Knowledge Hub
The same information shown to every user of the app — no scoring, no personalization, just facts and where they come from.
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What "overweight" and "obesity" actually mean
These terms describe a measurable pattern of excess body fat, not a judgment. The World Health Organization defines the categories using BMI thresholds and describes obesity as a chronic, complex condition shaped by genetics, environment, and behaviour together — not by willpower alone. If you want the precise definitions and the global scale of this, the source below covers it in full.
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Movement
Physical activity is one of the most consistently studied levers in weight and general health. Public health guidance sets specific weekly targets for moderate and vigorous activity, and for muscle-strengthening work — the exact numbers and what counts toward them are laid out clearly in the source below, so you can check where you stand without us interpreting it for you.
Read more: CDC — What Counts as Physical Activity for Adults →
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Nutrition quality
What you eat matters as much as how much. Diets high in ultra-processed food, added sugar, and sugar-sweetened beverages, and low in fibre, fruit, and vegetables, are consistently linked to weight gain in the research. The source below covers the specific dietary risk factors in more depth.
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Sleep
Sleep is not a passive backdrop to weight and health — insufficient or poor-quality sleep is directly linked to weight gain and a range of chronic conditions. Most adults need at least 7 hours a night. The source below goes into the mechanism and the specific health links.
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Stress
Long-term stress does more than feel bad — it triggers elevated cortisol, which can increase appetite and promote fat storage. This is a physiological pathway, not a character issue. The source below explains the mechanism in more detail.
Read more: CDC — Risk Factors for Obesity (stress and cortisol) →
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Why logging works
This app's core mechanic — logging what you do, consistently — isn't an arbitrary design choice. The National Weight Control Registry has tracked over 10,000 people who lost significant weight and kept it off for years, and self-monitoring (regular self-weighing, food logging) is one of the most consistent behaviours among those who succeed long-term. The source below is the registry itself, with more on what the research actually shows.
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GLP-1 medications — the basics
GLP-1 receptor agonist medications (used for diabetes and, at higher doses, weight management) work by affecting appetite and digestion. This app's Medication Journal is a personal log for your own dose and side-effect notes — it does not give dosing advice or interpret your symptoms. For how these medications actually work and what's currently approved, see the source below, and talk to your prescribing healthcare provider for anything specific to your treatment.
Read more: NIDDK — Prescription medications to treat overweight and obesity →
Sources last checked: 2026-08-10