7 Ways to Preserve Muscle While Taking GLP-1 Medications

GLP-1 medications can produce substantial weight loss, and some of that weight can come from lean tissue as well as body fat. That does not mean muscle loss is inevitable or that everyone using these medications will develop weakness or sarcopenia. It does mean that muscle preservation deserves attention while weight is coming down.

The most useful strategy is not a single food, supplement, or exercise. Current clinical guidance favors a combination of resistance training, adequate protein and overall nutrition, regular physical activity, management of medication-related eating difficulties, and monitoring of muscle strength and function. A 2026 meta-analysis also found that resistance-training lifestyle programs had a more favorable lean-mass profile during weight loss than lifestyle intervention alone.

Here are seven practical ways to put those principles into action.

1. Make resistance training the foundation

If preserving muscle is the goal, resistance training deserves a central place in the plan.

Muscle is responsive to demand. Challenging a muscle against resistance provides a signal to maintain—or, depending on the person and training program, potentially build—muscle tissue and strength. During weight loss, that signal becomes particularly valuable because the body is operating with less available energy.

A 2026 meta-analysis of 20 randomized trials involving 15,782 participants found that lean mass accounted for roughly 25% to 39% of weight lost with incretin-based medications. Lifestyle interventions produced a broadly comparable proportional loss, but programs incorporating resistance training had the most favorable lean-mass profile in the analysis.

The 2025 joint advisory from the American College of Lifestyle Medicine, American Society for Nutrition, Obesity Medicine Association, and The Obesity Society likewise emphasizes structured resistance or strength training for people using GLP-1-based obesity treatment. The advisory notes that aerobic activity alone appears less effective at preserving lean mass during rapid weight reduction.

Resistance training does not have to mean bodybuilding or lifting extremely heavy weights. Depending on ability and experience, it can include:

• weight machines;
• free weights;
• resistance bands;
• body-weight exercises;
• professionally supervised strength programs.

The important elements are that the muscles are challenged regularly and that the program progresses appropriately as strength improves.

Someone who has been sedentary, has significant joint limitations, balance problems, cardiovascular disease, frailty, or another medical condition may need a more individualized starting point. An exercise professional or physical therapist can help modify training when necessary.

2. Make protein a daily priority

Muscle preservation requires both a training stimulus and the nutritional building blocks needed to support muscle tissue. Protein supplies amino acids used in muscle protein turnover and repair.

That becomes especially relevant with GLP-1 therapy because reduced hunger, early fullness, food aversions, nausea, or other gastrointestinal effects can make eating enough protein more difficult. The multisociety GLP-1 nutrition advisory specifically identifies adequate protein intake as a priority during treatment.

One practical approach is to give protein-rich foods priority when appetite is limited rather than waiting until the end of a meal. Depending on dietary preferences, examples might include:

• Greek yogurt or cottage cheese;
• eggs;
• fish and seafood;
• poultry;
• beans, lentils, and other legumes;
• tofu and other soy foods;
• nuts, seeds, and nut or seed butters;
• protein-containing drinks when ordinary food intake is insufficient.

There is not one universal protein number that is appropriate for every GLP-1 user. Needs can vary with age, body size, activity, weight-loss rate, medical conditions, and how protein requirements are calculated. The 2025 joint advisory notes that higher protein intakes have been proposed during active weight reduction, but it also highlights uncertainty over whether calculations for people with obesity should use actual body weight, adjusted weight, or fat-free mass.

Kidney disease and certain other medical conditions can also change what an appropriate protein intake looks like. That is why individualized advice from a registered dietitian or clinician can be more useful than following a high-protein target taken from social media.

For a fuller discussion, see our guide to how much protein you may need while taking GLP-1 medications.

Protein does not replace strength training

It is tempting to treat protein as insurance against muscle loss, but the two strategies are not interchangeable.

The joint clinical advisory specifically cautions that increased protein intake by itself is unlikely to provide the same muscle-preserving effect as adequate protein combined with structured resistance training.

A useful way to think about it is that resistance exercise gives muscle a reason to stay, while nutrition helps provide the resources to support it.

3. Protect overall nutrition when your appetite drops

Muscle preservation is not only about protein.

GLP-1 medications can substantially reduce appetite, and some people begin eating much smaller amounts almost without realizing how low their overall intake has become. When less food is being eaten, every meal has to do more nutritional work.

