Table 1.

Some illustrative items of the Questionnaire

TPB constructs	Questions	Scale
Knowledge	Which of the following diseases is created with overweight and obesity?	True /False
Attitudes	Weight loss decreases the risk of cardiovascular disease, for me. Prevention of cardiovascular disease …	Absolutely agree to Absolutely disagree It is very important to It is not very important
Subjective norms	My parents regularly encourage me for weight loss. What is the opinion of parent’s importance for my weight loss?	Absolutely agree to Absolutely disagree Much frequently to Never
PBC	The use of low-caloric diet for weight loss is difficult for me.	Absolutely agree to Absolutely disagree
Intention	I intend to get regular physical activity in free time for weight loss.	Absolutely agree to Absolutely disagree
Behavior	Do you have fruits and vegetables 2 or 3 time each day?	Never, Rarely, Sometimes, Frequently, Always

TPB: The theory of planned behavior

PBC: Perceived behavioral control