Data analysis
All analyses were performed using Stata 15.1. Significance was set to 5% (α = 0.05). Descriptive statistics – means and standard deviations (SD) or numbers of participants (Analyses of the intervention effect were performed using an intention-to-treat approach. Within group differences (i.e., differences within the intervention and control group separately) were determined by conducting t-tests between participant diet-related GHGEs at baseline and 3m follow up. The absolute change in daily diet-related GHGEs from baseline to 3m follow up was calculated for each participant by subtracting the baseline value from the 3m follow up value. A box-and-whisker plot was generated to depict the spread of change in daily diet-related GHGEs, by intervention group. The between group difference was determined by conducting a t-test between the mean change in daily diet-related GHGEs of both groups. To determine if any specific changes were made to the diet, FFQ item categories were analysed. The mean diet-related GHGEs for each FFQ item category at baseline and 3m follow up was determined for both groups and presented in a bar graph. Differences in mean GHGEs for each FFQ item category were determined by conducting t-tests between baseline and 3m follow up values, for the intervention and control group.