Characteristics of a nutrient-rich snack typically include a balance of macronutrients such as proteins, healthy fats, and complex carbohydrates. Ideal snacks should be low in added sugars and unhealthy fats while providing essential vitamins and minerals. Foods like nuts, yogurt, fruits, and whole-grain options offer sustained energy and satiety. Additionally, nutrient-dense snacks contribute to overall nutritional requirements and can improve focus and productivity throughout the day, making them beneficial for maintaining a healthy lifestyle.