Table 2.

Overview and examples of the methods used in the feedback messages of the FATaintPHAT intervention

Determinant	Methods	Example from FATaintPHAT
Knowledge	• Provide factual information • Multiple-choice knowledge test	Do you know how many sugar cubes there are in a single glass of Coke? There are 4 of them! You have to jog for 15 minutes to burn up this sugar!
Awareness of risk behaviour	• Personal feedback • Normative feedback • Comparison with peers	Your answers show that you are watching television/using the computer for three hours a day. You think that this is not that much, but it is really too much!
Intention to change	• Re-evaluation of intention to change behaviour	Intending to exercise more? You say you haven't really thought about it. But maybe you've changed your mind, knowing that you exercise too little.
Attitude towards behavioural change	• Reinforce existing beliefs • Re-evaluation of beliefs • Present new arguments • Present counterarguments • Dismantle prejudices	Exercising is sweating. And you don't like that. Exercising makes you warm and to loose your warmth you need to sweat. That's very normal. Sweating means you are doing something good and nice! And is sweating really so bad... when you can take a nice shower afterwards?
Perceived behavioural control	• Provide practical tips and tricks • Discussion of difficult situations • Organizing environmental and social support	Choose to eat your fruit at fixed moments of the day, you won't forget it then, e.g.: - In between meals: you can eat fruit instead of candy or cake. - Breakfast: you can put fruit on your bread and with your yoghurt or milk. Think of bananas or strawberries.
Planning	• Formulate implementation intention	Example: What? Eat a piece of fruit instead of a candy bar Where? At school When? During the short break in the morning. Now make your own plan!