The effect of choice-offering on children's vegetable consumption

Vegetable consumption: consumption will be assessed by subtracting the amount of vegetable left on the plate from the pre-weight, measured after the intervention (post-treatment).

1. Liking of the vegetables: the children will make a preference rank order for various vegetables, with the use of three categories (smileys) of liking. This preference rank-order will be performed twice. The first time is before the start of the study at school, in order to select the target vegetables. The second rank-order will be performed at the Restaurant of the Future, after the meal, to assess how the offering of the vegetables influences the pleasantness of the vegetables. We focus on the vegetable that the child ate (choose self versus no choice), but also for the vegetable that the child had seen but was not allowed to eat (choose self versus no choice). Measured before and after the intervention (pre + post- treatment).
2. Perceived choice and autonomy: to be able to check if the children experienced more choice when they were in a choice condition, we will ask the children and their parents a few questions related to choice and autonomy (Based on Intrinsic Motivation Inventory). Measured after the intervention (post-treatment).
3. Intrinsic motivation, reactance and experience of meal context: various questions will be asked to understand the process of reactance, the whole meal experience and children's intrinsic motivation. For the children, these questions will be very simple and concrete, so they can answer them reliably. The answers of the parents may help us understand how the child and his/her parent experienced the situation (Based on Intrinsic Motivation Inventory). Measured after the intervention (post-treatment).
4. Consumption of the other meal components: the consumption of potatoes and meat can influence children's vegetable consumption. Consumption will be measured by weighing before and after the meal. Measured after the intervention (post-treatment).
5. Parental consumption: we will measure parental consumption of potatoes, meat and vegetables as a measure of modelling: do parent and child eat similar portions? Do they finish the same items on the plate? Measured after the intervention (post-treatment).