How to Maintain Weight Loss: What Research Shows

Losing weight gets most of the attention. Keeping it off is the part that decides whether the effort pays off over years, and it is where most people struggle. Researchers have studied weight maintenance for decades, through large trials, registries of people who kept weight off, and, more recently, studies of what happens when people stop GLP-1 medications such as semaglutide and tirzepatide.

This guide explains why maintaining weight loss is hard, what long-term studies actually show, which habits are linked to lasting results, what the evidence says about GLP-1 medications and regain, and how to build a realistic maintenance plan with your care team.

Educational only. This is not medical advice. Decisions about weight goals, exercise, diet and any medication, including whether to continue, lower or stop a GLP-1, should be made with a licensed clinician who knows your health history.

The short answer

Keeping weight off is possible, but it usually takes ongoing, deliberate effort, because the body responds to weight loss by increasing appetite. The habits most consistently linked to long-term maintenance are plenty of physical activity, regular self-weighing, a steady and moderate eating pattern, and continued contact with a care team or structured program. For people on GLP-1 medications, trials show weight tends to return after treatment stops, so maintenance planning should start while you are still losing weight, together with your prescriber.

What counts as “maintaining” weight loss?

There is no single official definition, but researchers often use a practical one. In a widely cited review, Rena Wing and Suzanne Phelan defined successful long-term maintenance as losing at least 10% of starting body weight and keeping it off for at least one year. By that definition, they estimated that roughly 20% of people with overweight who try are successful.

Other studies use a 5% threshold, because losses of 5% or more are linked to meaningful health improvements for many people. And maintenance is rarely a perfectly flat line. Weight moves up and down by a few pounds from day to day because of water, salt, food in the gut and hormones, which our guide to why weight loss plateaus explains in more detail. A more useful goal is to keep your weekly or monthly average within a personal range.

Why keeping weight off is so hard

Appetite rises more than metabolism falls

When you lose weight, your body burns somewhat fewer calories, partly because a smaller body needs less energy. But the bigger change is in appetite. In a 2018 review, NIH researcher Kevin Hall and Scott Kahan of George Washington University and Johns Hopkins estimated that for each kilogram (2.2 pounds) of weight lost, calorie expenditure falls by about 20 to 30 calories a day, while appetite increases by about 100 calories a day above where it was before weight loss.

That means a person who has lost 10 kg (22 pounds) may be working against a pull to eat several hundred extra calories a day. Hall and Kahan estimate that preventing regain requires about 300 to 500 calories a day of persistent “effort” to counter the combination of slower metabolism and stronger appetite. Much of this happens below conscious awareness: portion sizes can creep up slowly, and day-to-day intake already varies by 20% to 30%, so the drift is hard to notice.

Metabolic changes can last

A small but often-quoted NIH study followed 14 contestants from the TV competition “The Biggest Loser.” Six years after the show, their resting metabolic rate was still about 700 calories a day lower than before the competition, even though most had regained much of the weight. This was an extreme situation, with very rapid and large weight loss in a tiny group, so it does not describe what happens to most people. It does show that the body’s adjustments to weight loss can be long-lasting.

The environment works against maintenance

Hall and Kahan also point to the food and activity environment: highly processed foods now provide most of the calories Americans eat, food is cheap and widely available, fewer meals are cooked at home, and many jobs and commutes involve long hours of sitting. None of this makes maintenance impossible, but it explains why it takes a plan rather than willpower alone. For the basics of how intake and expenditure interact, see calories in, calories out, explained.