The 2025 multisociety advisory recommends emphasizing nutrient-dense foods such as vegetables, fruits, whole grains, legumes, dairy or appropriate alternatives, lean protein foods, nuts, seeds, and healthful fats. It also recommends ongoing attention to hydration and nutrient adequacy during treatment.

When appetite is especially low, large meals may be difficult. Smaller eating occasions can sometimes make adequate nutrition more manageable. Foods such as yogurt, cottage cheese, eggs, soups, smoothies, or protein-containing drinks may also be easier to tolerate than a large solid meal for some people.

This matters because muscle is unlikely to thrive in the setting of chronic undernutrition simply because protein has been added to the diet. Vitamins, minerals, carbohydrates, dietary fats, fluids, and sufficient overall energy all contribute to normal physiological function and the ability to train and recover.

A 2026 review of GLP-1-related muscle preservation similarly concluded that the most defensible approach combines food-first nutrition, adequate protein, resistance exercise, management of gastrointestinal side effects, and risk-based monitoring rather than relying on any single intervention.

4. Do not turn reduced hunger into an aggressive crash diet

A medication that markedly reduces appetite can make it possible to eat far less than before. That does not necessarily mean eating as little as possible is better.

One potential problem is unintentional prolonged fasting. Someone may skip breakfast because they are not hungry, forget lunch for the same reason, and then discover late in the day that very little food or protein has been consumed.

The GLP-1 joint advisory warns that extended periods without adequate protein or dietary variety can contribute to nutritional inadequacy and loss of fat-free mass. It recommends regular eating patterns and sufficient calories and protein rather than allowing suppressed appetite to become prolonged under-eating.

This does not mean everyone needs the same meal schedule or that intermittent fasting is automatically inappropriate. It means that appetite suppression should not be mistaken for proof that the body no longer needs adequate nutrition.

It is also generally unhelpful to combine prescription medication with an unsupervised crash diet in an attempt to make the scale fall faster. Faster scale movement is not necessarily better-quality weight loss if nutrition, training performance, strength, or physical function deteriorate along the way.

People taking insulin or certain other glucose-lowering medications also need individualized medical guidance before making major changes to meal timing because changes in food intake can affect blood glucose management.

5. Stay physically active outside your strength workouts

Resistance training gets the most attention for muscle preservation, but it should not become the only movement you do.

Walking, cycling, swimming, recreational activity, and other forms of aerobic exercise can help support cardiovascular fitness, mobility, insulin sensitivity, and the ability to perform everyday tasks. The 2025 joint advisory recommends combining strength training with aerobic activity rather than treating the two as competing choices.

There is also a practical reason to keep moving.

When people eat substantially less, some may unconsciously become less active because they feel tired or simply move less throughout the day. A workout cannot completely compensate for spending nearly all remaining hours sedentary.

That does not mean forcing extra exercise when you are dizzy, dehydrated, ill, or unable to eat adequately. Instead, the goal is to maintain a sustainable level of daily movement that matches your health and fitness level while using resistance training as the primary muscle-focused exercise.

A well-designed plan should also leave enough time and energy for recovery. Constantly increasing exercise while simultaneously eating less and less can work against the goal of maintaining performance and physical function.

6. Address nausea, vomiting, and other eating barriers early

Muscle-preservation advice is difficult to follow if medication side effects make eating and drinking consistently difficult.

Gastrointestinal effects are common enough with GLP-1 treatment that the multisociety advisory identifies their nutritional management as a major component of care. Reduced appetite, nausea, vomiting, early fullness, constipation, altered food preferences, and other symptoms can all interfere with adequate intake.

Someone who feels full after a few bites may benefit from choosing smaller portions of nutrient-dense foods rather than starting with foods that fill the stomach while supplying relatively little protein or other nutrition.

Fluids matter too. Poor hydration can affect how someone feels and performs during exercise and may accompany vomiting or substantially reduced intake.

Persistent or severe symptoms deserve medical attention rather than simply trying to “push through” them. Contact the prescribing clinician when side effects make it difficult to stay hydrated, eat adequately, or function normally. Medication doses or schedules should not be changed independently unless the prescriber has already provided specific instructions for doing so.

This is particularly important if vomiting is persistent, weakness is worsening, or there are other concerning symptoms.

7. Monitor strength and function—not just pounds lost

A scale measures total body weight. It cannot tell you whether a change came from fat, water, lean tissue, or some combination.

Body-composition tests such as DXA and bioelectrical impedance can provide additional information, but they also have limitations. They estimate body compartments and should not automatically be interpreted as direct measurements of skeletal-muscle health.

