Any would actually work. Like fruits, and veggies.
A nudge, as we will use the term, is any aspect of the choice architecture that alters people's behavior in a predictable way without forbidding any options or significantly changing their economic incentives. ... In this form, drawing on behavioral economics, the nudge is more generally applied to influence behaviour.
If revealing your piercings during travel is unacceptable, wear nonmetallic jewelry. Quality metal body jewelry is non-ferromagnetic and will not set off the large walk-through metal detectors. ... You can still wear your metal piercing jewelry when you travel, and the TSA will not ask you to remove them.