Health apps are about as effective as public health ads:

Just as I see an ad when I get on the subway telling me that this soft drink has 40 packets of sugar, I whip out my iPhone and see the Livestrong app on my homescreen on my iPhone reminding me that I need to eat well. I don’t really want to use the Livestrong app because it’s just such a drag. It’s cumbersome and a reminder that there’s this big downer in my life that I want to change. And there’s a 95% chance I won’t use it a month after downloading it. But I see it every day on my home screen. Therefore, this app may be about as effective as a subway ad telling me to stop drinking 40 packets of sugar in that Starbucks Trenta.

from my post over at my company’s site, The Future Well.