Final answer:
Discussing whether Dave or Jillian is more likely to deviate from vegetarianism involves understanding their motivations—Dave's ethical stance and Jillian's health experience. The answer cannot be definitively determined as individual behaviors and convictions differ, even if Dave's moral reasons may suggest a stronger commitment to vegetarianism.
Step-by-step explanation:
The question whether it is more likely that Dave will "cheat" and eat a hamburger occasionally than Jillian is a complex one that involves factors including individual philosophy and habit formation. Given that Dave's commitment to vegetarianism is based on moral reasons, and assuming strong adherence to his ethical beliefs, it might be less likely that he would "cheat" compared to someone whose vegetarianism is based solely on a bad past experience like Jillian. However, the reality is individual and can vary greatly based on personal convictions and circumstances.
The studies and opinions mentioned in the provided information imply that there could be a significant amount of pleasure derived from consuming meat, and that dietary habits can be deeply entrenched, but also that there are people whose philosophical views lead them to strictly avoid animal products, not just for health or environmental reasons, but out of a principle to eliminate animal husbandry entirely.