GLP-1 medications have transformed the treatment of obesity and weight management for many adults.

Medications such as semaglutide and tirzepatide can significantly reduce appetite and help appropriate patients lose substantial amounts of weight.

But eating less creates an important nutritional challenge:

When you’re eating considerably less food, every bite needs to work harder for you.

This becomes particularly important for adults over 50.

During significant weight loss, the body doesn’t lose only fat. Some lean tissue may also be lost. At the same time, aging itself can make maintaining muscle mass and strength more challenging.

That’s why protein has become an important part of the conversation surrounding GLP-1 medications, muscle loss, strength training, and healthy weight loss after 50.

A 2025 joint advisory from the American College of Lifestyle Medicine, American Society for Nutrition, Obesity Medicine Association, and The Obesity Society specifically identifies adequate dietary protein as a nutritional priority during GLP-1 therapy¹.

But there’s an equally important point:

Protein alone isn’t enough.

The best strategy for maintaining muscle during significant weight loss combines appropriate nutrition with progressive resistance training and regular physical activity¹,².

Think of it this way:

Protein provides the building materials. Strength training gives your body a reason to use them.

What Does Protein Actually Do?

Protein is one of the three primary macronutrients, along with carbohydrates and fats.

When you eat protein, your digestive system breaks it down into amino acids. Those amino acids are involved in numerous processes throughout the body, including:

• building and repairing muscle tissue
• producing enzymes and hormones
• supporting immune function
• maintaining tissues
• supporting recovery from exercise and injury
• maintaining numerous metabolic processes

Your body constantly breaks down and rebuilds proteins. Muscle tissue is part of this ongoing process.

When muscle protein synthesis exceeds muscle protein breakdown over time, muscle tissue can be maintained or increased. When breakdown consistently exceeds synthesis, muscle tissue may decline. Nutrition and exercise both influence this balance².

That’s why protein becomes especially relevant during periods of significant weight loss.

Why Does Protein Matter During Weight Loss?

Weight loss requires the body to draw upon stored energy.

Ideally, when someone has excess adiposity, we want as much of that weight loss as reasonably possible to come from body fat while preserving muscle and physical function.

However, significant calorie restriction can also contribute to loss of lean tissue. Protein can help provide the amino acids necessary to maintain and repair muscle tissue during this process.

The 2025 joint GLP-1 nutrition advisory specifically recommends prioritizing sufficient dietary protein to help preserve muscle mass and bone density, particularly when protein intake is combined with structured strength training¹.

This doesn’t mean eating protein guarantees that you won’t lose lean mass. It means protein is one important component of a larger muscle-preservation strategy.

Why Is Protein Especially Important When Taking a GLP-1 Medication?

GLP-1 medications can reduce hunger and food intake substantially. That’s part of how they help facilitate weight loss.

But reduced appetite can create a nutritional paradox:

You may need to pay more attention to nutrition precisely because you’re less interested in eating.

Some people taking GLP-1 medications may experience:

• decreased appetite
• feeling full quickly
• nausea
• changes in food preferences
• taste aversions
• difficulty eating larger meals

As a result, someone who previously consumed plenty of protein may unintentionally reduce their protein intake simply because they’re eating much less food.

The joint advisory specifically notes that achieving adequate protein can be difficult during GLP-1 therapy because of reduced appetite and/or changes in food preferences¹.

That makes nutrient density increasingly important. If you’re eating less, you want the foods you do consume to provide meaningful nutritional value.

Why Does This Matter Even More After 50?

Protein requirements and muscle health become increasingly important as we age.

Older muscle may not respond as robustly to smaller amounts of dietary protein as younger muscle. This reduced anabolic response is sometimes referred to as anabolic resistance⁵.

At the same time, aging is commonly associated with gradual reductions in muscle mass, muscle quality, strength, and physical performance.

Expert groups have therefore recommended higher protein intakes for many older adults than the basic adult Recommended Dietary Allowance.

The ESPEN Expert Group has recommended approximately 1.0–1.2 grams of protein per kilogram of body weight per day for healthy older adults, with higher amounts potentially appropriate in some people experiencing illness, injury, or malnutrition risk².