What long-term studies show

Here is how the major long-term studies of lifestyle-based weight loss turned out:

Study	Who	What happened
Meta-analysis of 29 long-term US studies (Anderson 2001, cited by Hall and Kahan)	People in weight-loss programs	More than half of lost weight was regained within 2 years; more than 80% by 5 years, on average
Look AHEAD (8 years)	5,145 adults with type 2 diabetes	Intensive lifestyle group: peak loss 8.5% at year 1, then partial regain that leveled off; 4.7% average loss at year 8 vs 2.1% with education only
National Weight Control Registry (10 years)	2,886 people who had already lost at least 30 lb and kept it off a year	Average loss of 31.3 kg (about 69 lb) at entry and 23.1 kg (about 51 lb) at 10 years; more than 87% estimated to still have at least a 10% loss
STOP Regain trial (18 months)	314 people who had lost about 19 kg (43 lb)	Regain of 5 lb or more in 72.4% with newsletters only vs 45.7% with a face-to-face program built on daily weighing

Two lessons stand out. First, regain is common, but not inevitable. In Look AHEAD, half of the lifestyle group (50.3%) still had at least 5% weight loss after eight years, and 26.9% had at least 10%. Of 825 people who lost 10% or more in the first year, 39.3% still had a 10% loss at year 8, and another 25.8% kept a loss of 5% to 10%.

Second, ongoing support matters. Look AHEAD did not stop after the weight-loss phase: participants had monthly individual meetings, group sessions and refresher programs for years. Hall and Kahan note that several studies show ongoing contact with health professionals or groups improves maintenance, and US obesity guidelines recommend maintenance programs that last at least a year.

Keep in mind that the National Weight Control Registry is a self-selected group of successful people who report their own weight and habits. It tells us what successful maintainers do, not how common success is.

Habits linked to keeping weight off

The same handful of behaviors shows up again and again across registries and trials. None of them is a guarantee, and the studies are mostly observational, but they are the best guide we have.

1. Stay very active

Physical activity is one of the strongest and most consistent predictors of maintenance. The Physical Activity Guidelines for Americans say many people need more than 150 minutes a week of moderate activity to maintain their weight, and that people trying to keep a significant amount of weight off may need more than 300 minutes a week. National Weight Control Registry members report about an hour of activity a day.

In Look AHEAD, people who kept off a 10% loss for eight years reported nearly twice as much activity-related energy use as those who regained above their starting weight (about 1,470 vs 800 calories a week). In the registry, a decline in leisure-time activity was one of the behaviors linked to greater regain.

Walking counts. Our guide to walking for weight loss covers how to build up step counts and minutes safely.

2. Keep an eye on the scale, without obsessing

Regular self-weighing works as an early-warning system. In the STOP Regain trial, increasing daily self-weighing was linked to a lower risk of regaining 5 pounds or more. In Look AHEAD, 47.8% of long-term maintainers weighed themselves daily, compared with 28.4% of people who regained above their starting weight. The NIDDK lists weekly weight monitoring as a standard part of safe, effective weight-loss programs.

What helps is reacting early to a small upward trend, not judging yourself over one number. If weighing causes anxiety or unhealthy behaviors, talk with your care team about tracking other markers instead, such as waist size, how clothes fit, or strength and fitness.

3. Keep your eating pattern steady

Registry members report eating a lower-calorie, lower-fat diet, eating breakfast regularly and keeping a consistent eating pattern across weekdays and weekends, rather than strict weekdays followed by free-for-all weekends. Hall and Kahan also list more meals at home, less screen time and, for some people, portion-controlled meals or meal replacements as habits associated with success.

There is no single “best” maintenance diet. In long-term trials, low-carbohydrate and low-fat diets produce similar average results, and the pattern you can keep up matters more than the label. Protein is one exception worth highlighting: higher-protein diets may help with fullness and with keeping weight off, according to the studies Hall and Kahan review. See how much protein you need and what to eat on a GLP-1 for practical meal ideas.

4. Protect your muscle

The guidelines note that muscle-strengthening activities help with weight maintenance, though not as much as aerobic activity, and they help preserve lean body mass during weight loss. Muscle matters for strength, balance and daily function as you get older, and it is especially relevant if you lost weight quickly. Our guide to strength training on GLP-1s explains how to start.

5. Stay connected to support

Weight management works best as ongoing care rather than a short course. That might mean regular check-ins with a primary care clinician, a registered dietitian, an obesity medicine specialist, a group program or a structured online program. In the STOP Regain trial, the face-to-face version of the program worked better than the internet version, though both did better than newsletters alone.

