Users who continually find value in a product are more likely to tell their friends about it.

Products with higher user engagement have the potential to grow faster than their rivals.

You'll often find that people's declared preferences - what they say they want - are far different from their revealed preferences - what they actually do.

As fleeting commitments, diets often fail. Thinking of dietary choices as part of who you are...can give them real staying power

Like flossing, frequent engagement with a product, especially over a short period of time, increases the likelihood of forming new routines.

The aim is to influence customers to use your product on their own, again and again without relying on overt calls to action such as ads or promotions.

For an infrequent action to become a habit, the user must perceive a high degree of utility, either from gaining pleasure or avoiding pain.