Hi Martijn! I completely agree about cost-effectiveness analysis. This wasn't part of the original research question, but I am hoping to look into that in a Stage II analysis later this year or early next year, pending funding. That would give even more helpful data to the community.
Regarding the RCT, here is a link to the original resource: Impact of 10 Weeks to Vegan. Something to keep in mind is that the sample was people who were already thinking about veganism somewhat (analogous to the contemplating stage of the TTM: Social & Psychological Barriers to Veganism - Bryant Research). Therefore, we need to keep in mind that certain interventions are more likely to work on individuals at different stages in the pipeline (another research study I'm interested in conducting).
Thanks for commenting!
I'm glad you like this research! Thanks for the comment!