The ultimate problem of systems facilitating long-term health and fitness goals is the disconnect between an action and its eventual consequence. As the long-term effects of behavior change are not immediately apparent, it can be hard to motivate the desired behavior over a long period of time. As such, we introduce a system that uses physical feedback through a wearable device that inflates around the stomach as a response to calorie overconsumption, simulating the long-term weight-gain associated with over-eating. We tested a version of this system with 12 users over a period of 2 days, and found a significant decrease in consumption over a baseline period of the same length, suggesting that through physical response, FatBelt moved calorie intake drastically closer to participants' goals. Interviews with participants indicate that isomorphism to the long-term consequences was a large factor in the system's efficacy. In addition, the wearable, physical feedback was perceived as an extension of the user's body, an effect with great emotional consequences.
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