A
system is disclosed that uses profiles of users, including monitored
ketone levels of the users, to assess effectiveness levels of health programs (such as
weight loss programs) assigned to the users, and to select
health program modifications for the users. The
system may use a
machine learning (
artificial intelligence)
algorithm to adaptively learn how to classify users and to select messaging and behavioral modifications for the users. For example, in some embodiments the
system classifies the users and provides associated
health program recommendations using a computer model trained with expert-classified user
data records. As another example, a set of rules may be used to generate the
health program recommendations and related messaging, and the set of rules may automatically be modified over
time based on feedback data reflective of health program effectiveness levels produced by such rules. In some embodiments the system includes a mobile application that runs on mobile devices of users and communicates wirelessly with breath analysis devices of the users. The mobile application may also communicate with a
server-based system that generates the health program recommendations.