How the coaching works

JAMA · US Preventive Services Task Force: Across 67 trials, behavioral weight-management programs produced greater average weight loss than comparison groups at 12–18 months.1

Published in JAMA in 2018, the review found an average difference of approximately 2.4 kg. Programs commonly combined nutrition and activity changes with goal setting, monitoring, and problem solving. The finding supports these programs as a whole; it does not establish the effect of each feature separately or predict results from our service.

Newcastle University · Food4Me: Advice tailored to participants’ existing diets improved eating patterns more than general dietary guidance in a six-month randomized trial.2

The trial involved adults across seven European countries. Personalized advice improved dietary quality, including lower salt and saturated-fat intake. Adding genetic or blood-marker information did not improve its effectiveness further. The findings directly support dietary personalization; they do not establish the effect of tailoring advice to every schedule or life circumstance. Considering those circumstances is our practical design choice.

UNC Chapel Hill and New York University: A review of 642 tests found that linking an action to a specific situation helped people follow through on their goals.3

Published online in 2024, the review covered a range of behaviors and other outcomes. Effects were stronger for explicit “if–then” plans that connect a situation with a response. Its findings support cue-linked planning, rather than showing that choosing any small goal is effective. Effects varied across studies, and publication bias was identified. The review does not predict weight loss from our coaching.

University of South Australia · 2024: A review of 20 studies identified repetition and contextual cues as important to forming health-related habits.4

The habit review found substantial variation in how long habit formation takes. Many included studies had a high risk of bias. The evidence does not establish a universal timetable for forming a habit or an ideal coaching contact frequency.

Evidence for ongoing support: A 2024 Northwestern University trial of 400 adults found greater six-month weight loss when human telephone coaching was added to a digital monitoring and feedback system. This supports coaching alongside digital tools; it did not test AI coaching or prove that coaching caused stronger habits.5

The trial found no demonstrated additional benefit from more intensive treatment adjustments for people with an insufficient response.

Stanford University and Duke University: Across 39 trials, greater engagement in digital self-monitoring was associated with greater weight loss.6

The review included digital tracking of diet, physical activity, and weight. The association does not show that tracking alone causes weight loss, and engagement often declined over time. Our conversations can support reflection, but they are not equivalent to every tracking method studied. We review follow-through, practical fit, and progress; everyday observations cannot prove the isolated effect of a particular change.