The relationship between what we eat and how we learn is much closer than it may seem. During childhood and adolescence, a balanced diet not only supports physical growth, but also influences attention, memory, motivation and mood. That is why, when we talk about the influence of diet on academic performance, we are not referring simply to “eating well”, but to building a strong foundation so that pupils can face the school day with energy, balance and concentrating.

At demanding educational stages such as Primary and Secondary education, maintaining healthy eating habits can make a real difference in everyday life. From breakfast to an afternoon snack, every meal plays an important role in development and learning.

Correlation between nutrition and academic performance: How is it influenced?

The brain needs quality nutrients to function properly, and when it receives them, it performs better in different areas.

It improves mood

Diet also affects emotional wellbeing. A child or teenager who follows a balanced diet is often more emotionally stable, which is essential for functioning well in the school environment. Nutrients such as healthy fats, as well as certain vitamins and minerals, play a part in processes linked to emotional wellbeing.

When the diet is adequate, it becomes easier to maintain a positive attitude towards schoolwork, relate well to others and cope better with the small daily challenges of learning. By contrast, a poor or disorganised diet can contribute to irritability, tiredness and a lack of motivation.

It improves concentration and memory

One of the clearest aspects of the relationship between diet and school performance is its impact on attention span. The brain needs a constant supply of energy and nutrients in order to process information, retain concepts and solve problems.

For this reason, a balanced diet helps to maintain better concentration in class and supports both short-term and long-term memory.

It provides sustained energy

Not all foods provide energy in the same way. Products that are high in simple sugars can create quick bursts of energy, but they can also lead to sudden drops that affect performance and attention levels. By contrast, foods containing complex carbohydrates, protein and healthy fats allow energy to be released more steadily throughout the day.

It prevents health problems

Diet also has a preventive role. Maintaining healthy habits helps to reduce the risk of certain nutritional deficiencies and problems that may affect a pupil’s general wellbeing, such as frequent tiredness, weakness or digestive discomfort.

How does poor nutrition affect academic performance?

An inadequate diet can clearly have a negative effect on academic performance. A lack of variety, excessive consumption of ultra-processed foods or irregular meal times can have visible consequences both at school and at home.

Behavioural problems

A poor diet can influence behaviour in children and teenagers. When nutritional needs are not properly met, or when low-quality foods dominate the diet, irritability, sudden mood changes or a lower tolerance for frustration may appear.

This not only affects family life, but also the classroom environment, where coexistence, self-regulation and the ability to follow routines are essential for educational development.

Difficulty concentrating

Skipping meals, consuming too many sugary products or following an unbalanced diet can lead to tiredness and poor attention. One of the most common effects of an inadequate diet is precisely difficulty concentrating for long periods. As a result, the pupil may find it harder to follow explanations, organise ideas, complete tasks or remember important information.

Delayed cognitive and physical growth

During childhood and adolescence, the body is developing rapidly. An insufficient or unbalanced diet can affect both physical growth and cognitive development. The brain needs specific nutrients in order to mature properly, and the body requires energy and building blocks in order to grow.

Diet and academic performance: what foods should you eat?

To support a positive academic performance through diet, it is advisable to prioritise fresh, varied and nutritious foods within a structured routine. Some recommended options include:

  • Fruit and vegetables every day, for their supply of vitamins, minerals and fibre.
  • Whole grains, oats, rice or wholemeal bread, which provide sustained energy.
  • Pulses, eggs, fish and lean meats, important because of their protein content.
  • Nuts and olive oil, which are sources of healthy fats.
  • Dairy products or equivalent alternatives, depending on each child’s needs.

Hydration should not be overlooked either. Drinking enough water throughout the day also supports concentration and general wellbeing. Likewise, keeping regular meal times helps both the body and the brain to function more steadily.

And what foods are best to avoid?

Rather than speaking in terms of absolute bans, it is better to limit those products whose frequent consumption may undermine healthy habits. These include:

  • Industrial pastries.
  • Sugary soft drinks.
  • Ultra-processed snacks.
  • Products high in salt or sugar.

When consumed occasionally, they do not necessarily pose a problem, but when they replace more nutritious foods, they can affect energy levels, concentration and general health.