The PROT-AGE Study Group has made similar recommendations, emphasizing that adequate protein intake can help older adults maintain lean body mass and physical function³.

This becomes particularly relevant when someone over 50 is simultaneously:

Aging + Eating fewer calories + Losing substantial weight.

That combination makes protecting muscle worth paying attention to from the beginning.

Why Muscle Preservation Matters During GLP-1 Weight Loss

Muscle isn’t just about appearance.

Your muscles allow you to:

• get out of a chair
• climb stairs
• carry groceries
• walk through an airport
• lift luggage
• get on and off the floor
• maintain balance
• garden
• play golf
• play tennis or pickleball
• lift and play with grandchildren
• recover from illness
• continue living independently

This is why we shouldn’t define successful weight loss after 50 solely by the number on the scale.

Losing 40 pounds may provide tremendous health benefits.

But ideally, you want to arrive at that lower weight with as much strength and physical capacity as possible.

The better goal isn’t simply:

Lose weight.

It’s:

Reduce excess body fat while protecting muscle, strength, mobility, and function.

How Much Protein Do You Need During GLP-1 Weight Loss?

This is where the answer needs to be individualized.

The standard adult Recommended Dietary Allowance for protein is 0.8 grams per kilogram of body weight per day.

However, this is a minimum population-level recommendation designed to meet basic nutritional needs for most healthy adults — not necessarily an optimal target for preserving muscle during significant weight loss or aging.

The 2025 joint GLP-1 nutrition advisory notes that higher protein targets, such as 1.2–1.6 grams per kilogram per day, have been proposed during active weight reduction¹.

However, there is an important complication for people with obesity:

Which body weight should be used in the calculation?

Using actual body weight can substantially overestimate protein requirements in some individuals with obesity. For that reason, protein recommendations may instead consider:

• ideal or adjusted body weight
• estimated lean body mass
• age
• activity level
• degree of calorie restriction
• medical history
• kidney function
• strength-training volume
• nutritional status

The same advisory discusses an alternative practical target of approximately 80–120 grams of protein per day for some adults, while emphasizing that recommendations need to be individualized¹.

This is not a universal prescription.

Someone who weighs 120 pounds, someone who weighs 250 pounds, someone with chronic kidney disease, and someone performing intensive resistance training should not automatically receive identical recommendations.

A physician and/or registered dietitian can help establish an appropriate target.

What Does 80–120 Grams of Protein Actually Look Like?

For many people, grams of protein don’t mean much until they see them translated into food.

Approximate amounts can vary by product and serving size, but common examples include:

• 3 ounces of chicken breast: approximately 25–27 grams
• 3 ounces of salmon: approximately 20–22 grams
• 2 large eggs: approximately 12–13 grams
• 1 cup of Greek yogurt: approximately 20 grams, depending on the product
• 1 cup of cottage cheese: approximately 24–28 grams
• 1 cup of cooked lentils: approximately 18 grams
• 1 cup of cooked edamame: approximately 18 grams
• Protein shake: often approximately 20–30 grams, depending on the product

Suddenly, you can see why eating adequate protein may become challenging if someone taking a GLP-1 medication is consuming very small meals.

Should You Eat Protein First?

This can be a useful practical strategy.

If appetite is limited and you become full quickly, eating low-protein foods first may mean you’re too full to consume the protein portion of the meal.

The 2025 GLP-1 nutrition advisory specifically suggests consuming protein-rich foods first during meals to increase the likelihood of consuming adequate amounts¹.

For example, rather than filling up first on:

• bread
• crackers
• rice
• pasta
• chips

you might prioritize the protein-rich component of the meal.

This doesn’t mean carbohydrates are “bad.” It simply recognizes that when food volume is limited, nutritional priorities matter.

Which Protein Foods Are Good Choices During GLP-1 Weight Loss?

The joint advisory encourages nutrient-dense protein sources including fish and seafood, eggs, Greek yogurt, cottage cheese, lean poultry, beans, peas, lentils, whole grains, nuts, seeds, and nut and seed butters¹.

