I don't think that solution makes any sense.

To me, the solution has to be trying to get people to eat healthier things via education. I mean, the "incentive" is feeling good, looking good, being fitter and more capable.

One thing I've found particularly motivating as a parent is that a good diet is a huge competitive advantage for my children. We live on a farm, so we've always got great, healthful things to eat, and since we harvest ingredients and not factory-processed stuff, they're always cooking--it's not just their health now, but their ability to be healthy adults.