Nutrition is the main component of children's health. In order to be completely healthy children need good nutrition and substantial physical activity [1]. Nutritional habits acquired in childhood and adolescence are maintained during adulthood. Scientists emphasize breakfast eating because breakfast ensures attention-concentration, memory and school achievements during morning sessions [2]. Eating breakfast provides energy for the brain and improves learning. Poor nutrition is associated with

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... oor academic achievements. Under-nutrition has negative effect on pupils' behaviour, attendance of lessons and even behaviour in adulthood [3]. Nutrition of pupils should be well-balanced and variable, offering more fresh fruit, whole grains and a greater variety of vegetables [4]. It is recommended to reduce levels of fat and sodium and increase fiber [5], and in the first part of day to drink more fresh water in order to improve attention and behaviour [2]. The aim was establish the interrelationship between nutrition, behaviour and academic achievements in pupils. Conclusions. Breakfast is an essential meal in pupils' day; regular habit of eating breakfast has beneficial influence on attentionconcentration, memory and school achievements. Well-balanced pupils' nutrition decreases antisocial and aggressive behaviour. Physical activity reduces manifestation of negative emotions and stress in pupils.Keywords: physical activity, nutrition, behaviour, academic achievements.