An app or a smart watch to regulate your body budget

A note for Lesson no. 6, "Brains Make More Than One Kind of Mind," in Seven and a Half Lessons About the Brain by Lisa Feldman Barrett.
Some context from page 106‌‌‌ is:

Ideally, evolution would have given you something more specific, like an app or a smart watch to regulate your body budget precisely.

The appendix adds:

This analogy also appears in my 2018 TEDx Talk...

What is this?

This general idea came from a conversation with my fitness coach, Michael Alves, who suggested the futuristic possibility of a microchip or smart watch that could directly sense specific nutrient needs and make on-the-spot dietary recommendations. I first presented the idea in my 2018 TEDx Talk.

See also

• A man who served in the Rhodesian army