6. Expect lapses and plan for them

Hall and Kahan describe several skills that help people maintain over years:

• Relapse planning: deciding in advance how you will handle holidays, travel, illness and stressful periods.
• A personal threshold: a weight, often a few pounds above your usual range, that signals it is time to tighten habits or contact your care team.
• Flexible thinking: avoiding “all or nothing” rules, so one heavy meal does not turn into a lost month.
• Personal motivation: linking habits to things you value, such as energy, health numbers or activities you enjoy, rather than only the number on the scale.

Maintenance and GLP-1 medications

GLP-1 medications reduce appetite and increase fullness, which directly counters the rise in appetite that drives regain. Our guide to how GLP-1s work for weight loss explains the biology. The flip side is that the effect generally lasts only while you take the medicine. Several randomized trials have tested what happens when people stop:

Trial	Design	Result after stopping vs continuing
STEP 4 (semaglutide 2.4 mg)	803 adults who lost 10.6% over 20 weeks, then randomized to continue or switch to placebo for 48 weeks, with lifestyle support	Continued: a further 7.9% loss. Placebo: 6.9% regain
STEP 1 extension (semaglutide 2.4 mg)	327 adults followed for a year after stopping both the drug and the lifestyle program	Average loss of 17.3% at week 68; about two-thirds regained by week 120, leaving a net loss of 5.6%
SURMOUNT-4 (tirzepatide 10 or 15 mg)	670 adults who lost 20.9% over 36 weeks, then randomized to continue or switch to placebo for 52 weeks	Continued: a further 5.5% loss (25.3% total). Placebo: 14.0% regain (9.9% total loss remained)

A 2026 systematic review in the BMJ, led by researchers at the University of Oxford, pooled 37 studies with 9,341 participants. After people stopped weight-management medications, weight came back at about 0.4 kg (0.9 pounds) a month on average, and about 0.8 kg (1.8 pounds) a month after the newer medicines semaglutide and tirzepatide. Based on those trends, the authors projected a return to starting weight about 1.5 years after stopping the newer drugs, Across all the medicines studied, they also projected that improvements in blood pressure, blood sugar and cholesterol would return to starting levels within about 1.4 years. Weight came back faster after stopping medication than after ending a behavioral program.

Some important nuances:

• Not everyone regains everything. In the STEP 1 extension, 48.2% of people who had taken semaglutide still had at least a 5% loss a year after stopping, and people who lost the most during treatment tended to keep the most.
• Lifestyle support after stopping has not been proven to prevent regain. The BMJ review found no clear evidence that behavioral support after stopping a medication slowed regain.
• Exercise may help. In a small Danish trial (S-LiTE), adults who first lost about 13 kg (29 pounds) on a low-calorie diet then spent a year on supervised exercise, liraglutide, both or placebo. One year after all treatment ended, weight regain was about 6 kg (13 pounds) greater after liraglutide alone than after supervised exercise, and the combination group was more likely to still have a 10% loss than the liraglutide-only group. Liraglutide is an older, daily GLP-1, so results may differ with newer drugs.

The NIDDK notes that some weight-loss medicines can also be used to help maintain weight loss. People stop GLP-1 medicines for many reasons, including cost, coverage and side effects, and real-world studies cited in the BMJ review suggest about half of people with obesity stop within 12 months of starting. If cost is the concern, our guides to insurance coverage and semaglutide costs without insurance may help. For what to expect over the long run, see the GLP-1 Guide hub.

Questions to discuss before changing a GLP-1 plan

Whether to continue, lower or stop a GLP-1 is a medical decision. Lowering doses gradually or switching to another treatment are approaches some clinicians use, but the evidence for specific step-down strategies is still limited. Questions worth raising with your prescriber:

1. What is the plan if I need to stop, and how will we monitor my weight and health afterward?
2. What weight change would prompt us to revisit the plan?
3. Which health markers (blood pressure, blood sugar, cholesterol) should we recheck, and when?
4. What activity and protein goals make sense for me now, before any change?
5. Are there other treatment options if I cannot stay on this medicine?

