Why couldn't I be nudged to dislike a Big Mac?

The central distinction in Yashar Saghai’s thought-provoking article is between nudges and (behavioural) prods. What distinguishes a prod from a nudge is that a prod is ‘substantially controlling’ (SC-ing) whereas a nudge is ‘substantially noncontrolling’ (SNC-ing). This has moral relevance in so far that a nudge but not a prod preserves freedom of choice.