Some people tolerate smaller, softer foods better when appetite is low. Examples might include:

• Greek yogurt with berries
• Eggs with vegetables
• Cottage cheese with fruit
• A small serving of salmon with vegetables
• Lentil soup
• A smoothie made with yogurt or another protein source

The objective isn’t simply maximizing grams of protein. It’s creating a nutrient-dense eating pattern that you can tolerate and maintain.

What If You Can’t Eat Much?

This may be one of the most practical problems for people taking GLP-1 medications.

You sit down to eat. You take a few bites. And you’re finished.

If that’s happening regularly, trying to eat a large chicken breast or steak may not be realistic.

Instead, consider smaller portions of nutrient-dense foods distributed throughout the day.

The GLP-1 nutrition advisory suggests that smaller, more frequent meals may be useful when hunger and interest in food are low¹.

Options might include:

Breakfast

Greek yogurt with fruit.

Mid-morning

Eggs or cottage cheese.

Lunch

A small serving of chicken, fish, tofu, or beans.

Afternoon

A protein-containing smoothie.

Dinner

A modest serving of protein with vegetables and another nutrient-dense food.

The specific foods should reflect your preferences, tolerance, medical needs, and overall nutritional plan.

Should You Use Protein Shakes While Taking a GLP-1?

Protein shakes can be useful for some people. They can provide a relatively concentrated amount of protein without requiring a large meal.

The 2025 advisory notes that high-protein shakes and other fortified foods may help some individuals meet their protein targets¹.

But supplements shouldn’t automatically replace whole foods. Whole foods provide additional nutrients, including:

• vitamins
• minerals
• fiber
• healthy fats
• phytochemicals

Think of a protein shake as a tool, not necessarily the foundation of your diet. It may be particularly helpful when appetite is low, you’re traveling, or you’re struggling to consume enough protein through regular meals.

Is More Protein Always Better?

No.

This is an important point. If some protein is good, it doesn’t follow that enormous amounts are better. Protein intake should be individualized.

The 2025 joint advisory specifically notes uncertainty about the optimal protein target for individuals using GLP-1 medications and cautions against excessively high long-term protein intake¹.

People with certain medical conditions — particularly kidney disease — may require individualized nutritional recommendations.

That’s why an article like this shouldn’t be interpreted as:

“Everyone taking a GLP-1 needs 150 grams of protein every day.”

That’s not the message. The message is:

Don’t allow dramatically reduced food intake to unintentionally become inadequate nutrition.

Protein Alone Won’t Protect Your Muscle

This may be the most important section of this article.

Imagine eating plenty of protein but never challenging your muscles.

Your body has building materials available. But you’re providing very little reason for the body to maintain or increase its physical capacity.

This is why the 2025 joint advisory explicitly emphasizes that increased protein intake alone is likely insufficient to preserve muscle mass without structured resistance or strength training.¹

Protein and resistance training work together. A useful way to think about it is:

Protein provides the building blocks. Strength training provides the signal.

Both matter.

Why Walking Isn’t a Substitute for Strength Training

Walking is excellent exercise. It supports:

• cardiovascular health
• endurance
• blood glucose regulation
• mobility
• mental health
• daily physical activity

Keep walking.

But walking doesn’t provide the same stimulus as progressive resistance training. This is particularly important during substantial weight loss.

Imagine losing 40 pounds.

Before losing weight, every time you stood up from a chair or climbed stairs, your legs had to move 40 additional pounds. Now those same activities provide less resistance.

That can be wonderful for your joints. But it also means daily activities may no longer challenge your muscles as much as they once did.

Purposeful strength training helps replace that missing stimulus.

Protein + Strength Training: The Combination That Matters

For adults over 50 who are losing significant weight, a useful framework is:

Protein + Strength Training + Daily Movement

Protein

Provides amino acids necessary for maintaining and repairing muscle tissue.

Strength Training

Provides the mechanical stimulus telling your body that muscle and strength are still necessary.

Daily Movement

Supports cardiovascular health, endurance, mobility, metabolic health, and overall physical function.

