The 3-things You Can Do To Preserve Your Lean Muscle Mass While Taking a GLP-1 Medication

GLP-1 medications have helped many people improve their health, manage blood sugar, and support weight loss. While these medications can be effective tools, it’s important to make sure weight loss is happening in a way that supports your overall health—including preserving muscle mass.

Because GLP-1 medications often reduce appetite, some people may unintentionally eat too little protein or not eat consistently throughout the day. Over time, this can increase the risk of muscle loss alongside fat loss.

The good news? There are ways to support your body and protect muscle while taking a GLP-1 medication.

Why Muscle Matters

When weight loss happens, regardless if through dieting, surgery or medication- you will often lose a combination of both fat and muscle. Clinical trials have shown people who take weight loss medication often lose 15% to 20% of their body weight. Research studies suggest that GLP-1 medications may lead to significant muscle loss—sometimes up to 25–40% of total weight lost. That means if someone loses 20 pounds, 6–8 of those pounds might be muscle mass.

Muscle does much more than help with strength or exercise performance. Healthy muscle mass supports:

• Metabolism and energy use
• Blood sugar regulation
• Balance and mobility
• Daily function and independence
• Long-term weight maintenance

Preserving muscle during weight loss can help you feel stronger, more energized, and better supported overall.

Follow these top 3 things if you want to preserve your muscle mass while on your weight loss journey.

1. Consume Adequate Protein

Protein plays a major role in maintaining and repairing muscle tissue. When your body is losing weight, getting enough protein helps signal to the body to preserve muscle rather than break it down for energy.

Without enough protein, the body may lose muscle more easily during weight loss.

How Much Protein Do You Need to Prevent Lean Muscle Mass Loss?

Protein needs vary from person to person depending on factors like age, activity level, medical history, and body size. In general, many people taking GLP-1 medications benefit from a higher protein intake than they may expect.

A commonly recommended range for preserving muscle during weight loss is:

• Around 20–30 grams of protein per meal– spaced out, you can only efficiently absorb 35-40 grams per meal.

• It is recommended to consume 1.2 to 2.0 grams of protein per kilogram of body weight.

However, your individual needs may be higher or lower depending on your goals and health needs. To understand your protein needs, you can book an assessment for as little as $0!

One of the biggest mistakes people make during weight loss is not eating enough protein, which can lead to loss of lean muscle mass instead of primarily body fat. Preserving muscle is important for maintaining metabolism, supporting daily function, improving recovery, and helping you feel stronger throughout your journey.

Working with a registered dietitian can help ensure you’re getting the right amount of protein for your individual needs, lifestyle, activity level, and goals. Rather than following restrictive trends or guessing, a dietitian can help you build balanced meals that support sustainable weight loss while protecting lean muscle mass.

Where to get your protein from?

Complete proteins contain all nine essential amino acids your body needs to support muscle repair, energy, hormones, and overall health. Foods like eggs, dairy, fish, poultry, soy, and quinoa are considered complete proteins, while some plant proteins can be paired together throughout the day to create a balanced amino acid profile.

Including quality protein sources in meals and snacks can help support fullness, preserve lean muscle mass, and keep your body functioning at its best.

List of Animal Proteins

Convenient Protein Options

Sometimes appetite is low on GLP-1 medications, making convenience important. These can be especially helpful on days when full meals feel difficult.

Protein Source	Grams of Protein Per Serving
Protein Shakes	30 g
Smoothies	5 g
Protein Bars	12 g
Drinkable Yogurts	10 g

How Do I Get Enough Protein Throughout the Day?

One of the biggest challenges on GLP-1 medications is reduced appetite. Waiting until the end of the day to “catch up” on protein usually doesn’t work well.

Instead, focus on spreading protein throughout the day.

Aim for Protein at Each Meal

Even smaller portions can add up when protein is included consistently. Keeping meals simple often works best.

Helpful Strategies:

• Build meals around protein first
• Keep easy options available
• Prepare protein ahead of time
• Pair protein with carbohydrates and healthy fats
• Use reminders to eat regularly if appetite is very low
  

Easy Protein Boost Ideas

• Add Greek yogurt to smoothies
• Keep hard-boiled eggs on hand
• Use protein milk in coffee or oatmeal
• Add beans to soups or salads
• Keep protein shakes available for busy days

The goal is consistency—not perfection.

2. Build New Muscle

Nutrition is only one piece of the puzzle. Resistance training or strength-based movement helps tell the body to hold onto muscle during weight loss.

This can include:

• Dumbbells
• Resistance bands
• Bodyweight exercises
• Pilates
• Strength machines

You do not need intense workouts to benefit—consistency matters more than perfection.

Our Get Move Program is designed to help you build sustainable movement habits with guidance and support that meets you where you are. Combined with nutrition counseling, we help clients on GLP-1 medications create balanced routines that support healthy weight loss while protecting muscle mass and overall health.

3. Monitor Muscle Mass

While weight alone can’t tell the difference between muscle, fat, water, or bone mass, body composition testing gives a clearer picture of how much lean muscle mass you have and how it changes over time.

Tools like body composition scans can help identify whether progress is coming from fat loss versus muscle loss, allowing for more personalized nutrition and exercise recommendations. Below are some at home friendly tools that can help track your weight loss progress and show you how much lean muscle your are preserving.

• Budget friendly – Smart Scale from Amazon
• Middle of the road – Tanita 
• Best of the best – InBody

How Do I Know If I’m Losing Muscle?

Don’t want to buy another scale!? No worries- you don’t have to! Schedule a time to come by either our Gilbert or Downingtown office and we can asses your muscle mass for FREE!

GLP-1 medications can be helpful tools, but preserving muscle is an important part of supporting your long-term health. Prioritizing protein, eating consistently, strength training, and building sustainable habits can help protect your muscle mass while supporting your goals.

If you’re taking a GLP-1 medication and feeling unsure about what or how much to eat, working with a registered dietitian can help you create a personalized plan that supports both your nutrition needs and your overall well-being.

Disclosure:
This post may contain affiliate links, including links to products from Thorne and Amazon. As a Thorne and Amazon affiliate, Anderson’s Nutrition may earn a small commission from qualifying purchases made through these links at no additional cost to you. We only recommend products we genuinely trust and believe may be beneficial for our patients and community.