Table 2.

Characteristics of measurements used in the present study.

Questionnaire	Objective	Number of Items	Subscales	Internal Reliability: Cronbach’s α
The Polish version of the Three-Factor Eating Questionnaire [39]	Assessment of three different aspects of eating behaviours	18	1. Cognitive restraint-conscious restriction of food intake in order to control body weight or to promote weight loss. 2. Uncontrolled eating-tendency to eat more than usual due to a loss of control over intake accompanied by subjective feelings of hunger. 3. Emotional eating-inability to resist emotional cues, the tendency to eat in response to negative emotions.	Cognitive restraint: α = 0.78 Uncontrolled eating: α = 0.84 Emotional eating: α = 0.86
The Polish version of the Perseverative Thinking Questionnaire [40]	Assessment of repetitive negative thinking from a content-independent perspective	15	1. Core characteristics of repetitive negative thinking: (a) repetitiveness, (b) intrusiveness and (c) difficulties to disengagement. 2. Unproductiveness of repetitive negative thinking. 3. Capturing mental capacity.	Cronbach’s α = 0.64–0.92
The Polish version of the Eating Habits Questionnaire [19]	Assessment of cognitions behaviours and feelings related to an extreme focus on healthy eating, which has been called orthorexia nervosa	21	1. Knowledge of healthy eating. 2. Problems associated with healthy eating. 3. Feeling positively about healthy eating.	Knowledge of healthy eating: α = 0.81 Problems associated with healthy eating: α = 0.82 Feeling positively about healthy eating: α = 0.82