That is why current clinical discussions increasingly emphasize muscle function as well as muscle quantity.

The GLP-1 joint advisory notes that useful assessments can include muscle strength and physical-performance measures in addition to body composition. Depending on age and circumstances, clinicians may consider measures such as sit-to-stand performance, stair climbing, timed mobility tests, grip strength, or other functional assessments.

In everyday life, changes worth noticing might include:

• progressively declining performance in usual strength exercises;
• increasing difficulty rising from a chair;
• new trouble climbing stairs or carrying ordinary objects;
• persistent weakness rather than ordinary post-workout fatigue;
• substantially reduced activity because of low energy;
• continued difficulty eating enough food or protein.

Not every temporary decrease in gym performance means muscle is being lost. Sleep, stress, illness, hydration, calorie intake, and training fatigue can all affect performance.

The value comes from watching the trend, particularly when several changes occur together.

Some people warrant closer monitoring

The consequences of losing muscle are not identical for everyone.

An otherwise healthy younger adult beginning with substantial muscle reserves may have a different risk profile from an older person who is already frail or has low strength. Current reviews identify older adults, people with sarcopenic obesity, people with type 2 diabetes, and those with other risk factors for poor muscle health as groups deserving particular attention.

A clinician, registered dietitian, exercise physiologist, or physical therapist may therefore be useful when weight loss is substantial or when there are concerns about nutrition, mobility, strength, or pre-existing muscle loss.

What about creatine and muscle-preserving supplements?

Supplements are increasingly marketed to people taking GLP-1 medications, but they should not displace the strategies with the strongest practical foundation.

Creatine, essential amino acids, leucine, HMB, omega-3s, and other products have biological rationale or supporting evidence in certain populations. However, direct evidence demonstrating that these supplements prevent clinically meaningful muscle loss specifically during GLP-1 therapy remains limited.

A 2026 review concluded that interventions such as creatine and amino-acid supplements currently rely largely on indirect or population-specific evidence in this setting.

That makes resistance training, adequate food and protein intake, side-effect management, and appropriate monitoring higher priorities.

Supplements can also be inappropriate for some medical conditions or interact with other aspects of care. Anyone considering them in the setting of chronic disease or multiple medications should discuss that decision with an appropriate clinician.

Aim for better-quality weight loss, not just a lower number

Preserving muscle while taking a GLP-1 medication is not about preventing every possible change in lean tissue. Some lean-mass reduction commonly accompanies substantial weight loss regardless of the method used.

A better goal is to shift the weight-loss process as much as reasonably possible toward fat reduction while maintaining useful muscle, strength, physical function, and adequate nutrition.

The practical priorities are straightforward even though the science continues to evolve: challenge your muscles with appropriate resistance exercise, eat enough protein and nutrient-dense food, avoid letting appetite suppression become chronic undernutrition, remain physically active, address treatment-related eating problems, and pay attention to how your body is functioning—not just what the scale says.

For someone with frailty, kidney disease, significant weakness, poor nutritional intake, persistent gastrointestinal symptoms, or another condition that changes exercise or dietary needs, those strategies should be individualized with the healthcare professionals involved in treatment.

References

1. Mozaffarian D, Agarwal M, Aggarwal M, et al. “Nutritional Priorities to Support GLP-1 Therapy for Obesity: A Joint Advisory From the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association, and The Obesity Society.” Obesity Pillars, 2025.
2. Eisa N, Barood O. “Lean Mass Changes With Incretin Therapy Versus Lifestyle Intervention: A Systematic Review and Meta-Analysis of Randomised Controlled Trials.” Diabetes, Obesity and Metabolism, 2026.
3. Menezes MLL, Chiappa MEG, Kloss RF, et al. “Body Composition Remodelling During GLP-1-Based Therapy: A Systematic Review and Meta-Analysis Using a Hierarchical Physiological Framework.” Diabetes, Obesity and Metabolism, 2026.
4. “Lean Mass and Musculoskeletal Preservation in GLP-1-Based Obesity Treatment: Nutrition, Exercise, Supplementation, and Monitoring Strategies.” Nutrients, 2026.
5. European Association for the Study of Obesity, European Federation of the Associations of Dietitians, and European Coalition for People Living with Obesity. “Nutritional, Functional, and Psychological Considerations for Incretin-Based Therapies in Adults: An EASO, EFAD, and ECPO Consensus Statement.” 2026.