In What If Doctors Could Finally Prescribe Behavior Change? Sean Duffy explains why behavior change is so difficult, particularly in healthcare:

Whether it’s for weight loss, smoking cessation, diabetes, or otherwise, the best research shows that meaningful behavior change outcomes require not just guidance from a trusted health professional, but also positive social support, easy-to-digest insights about their condition, a carefully orchestrated timeline, and a process that follows validated behavioral science protocols. That’s hard to squeeze into a phone call. Or a doctor’s visit, for that matter.

The good news is that this research is resulting in a new field called Digital Therapeutics, and despite quite a bit of snake oil out there, some apps are having success:

Another example is Jenna Tregarthen, a PhD candidate in clinical psychology and eating disorder specialist. She rallied a team of engineers, entrepreneurs, and fellow psychologists to develop Recovery Record, a digital therapy that helps patients gain control over their eating disorder by enabling them to self-monitor for destructive thoughts or actions, follow meal plans, achieve behavior goals, and message a therapist instantly when they need support.