There is a body of evidence on people who lost a lot of weight and kept it off for years, and it points at a short and unglamorous list. It is worth reading with its limits attached, because those limits are substantial: it comes from a registry of volunteers who had already succeeded, it is observational throughout, and it predates GLP-1 medication entirely. Within those bounds, it is the best picture available of what maintenance actually looks like.
National Weight Control Registry: a long-running registry of people who lost at least 13.6 kg and kept it off for at least a year. Self-selected volunteers, not a random population sample.
The limits, stated first
Because they change how much weight to give everything below.
The registry recruits people who already succeeded. That is survivorship bias built into the design: you cannot learn from it what distinguishes success from failure, only what successful people report doing. It is self-reported, and self-reported dietary intake is systematically under-reported. And none of it involves GLP-1 medication.
So read what follows as a description of maintainers, not a set of instructions with proven causal force. Anyone presenting it as "the five habits that guarantee you keep it off" has removed the part that matters.
What maintainers report
A large amount of physical activity. In the founding study of 784 members — who had lost a mean 30 kg and kept at least 13.6 kg off for five years — reported physical activity averaged about 11,830 kJ a week, roughly 2,828 kcal, which is close to an hour a day (Klem 1997). That is a lot, and it is one of the most consistent findings in the literature.
A consistent eating pattern, reported in that cohort as low in fat, at 24 ± 9% of energy. The specific macronutrient framing reflects the era; the more durable observation is consistency rather than a particular composition.
Regular self-weighing. This one has its own study, and it is the most quantitatively useful finding here. Following 3,003 registry members, of whom 82% completed a year of follow-up, weight change tracked with change in self-weighing frequency: those who weighed themselves less often gained 4.0 ± 6.3 kg, those whose frequency was unchanged gained 1.8 ± 5.3 kg, and those who weighed more often gained 1.1 ± 6.5 kg. The association held independently of other measured factors (Butryn 2007).
Worth being precise: this is the correct source for a self-monitoring claim. The founding registry papers do not report one.
There is an obvious tension between that finding and our own advice that the scale is a poor progress measure. Both can be true. During active weight loss, the scale misleads about composition. During maintenance, it is an early-warning system for drift — a different job, and one it does well.
What predicts regain
Following registry members for a year, 35% gained weight and 59% maintained their losses. Regain was more likely in those whose weight loss was recent rather than established — under two years versus two or more — those who had lost a larger share of their maximum weight, and those with higher levels of depression, dietary disinhibition and binge eating. Those who regained showed decreases in energy expenditure and dietary restraint, and increases in dietary fat, hunger and disinhibited eating (McGuire 1999).
The time finding is the encouraging one. Maintenance appears to get easier: once a loss has been held for two to five years, the chance of continued success rises substantially (Wing 2001). The same review estimates that more than 20% of people with overweight or obesity achieve a loss of at least 10% held for at least a year — a minority, and a much larger one than the folklore suggests.
How much activity, specifically
The most citable figure comes from the ACSM position stand: cross-sectional and prospective studies indicate that after weight loss, maintenance is improved with physical activity above 250 minutes a week (ACSM 2009).
The same document says, in its own words, that no evidence from well-designed randomised controlled trials existed to judge the effectiveness of physical activity for preventing regain. We are quoting the best available guidance and telling you it is observational, because both of those are true.
Two hundred and fifty minutes is around 35 minutes a day. It is more than the general activity guideline, and it is roughly consistent with what registry maintainers report.
Where this meets medication
The regain data on stopping GLP-1 medication is stark: about two-thirds of lost weight back within a year in the STEP 1 extension (Wilding 2022). The maintenance literature is the only body of evidence describing what the people who buck that kind of trend actually do.
It does not transfer cleanly — different era, different mechanism, self-selected sample. But the direction it points is the same one the treatment evidence points: activity, consistency, and monitoring something.
There is one thing the registry literature does not cover that the trial literature does. Lean mass was statistically unchanged where resistance training accompanied caloric restriction, across 114 trials and 4,184 people (Lopez 2022). Muscle carried into maintenance is a structural advantage the registry never measured.
At GetLean, our philosophy is that GLP-1 medication should act as a catalyst — not something to depend on indefinitely. This is the evidence base for what the catalyst is supposed to be building towards: a level of activity, a consistent pattern, and a habit of paying attention, all established while the medication is making them easier to establish.
Individual results vary, and this evidence is observational and predates GLP-1 medication.
Common questions
What do people who keep weight off actually do?
Registry data points to a high level of physical activity, around an hour a day, and a consistent eating pattern (Klem 1997), alongside regular self-weighing (Butryn 2007). It describes maintainers rather than proving what causes maintenance.
How much exercise does maintenance take?
The ACSM position stand associates more than 250 minutes a week with improved maintenance, on cross-sectional and prospective evidence, while stating that no randomised trial evidence confirmed it (ACSM 2009).
Does weighing yourself regularly help?
It is associated with better outcomes. Among 3,003 registry members, 82% of whom completed a year of follow-up, those who weighed themselves less often gained 4.0 kg against 1.1 kg for those who weighed more often (Butryn 2007). Observational rather than causal.
Does maintenance get easier over time?
The evidence suggests so. Having held a loss for two years or more was associated with lower regain risk over the following year (McGuire 1999), and holding it two to five years substantially improves the odds (Wing 2001).
Do these findings apply to people who lost weight on medication?
Not directly. This evidence is observational, comes from a self-selected registry of people who already succeeded, and predates GLP-1 medication.