Roberts' hypothesis is not about the drinking vegetable oil particularly, it's about the link between flavour intensity, calories and weight gain/loss. He was looking for a way to ingest a sudden high calorie, no taste thing. Flavourless vegetable oil is no-flavour/high-calorie - and so is his previous idea of fructose disolved in water.

A useful followup might be "Just try what?"

Suggestions:

A) Whatever it is you want to try, but are putting off

B) Whatever it is you don't want to do and can't do, but feel like you should be able to in order to be a "proper" adult, or a "real" {your job title}, or an ideal human, or whatever.