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Personalized, Adaptive Action Plans: Interview With Dario Health’s Former Chief Product Officer Eitan Shay

5 min readDec 5, 2025

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Eitan Shay, Former Chief Product Officer of Dario Health

Product absolutely must reflect the voice of the customer, Eitan tells me. And he’s serious about it. He emphasizes the importance of spending time to meet and really get to know users, conducting both primary and secondary research, collecting data firsthand and drawing from the literature to design products for the humans who will use them.

Behavioral science, he says, can uniquely help product leaders understand their customers. And once you understand the similarities and differences across users and even within users, you can start to personalize and adapt. Because users are not frozen in time, but ever-changing beings whose needs and preferences change over time and in different contexts.

In this interview, Eitan shares his work leveraging behavioral design by creating personalized, adaptive plans in his former role at Livongo.

Tell me something I don’t know. (Anything!)

​​I started running in my 40s. I’m now an amateur triathlete.

Which fiction book would you recommend to product leaders? Why?

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Aline Holzwarth
Aline Holzwarth

Written by Aline Holzwarth

Aline Holzwarth is an applied behavioral scientist, primarily focusing on digital health research and scientifically informed product design. alineholzwarth.com