I would design the process to first: Allow the customer to feel his or her preferences are accessible and most important. Thus realistic choices. An AI device can do that with tiered options. The base product ordered (IE; hamburger-should have its up-sell option built in) So that the accompanying "side" has options and the client can opt out. Most will not. If given choices of "healthy" or "indulgent", thus not shaming but enhancing the consumptive process.