What we’re learning from BodyBuddy

We study how people use BodyBuddy, an AI health accountability coach, and publish our first looks at the real-world data: where the evidence is strong, where it is weak, and what we want to test next. Every number comes with its method and its sample size.

A person returning to a text conversation beside a seven-day checklist

The first week predicts the second month

Members who messaged the AI coach on at least five days in week one were 5.0× as likely to still be active two months later, and three or four days predicted no more than two or fewer. The report also covers early weight trends among members who kept weighing in, with small samples (n=25, 13, and 6) reported alongside every number.

Published August 22, 2026Read the report