Students will have a Diary where they describe: 1. what they have for breakfast, lunch, snack and dinner during a week. Photos will be taken, receipts written about the meals; 2. write down calories they have from meals each day; 3. What physical they do to burn calories (using Endomondo, watches to measure the distance, calories etc). 4. A comparative presentation about the results of having meals, doing activities, using calories.