While I agree that most people will find it "unneeded friction" to record the start and end of food ingestion, I can definitely imagine some third-party developers who might want to develop very detailed food-logging apps that include this information. (I would even experiment with tracking this kind of info for short periods of time to "audit" my bolus usage.) The question is should we allow for this model in our main data model or expect such users to define a completely separate food event as a `grabbag`?