The ESPEN Expert Group similarly concluded that protein nutrition combined with exercise represents an optimal strategy for maintaining muscle function in older adults².

You don’t have to choose between losing weight and becoming stronger. The goal is to design a strategy that addresses both.

Don’t Forget About the Rest of Your Nutrition

Protein is important. But protein isn’t the only nutrient that matters.

When overall food intake decreases substantially, it becomes important to ensure adequate intake of:

• vitamins
• minerals
• fiber
• essential fatty acids
• fluids
• calcium
• vitamin D
• vitamin B12
• other micronutrients

The 2025 GLP-1 nutrition advisory emphasizes eating a variety of nutrient-dense, minimally processed foods and monitoring for potential nutrient deficiencies during treatment¹.

This is another reason simply saying “Eat more protein” isn’t enough.

The better message is:

Make the smaller amount of food you’re eating nutritionally valuable.

What About Hydration?

Hydration can also become an issue during GLP-1 therapy.

If hunger and thirst cues change or gastrointestinal symptoms occur, some people may unintentionally reduce fluid intake.

Adequate hydration supports:

• normal physiological function
• exercise performance
• digestion
• circulation
• temperature regulation

The joint advisory recommends monitoring hydration along with food intake during GLP-1 treatment¹. For older adults, hydration deserves particular attention because aging itself can alter thirst perception and increase vulnerability to low fluid intake⁴.

Five Practical Protein Strategies During GLP-1 Weight Loss

1. Include Protein at Every Meal

Instead of trying to consume your entire daily protein target at dinner, distribute protein-containing foods throughout the day.

2. Eat the Protein Portion First

If you become full quickly, prioritize the nutrient you are most concerned about consuming adequately.

3. Choose Nutrient-Dense Protein Foods

Fish, eggs, Greek yogurt, cottage cheese, beans, lentils, poultry, nuts, and seeds can provide protein along with other important nutrients.

4. Consider Smaller Meals

If large meals are uncomfortable, smaller meals or snacks containing protein may be easier to tolerate.

5. Pair Protein With Strength Training

Don’t think about nutrition and exercise as separate strategies. Use them together.

How Do You Know If You’re Maintaining Muscle and Strength?

You don’t need to rely exclusively on body-composition testing.

Pay attention to what your body can do. Ask yourself:

• Can I still get out of a chair without pushing with my arms?
• Are stairs becoming easier or harder?
• Can I carry groceries comfortably?
• Can I lift my suitcase?
• Am I walking at the same speed?
• Can I get on and off the floor?
• Am I maintaining my balance?
• Can I still play golf, tennis, or pickleball?
• Can I keep up with my grandchildren?

These are important indicators of physical function.

Because ultimately, preserving muscle isn’t simply about maintaining a number on a body-composition report. It’s about maintaining your ability to live independently and participate in life.

Frequently Asked Questions About Protein and GLP-1 Medications

Why is protein important when taking a GLP-1 medication?

GLP-1 medications can significantly reduce appetite and total food intake. This can make adequate protein consumption more difficult. Protein supplies amino acids needed for maintaining and repairing muscle tissue, making adequate intake particularly relevant during significant weight loss¹.

How much protein should I eat while taking Ozempic, Wegovy, Mounjaro, or Zepbound?

There is no single appropriate target for everyone. The 2025 joint advisory notes that higher protein intakes have been proposed during active weight loss, but recommendations should account for factors such as body composition, age, health conditions, kidney function, and physical activity¹.

Do adults over 50 need more protein?

Many expert groups recommend approximately 1.0–1.2 g/kg/day for healthy older adults, compared with the standard adult RDA of 0.8 g/kg/day²,³. Individual requirements can vary.

Can protein prevent muscle loss from GLP-1 medications?

Protein can support muscle maintenance, but protein alone should not be viewed as sufficient. Structured resistance training is also important¹.

Should I drink protein shakes while taking a GLP-1?

Protein shakes may be helpful if reduced appetite makes it difficult to meet nutritional needs through food alone. However, they should complement — not automatically replace — a nutrient-dense eating pattern.

