What the National Weight Control Registry tells us about people who keep weight off.
What the evidence says
- In Klem 1997’s report, ”the 629 women and 155 men in the registry … maintained a required minimum weight loss of 13.6 kg for 5 y”. That describes this cohort; the registry’s standing entry criterion is not stated in the held abstract[1]
- Members lost an average of 30 kg[1]
- ”A little over one-half of the sample lost weight through formal programs; the remainder lost weight on their own”. Both routes appear among people who succeeded; this registry was selected for success, so it cannot show that either route works[1]
- Common pattern: used BOTH diet AND exercise, not one or the other[1]
- 77% reported a triggering event preceded their successful weight loss[1]
- 42% report maintenance is EASIER than the initial loss was[1]
- Average reported daily intake: 5,778 kJ (about 1,381 kcal, converted), with 24% of energy from fat[1]
- High physical activity characteristic: ~11,830 kJ/week (~2,827 kcal/week) expenditure[1]
- Participants report improved energy, mood, self-confidence, and health[1]
- 78% eat breakfast every day; only 4% never eat breakfast; no difference in total energy intake between breakfast eaters and non-eaters[2]
- 36% weigh themselves daily; those who decreased weighing frequency regained 4.0 kg at 1 year vs 1.1 kg for those who increased — effect is independent of other behavior changes[3]
- Approximately 20% of overweight individuals succeed at long-term weight loss, defined as losing ≥10% of initial body weight and maintaining it for ≥1 year[4]
- Maintenance may get easier over time — ”weight loss maintenance may get easier over time; after individuals have successfully maintained their weight loss for 2-5 y, the chance of longer-term success greatly increases”. The hedge is the review’s own and belongs to the claim[4]
- Low levels of depression and disinhibition are associated with long-term maintenance success[4]
- Consistent eating patterns across weekdays and weekends distinguish successful maintainers — registry members reporting the same diet regimen all week were 1.5x more likely to stay within 5 lbs over the next year than members who reported dieting more strictly on weekdays (OR=1.58, 95% CI: 1.2–2.2). The second group is part of the number: an odds ratio without its comparator is half a finding. A similar relationship held for holiday and vacation consistency, but no odds ratio was reported for it — the 1.58 belongs to the weekday/weekend question alone[4],[5]
- Successful maintainers use significantly more self-regulation strategies (goal-setting, self-monitoring, self-evaluation, environmental structuring) than those who fail to maintain — and have higher self-efficacy perceptions[6]