense alone tells us this universally applicable dictum is the right way to eat. Different foods have different nutritional and caloric values. If we eat a wide variety of food groups, or as a five-year-old child is taught, “Eat a rainbow,” good nutrition is likely to take care of itself.