Eating and weight
A habit tracker for weight loss, without counting anything
Gary Bennett on NPR's Life Kit: one woman tracked her goals with a smiley or sad face a day. What self-monitoring research says, and how to try it.
Short read1h Protocols · October 18, 2026 · 3 min read
On NPR's Life Kit ("A Saner Mindset for Weight Loss", May 2019), host Maria Godoy explained that many people find tracking every bite tedious, and that Duke University psychologist and obesity researcher Gary Bennett does too. So, she said, he asks people to track their goals instead. In that conversation Bennett told the story of one woman who did exactly that, with the simplest tool there is.
She got a day planner and just put a smiley face or a sad face
Gary Bennett, Life Kit, 2019
Each day, Bennett said, she marked a happy face if she thought she'd done pretty well at her goals, and a sad face if she hadn't. She did well, felt good about her progress, and could read the trends just by flipping through the planner.
Why it works on paper
The planner held one mark a day, and that mark was about what she did. It didn't record her weight, her food or a number to hit. That makes it quick to keep and hard to fail at, because a sad face is just information about one day. Over a few weeks, the faces turn into a pattern: which days go well, which ones slip, and what tends to sit behind the slips.
What the research says
Writing down what you do has a long record in weight programs. A 2011 review of 22 studies found a consistent link between self-monitoring and weight loss. A 2021 review of 39 trials of digital tools found the same link in about three quarters of cases. It also found that few programs got people to keep monitoring on most days. Full food logs are hard to sustain.
Most of those studies tracked food, activity or weight, inside programs with regular contact. Bennett's version, one mark for the goals of the day, hasn't been tested on its own. The closest evidence comes from a small 2008 trial. Adults with overweight were given a leaflet of simple habit advice and a checklist to tick off their habits. Over eight weeks they lost more weight than a group on a waiting list.
One caution from the same episode: food diaries don't suit everyone, and for some people any tracking turns into anxious watching. If a sheet starts to feel like a test, stop writing it and keep the habits.
How this fits the Lose weight sustainably program
The program ends with a fourteen-day sheet built the same way. Each evening you check off the habits you kept and answer one question, whether today went roughly as you planned: yes, mostly, or no. There's no food diary and nothing to count; adults can switch on a weekly weigh-in, and the program never reads or stores the number. On day seven your page asks whether each habit was possible, and on day fourteen you keep, shrink or swap each one, with four one-tap check-ins by email on days 1, 7, 14 and 30. Start Lose weight sustainably; the first chapter is free.
Source: NPR Life Kit, "A Saner Mindset for Weight Loss" with Yoni Freedhoff and Gary Bennett, 3 May 2019 Research: Burke et al, Self-monitoring in weight loss, a systematic review (2011) · Patel et al, Self-monitoring via digital health in weight loss interventions (2021) · Lally et al, Healthy habits, simple advice on weight control (2008)