Should I eat protein before carbohydrates?

If early fullness is preventing adequate protein intake, prioritizing protein-rich foods first during a meal can be a useful strategy¹. This does not mean carbohydrates need to be eliminated.

What if I have kidney disease?

Protein recommendations should be individualized. If you have kidney disease or another medical condition affecting nutritional requirements, discuss your protein intake with your physician and/or registered dietitian.

The Bigger Question: What Do You Want Your Body to Be Able to Do?

Weight loss can be an important health goal.

But particularly after 50, we should be careful not to make the scale the only definition of success.

Imagine losing 40 pounds. Now ask:

• Can you still climb stairs?
• Can you lift your luggage?
• Can you carry groceries?
• Can you get off the floor?
• Can you travel?
• Can you play golf or pickleball?
• Can you keep up with your grandchildren?

Those questions matter.

Protein can help provide the nutritional building blocks necessary to maintain muscle. Strength training provides the physical stimulus that tells your body that muscle is still necessary. Daily movement helps you continue using that strength in real life.

That’s why the conversation around GLP-1 medications after 50 shouldn’t simply be:

“How much weight are you losing?”

It should also include:

“How are you protecting your strength while you lose it?”

The Bottom Line: Don’t Just Eat Less — Eat With Purpose

GLP-1 medications can make eating less considerably easier for many people.

But eating less and eating well aren’t necessarily the same thing.

When your overall food intake decreases, nutrition becomes more important — not less important.

For adults over 50 undergoing significant weight loss, that means paying attention to:

• Protein.
• Overall nutrient quality.
• Hydration.
• Strength training.
• Daily physical activity.
• Muscle and physical function.

The goal isn’t simply to lose pounds. The goal is to reduce excess body fat while maintaining the strength and physical capacity you need for the years ahead.

Remember:

Protein provides the building materials. Strength training provides the signal. Movement puts that strength to work.

And together, they can help shift the goal from simply losing weight to losing weight while staying strong.

Losing Weight? Don’t Forget to Measure Your Strength.

If you’re over 50 and currently experiencing significant weight loss — whether through GLP-1 medication, nutritional changes, or another medically supervised approach — it may be helpful to establish a baseline for your physical function.

At Kriz Mobility and Vitality, we look beyond the scale by evaluating the strength, mobility, balance, and movement capacity necessary for everyday life.

Because the goal isn’t simply to weigh less. It’s to remain strong enough to keep doing what you love.

Move better. Live better. Stay Active for Life.

This article is for educational purposes only and does not replace individualized medical or nutritional advice. Prescription medications should be managed by the prescribing healthcare provider. Protein needs vary, particularly in people with kidney disease and other medical conditions. Consult your physician and/or registered dietitian regarding your individual nutritional needs.

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 (Silver Spring). 2025;33(8):1475–1503. doi:10.1002/oby.24336. This Advisory was concurrently published in the American Journal of Lifestyle Medicine and Obesity Pillars; a correction to the original article was published in Obesity (Silver Spring) in 2026.

2. Deutz NEP, Bauer JM, Barazzoni R, et al. Protein intake and exercise for optimal muscle function with aging: recommendations from the ESPEN Expert Group. Clinical Nutrition. 2014;33(6):929–936. doi:10.1016/j.clnu.2014.04.007.

3. Bauer J, Biolo G, Cederholm T, et al. Evidence-based recommendations for optimal dietary protein intake in older people: a position paper from the PROT-AGE Study Group. Journal of the American Medical Directors Association. 2013;14(8):542–559. doi:10.1016/j.jamda.2013.05.021.

4. Volkert D, Beck AM, Cederholm T, et al. ESPEN practical guideline: Clinical nutrition and hydration in geriatrics. Clinical Nutrition. 2022;41(4):958–989. doi:10.1016/j.clnu.2022.01.024. Emphasizes routine assessment of nutrition and hydration in older adults and individualized, multimodal interventions.

5. Bauer JM, Diekmann R. Protein and Older Persons. Clinics in Geriatric Medicine. 2015;31(3):327–338. doi:10.1016/j.cger.2015.04.002.