The digital health app market is expected to grow from $4.2 billion in 2020 to $20.7 billion in 2027.

Even with all that growth, many health apps aren't effective at creating positive outcomes in the lives of people. Some apps are predicated on the idea that human behavior takes 21 days to change. That is an unrealistic time frame.

Truth is, the time it may take for a person to form a habit is highly personal, and it can range anywhere from 18 to 254 days depending on many factors, according to one study.

In this episode, we chat with Macadamian’s Cognitive Behavior Scientist, Roxana Barbu, about what you should consider when creating a successful digital-health app.