The purpose of the thesis is to evaluate the mobile app for monitoring dietary intake and nutrition and to determine if it provides support in the regulation of body composition, changes in eating habits, perception of a balanced diet, and motivation to exercise. We investigated the differences of BMI, ΔBM, FTI, LTI, and differences in energy intake, fats, carbohydrates, protein, dietary fiber, and a few vitamins and minerals between the group with an app (group A) and the group without an app (group B). The results are based on a three-month study and measurements of eighteen subjects (25 - 55 years, BMI > 25). On average group A lowered energy intake by 182 ± 516 kcal and fat intake by 2 ± 21 g/day, increased carbohydrate intake by 6.1 ± 71 g/day, dietary fiber by 1.4 ± 9.2 g/day, and protein by 7.5 ± 27 g/day. Group B lowered energy intake by 158 ± 533 kcal, fat intake by 9.1 ± 21 g/day, carbohydrate intake by 21.1 ± 75 g/day and increased dietary fiber intake by 0.4 ± 9.9 g/day and protein intake by 1.0 ± 34 g/day. For other nutrients, including vitamins and minerals, no significant differences between the groups were observed. In a group A BMI decreased by 1.5 ± 1.3 kg/m2 and in group B by 1.7 ± 1.4 kg/m2. Group A lost a higher proportion of body weight (8.6 ± 12.5 %) than group B (5.7 ± 3.7 %), although no statistically significant difference was observed, the same in FTI, LTI, knowledge of a balanced diet, participation in exercise and results in functional tests. We found that using an app during an intervention is not a more effective tool for changing eating habits, compared to an intervention without an app. We conclude that to effectively change the lifestyle for the better, the essential thing is simultaneous education on a balanced diet, regular monitoring of diet and physical activity under professional guidance. Only after gaining knowledge, we assume that recommending a mobile app could be relevant.
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