A new school year brings new routines, new schedules and new demands on children's brains and bodies.
Nutrition plays an important role in supporting the cognitive processes children rely on every day: attention, memory, problem-solving and emotional regulation.
While no single food can improve grades overnight, decades of nutrition research show that consistent eating patterns, adequate nutrient intake, and balanced meals can influence children's ability to learn and participate in school.
Our RxFood dietitians reviewed the evidence behind some of the most common back-to-school nutrition questions.
1. Does breakfast actually affect learning?
The science: Yes, breakfast is associated with measurable differences in attention and cognitive performance.
After an overnight fast, the brain relies on glucose to support normal function. Children who skip breakfast may experience changes in attention, memory, and energy availability during the school day.
A systematic review published in Advances in Nutrition analyzed 45 studies examining breakfast and cognition in children and adolescents. Researchers found that breakfast consumption was associated with improvements in several areas of cognitive performance, particularly attention and memory-related tasks. (PubMed)
What this means for parents:
A balanced breakfast does not need to be complicated.
Aim for a combination of:
Protein + Fibre + Healthy Fat
Examples:
Greek yogurt with berries and oats
Whole grain toast with eggs
Overnight oats with nuts or seeds
Smoothie with milk, fruit and nut butter
2. Why does a balanced lunch matter for the afternoon slump?
The science: Meal composition influences energy availability, satiety, and overall diet quality.
Children have high nutrient needs to support growth and development. Meals that combine protein, fibre-rich carbohydrates and colourful plant foods provide a wider range of essential nutrients and help support sustained energy throughout the day.
Research examining children's diets has found associations between healthier dietary patterns and academic outcomes. A systematic review in the Journal of Human Nutrition and Dietetics found that higher-quality diets were generally associated with better academic achievement, although researchers noted that more longitudinal research is needed. (Burrows et al., 2017)
What this means for parents:
Instead of focusing on individual "superfoods," build balanced meals.
Try:
1/2 plate: vegetables and fruit
1/4 plate: protein
1/4 plate: whole grains or other high-fibre carbohydrates
Examples:
Chicken and vegetable wrap
Lentil soup with whole grain bread
Salmon rice bowl
Hummus, pita and vegetables
3. Is protein important for kids during the school day?
The science: Protein supports growth, development and meal satisfaction.
Protein provides amino acids required for tissue growth, immune function, and many biological processes. Including protein throughout the day can help children meet their nutritional needs and create more balanced meals.
Research on childhood nutrition consistently supports adequate protein intake as part of a healthy dietary pattern, particularly during periods of growth.
Practical examples:
Add protein to:
Breakfast:
Eggs
Yogurt
Milk
Lunch:
Chicken
Beans
Lentils
Tofu
Cheese
Snacks:
Nut or seed butter
Yogurt
Cheese
4. What role does hydration play in concentration?
The science: Hydration status may influence cognitive performance.
Children can be more vulnerable to dehydration because they have different fluid regulation needs compared with adults.
A systematic review examining hydration and cognitive performance in children found that fluid intake interventions may improve performance on some cognitive tasks, although researchers noted that more high-quality studies are needed. (IFP)
What this means for parents:
Make water accessible.
Simple habits:
Pack a reusable water bottle
Encourage drinking with meals and snacks
Offer water regularly throughout the day
5. Should parents worry about making the "perfect" lunch?
The science: Consistency matters more than individual meals.
Nutrition research looks at overall dietary patterns because children's health is shaped by what they eat repeatedly over time.
A lunchbox does not need to be perfect every day.
Some days might include leftovers.
Some days might include a sandwich.
Some days might include a favourite snack.
The goal is to help children consistently get the nutrients they need to grow, learn, and feel their best.
The RxFood Dietitian Takeaway
The best back-to-school nutrition habits are the ones families can maintain:
✓ Eat breakfast regularly
✓ Include protein and fibre at meals
✓ Add fruits and vegetables where possible
✓ Keep water available
✓ Involve children in food choices
Nutrition is just one part of children's overall health, but it is something parents can support every day.
At RxFood, our clinicians use evidence-based nutrition science to help people understand how food impacts health, one meal at a time.
References
Adolphus, K., Lawton, C. L., Champ, C. L., & Dye, L. (2016). The Effects of Breakfast and Breakfast Composition on Cognition in Children and Adolescents: A Systematic Review. Advances in Nutrition, 7(3), 590S–612S. https://doi.org/10.3945/an.115.010256
Burrows, T., Goldman, S., Pursey, K., & Lim, R. (2017). Is there an association between dietary intake and academic achievement: A systematic review. Journal of Human Nutrition and Dietetics, 30(2), 117–140.
D'Anci, K. E., Constant, F., & Rosenberg, I. H. (2006). Hydration and cognitive function in children. Nutrition Reviews, 64(10), 457–464.
This article is for informational purposes only and does not constitute medical advice.