Understanding Sarcopenia: Why Lifting Weights Matters While on Your GLP-1 Medication

What is sarcopenia?

Sarcopenia is a condition where your muscles gradually lose size and strength. It happens naturally as we age, but it can speed up with inactivity, poor nutrition, or rapid weight loss. Sarcopenia increases the risk of falls, fractures, loss of independence, and even early death.

Why does this matter while taking your GLP-1 medication?

Your GLP-1 medication (such as Ozempic, Wegovy, Mounjaro, or Zepbound) is very effective at helping you lose weight. However, not all the weight you lose is fat — some of it comes from muscle. If you don't take steps to protect your muscles, you could lose important strength and function over time.

The solution: Lift weights (resistance training)

Resistance training — also called strength training or weight lifting — is the single best way to protect and build your muscles. It works by stimulating your muscles to grow stronger and bigger, even while you are losing weight.

How much should you do?

• Aim for 2 to 3 sessions per week of resistance training
• Each session should last about 30 to 45 minutes
• Work both your upper body (arms, shoulders, chest, back) and lower body (legs, hips, glutes)
• Perform 1 to 3 sets of 6 to 12 repetitions per exercise
• Use a weight or resistance that feels challenging by the last few repetitions
• Gradually increase the weight or resistance over time as you get stronger

What counts as resistance training?

• Free weights (dumbbells, barbells)
• Weight machines at a gym
• Resistance bands
• Bodyweight exercises (squats, push-ups, planks, lunges)

Don't forget aerobic exercise too

In addition to lifting weights, aim for at least 150 minutes per week of moderate-intensity aerobic activity, such as brisk walking, cycling, or swimming. This helps your heart, metabolism, and overall health.

Eat enough protein

Your muscles need protein to repair and grow. While on your GLP-1 medication, your appetite may be reduced, making it harder to eat enough. Try to:

• Eat protein-rich foods first at each meal
• Aim for a palm-sized portion of protein at every meal (about 25–30 grams per meal)
• Good sources include: eggs, Greek yogurt, cottage cheese, fish, chicken, beans, lentils, nuts, and tofu
• If you struggle to eat enough, consider a protein shake or supplement
• Your doctor may recommend a specific daily protein target based on your weight (typically 1.2–1.5 grams per kilogram of body weight per day)

Tips for getting started safely

• Start slowly and build up gradually, especially if you are new to exercise
• If you feel nauseous from your medication, avoid intense exercise right after eating
• Consider working with a physical therapist or certified trainer, especially at first
• Stay hydrated — this is extra important while on GLP-1 medications
• Tell your doctor if you notice any new weakness, difficulty with balance, or frequent falls

Key takeaways

• Your GLP-1 medication helps you lose fat, but you need to actively protect your muscles
• Lifting weights 2–3 times per week is the most important thing you can do
• Eating enough protein every day supports muscle health
• Staying active helps you maintain independence, prevent falls, and feel stronger

Bianca Camille Fong APRN, FNP-BC