Never change your dose or stop a prescribed medication without talking to the clinician who prescribed it.

Build your own maintenance plan

Maintenance works best when it is concrete. A simple plan, built with your clinician or dietitian, might include:

1. A weight range, not a single number, with a threshold that triggers action.
2. A weekly activity target that you build up toward over time, including some strength training.
3. A default eating routine: regular meals, a protein source at each one, plenty of vegetables, fruit and fiber, and a few go-to meals you can make on busy days.
4. A tracking habit: regular weigh-ins, or another measure you and your care team agree on.
5. A check-in schedule with a clinician, dietitian, program or support group.
6. A lapse plan for holidays, travel, illness and stressful weeks, written down before you need it.
7. A medication plan, if you take one, agreed with your prescriber.

If you notice the trend creeping upward, it is not a failure. It is information. Go back to the basics that worked, and reach out to your care team early rather than waiting. If you are in a stall rather than regaining, our guide to why weight loss plateaus explains what may be going on, and what a calorie deficit is covers the basics of adjusting intake.

Common myths, corrected

“Once the weight is off, you can go back to normal.” Not usually. The body’s push toward higher appetite continues, so the habits and support that helped you lose weight generally need to continue in some form.

“Regain means your metabolism is broken.” Metabolism does slow somewhat, but research suggests rising appetite plays a bigger role than slowing metabolism. That is good news, because appetite can be managed with food choices, routines, activity and, for some people, medication. We look at the metabolism studies in detail in does weight loss slow your metabolism?

“If you regain any weight, the effort was wasted.” No. Health benefits can last even with partial regain. In the Diabetes Prevention Program, a 7% weight loss was linked to a 58% lower risk of type 2 diabetes, even though about half of the weight came back over three years.

“Maintenance gets harder every year.” The registry data suggest the opposite for many people: after maintaining for two to five years, the chances of continued success rise considerably.

“GLP-1 medications fix the problem permanently.” Trials show that their effect on appetite and weight generally fades after stopping. They are approved for chronic (long-term) weight management, and any change should be planned with your prescriber.

When to talk to a clinician

Contact your care team if:

• your weight has crossed the threshold you agreed on, or is rising steadily for several weeks;
• you are thinking about stopping, skipping or changing a weight-loss medication;
• you notice binge eating, a feeling of losing control around food, or distress about weight or eating;
• you have new symptoms such as unusual fatigue, swelling, feeling cold, or changes in mood or menstrual cycles;
• you are starting a new medicine that may affect weight, or you are pregnant or planning a pregnancy.

What people are saying online

On X, recent posts about keeping weight off often share the “two-thirds regained within a year” figure from the semaglutide trials, discuss the 2026 Oxford review on regain after stopping weight-loss drugs, and debate whether people will need medication forever. Some personal posts stress that building exercise and eating routines while on a GLP-1 helped them feel prepared. On YouTube, obesity researchers such as James Hill, PhD, a co-author of National Weight Control Registry research, explain that these medicines work well for getting weight off, and that the harder part is deciding what comes next. Social posts and videos can raise good questions, but they are not medical evidence and cannot account for your own health history.

The bottom line

Maintaining weight loss is harder than losing it because the body responds with stronger appetite and a modest drop in calorie burning. Still, long-term studies show it is achievable: about half of people in an intensive lifestyle program kept off at least 5% for eight years, and registry members kept off large losses for a decade. The habits most linked to success are high activity levels, regular self-weighing, steady eating patterns, strength training and adequate protein, and ongoing support. For people on GLP-1 medications, weight tends to return after stopping, so planning for maintenance early, together with a prescriber, matters as much as the weight-loss phase itself.

Explore more in the Plateaus & Maintenance hub, the Exercise & Metabolism hub, the Eating on GLP-1s hub and the GLP-1 Guide hub.