Participants will not receive the priming manipulation.

Participants will be cueing with health benefits by asking to do a word-search exercise beginning with: "In the following, please choose words/statements that can indicate that having a healthy and sustainable diet can have health benefits, such as..."

Participants will be cueing with environmental benefits by asking to do a word-search exercise beginning with: "In the following, please choose words/statements that can indicate that having a healthy and sustainable diet can have environmental benefits, such as..."

Participants will be cueing with environmental and health co-benefits by asking to do a word-search exercise beginning with: "In the following, please choose words/statements that can indicate that having a healthy and sustainable diet can have both benefits for health and the environment, such as..."

The priming manipulation will be embedded in one computerized experiment to test the effect of three priming interventions on people's emotional reaction and their subsequent sustainable food selection. The priming conditions include priming with health benefits, environment benefits, and co-benefits of having sustainable diets, respectively. The cueing manipulation will be achieved by asking participants to complete a word-search exercise. Brief introduction will be provided to guide participants to choose words/statements that can indicate having a health and sustainable diet can have one of the three benefits: health benefits, environmental benefits or both benefits. The exercise will take ~2 min.

Measure name: Participants' food choice for sustainable food

Measure tool: E-prime

Measure process: During the computerized task, participants will examine a series of food products. Subsequently participants will be directed to simulated webpage for online shopping with all the foods they have examined available and they are required to buy three products they like most with the available budget provided.

Measure units: Participants' actual food choice, whether they prefer choosing more sustainable food.

Measure name: Participants' facial expression measured by pupil diameters

Measure tool: E-prime with Tobii Pro eye trackers

Measure units: Pupil diameters will be used to compare difference when participants view the less or more sustainable foods. The larger pupillary variations is an indicator of interest in the products.

Measure name: Participants' eye movement data

Measure tool: E-prime with Tobii Pro eye trackers

Measure units: Count frequency of looking at the environmentally friendly logo for each food category. Greater number indicates greater degree of attention and interest.

Measure name: Social Orientation Value (SVO)

Measure tool: survey questionnaire

Measure units: Participants will be classified as prosocial, individualistic, or competitive if they made at least six or more choices consistent with one of the orientations.