A Dietitian’s Realistic Guide to Fueling Kids for the School Day

A rushed morning and a bowl of sugary cereal might get a kid out the door on time, but it may not get them through first period focused and ready to learn. Lucette Talamas, M.S., RD, LDN, a registered dietitian with Baptist Health South Florida, says what a student eats, and how consistently they eat it, plays a real role in concentration, energy and mood throughout the school day.

We spoke with Talamas about what’s happening in a child’s brain when they skip breakfast or load up on refined carbs, how blood sugar dips can derail an afternoon class or test, and what realistic, low-effort breakfast options look like for families who don’t have time to cook from scratch every morning.

What’s happening in the brain when a student eats a nutrient-poor breakfast versus one that supports focus and energy?

Lucette Talamas, M.S., RD, LDN: The brain needs a steady supply of energy (via calories) and nutrients to support focus and learning. When a child skips breakfast, their brain does not get any fuel to function at its best. It’s like a car running on empty. While the body has mechanisms to compensate, it is best for a child to eat breakfast to start their day with energy.

If a child has a nutrient-poor breakfast, such as one that is mostly refined carbohydrates and added sugars, they will get quick energy, but it will likely not keep them satisfied or energized for very long.

A balanced breakfast, one that includes fiber-rich carbs, protein and healthy fats, will provide sustained energy to help a child stay satisfied and focused throughout their morning.

Are there specific foods or eating patterns that tend to help students concentrate during class, and others that work against them?

LT: When it comes to concentration, it is less about one specific food and more about giving the brain and body the fuel it needs consistently through meals and snacks. Meal and snack patterns vary according to the child’s age. Young children need about three meals and two snacks per day, while older children may be OK with three meals and zero to two snacks per day, depending on their physical activity levels.

Besides starting their day with breakfast and also having lunch, looking at pairing ideal foods will provide long-lasting energy to help kids concentrate during class. Meals and snacks that combine healthy fats and protein with fiber-rich carbohydrates will provide more lasting energy and fullness.

For example, instead of just cereal, add Greek yogurt, fruit and cereal as a topping. Instead of just an apple, pair it with nut butter or a piece of cheese. Or instead of just pretzels, aim for a trail mix that includes pretzels, nuts and dried fruit.

How does blood sugar fluctuation throughout the school day affect a kid’s ability to stay focused, especially heading into an afternoon class or a test?

LT: The brain relies on glucose for energy to think and concentrate, so having adequate and consistent carbohydrates throughout the day is important. When a student goes many hours without eating, or eats a meal that doesn’t provide enough calories and/or carbohydrates, they may experience hunger, fatigue, difficulty concentrating or irritability. While there are other factors that may cause some of these symptoms or lack of concentration, a child’s diet and nutrition is an important factor to consider.

Regularly scheduled balanced meals and snacks can be helpful during a long school day. While we discussed the importance of breakfast, lunch is equally important as an opportunity to have energy for the afternoon classes. The same formula applies for breakfast and lunch: Aim for fiber-rich carbohydrates, protein and healthy fats.

For a busy family with a rushed morning routine, what are realistic, low-effort ways to set a kid up nutritionally before school?

LT: Breakfast doesn’t have to be elaborate. Aim for realistic, not perfection. Also, certain processed or preprepared foods (not ultraprocessed) will be helpful in saving time.

Some easy options are:

• Greek yogurt (plain, sugar-free or low added sugar), fruit and whole-grain cereal (low added sugar)
• Whole-grain toast, peanut or other nut/seed butter, and banana
• Hard-boiled egg, fruit and whole-grain toast
• Overnight oats prepared the night before: oats, milk of choice, nuts/seeds/nut butter, cinnamon and a dash of honey
• A smoothie made with milk or Greek yogurt, fruit and nut/seed butter
• Frozen whole-grain protein waffles, or regular, then add a protein source like nut butter

If mornings are chaotic, prepare breakfast foods the night before. Having a few grab-and-go options available can make a much bigger difference than trying to create a perfect breakfast from scratch every morning. Prep that can be done ahead of time includes boiling a batch of eggs, making overnight oats, and rinsing and slicing fruit.

Lastly, if you need a break, see if your child’s school serves breakfast and plan to arrive on time for your child to participate.

Is there a meaningful difference between how nutrition affects younger kids versus teenagers when it comes to focus and academic performance?

LT: The basic principles are similar at every age: Children of all ages need scheduled, balanced meals and snacks, adequate overall nutrition focusing on iron, calcium, vitamin D, fiber, hydration, and choosing a variety of nutrient-dense foods throughout the week.

Nutrition and calorie demands increase as children get older and enter puberty. It’s also important for their energy intake to meet the demands of sports or physical activity they are involved in.

Younger children have smaller stomachs and may need more frequent meals and snacks. Teenagers go through significant physical growth and may have higher energy and nutrient needs during this time, which also requires meal and snack planning. As teens establish their independence, they can also assume more responsibility over their meal and snack choices in a positive way. They can be more involved in meal planning, food prepping and cooking if provided the support and practical tools. As they grow, conversations can focus on how they feel after eating certain foods versus how they feel when eating healthier, balanced foods. The goal is not to create “good” and “bad” food lists, but to understand how food impacts their body, mind, and school and sport performance, all while building a healthy relationship with food. What they ate overall in the day is more important than one singular food. It’s OK to enjoy that pizza or ice cream.

The good news: Raising a healthy eater is a time investment in a child’s early years that will pay off into their teenage years. Overall, the goal is to raise a healthy eater who understands the foundation of proper nutrition’s impact on their body and mind in order to feel energized throughout their school day to achieve academic performance and physical performance in their sport or after-school curricular activities.