If you are using GLP-1 medication (such as Ozempic, Wegovy, or Mounjaro), you will effectively lose weight, but without the right approach, you will also lose muscle mass. You want to prevent that. The solution is concrete: eat at least 1.6 grams of protein per kilogram of body weight per day and strength train 2–3 times a week.
On this page, you'll find everything you need: why muscle mass matters, how much protein you need, how to achieve that if you have little appetite, and which products can help. This is not an advertisement for a medication. It is practical support for you if you are already using it.
Why you lose muscle mass with GLP-1 medication
GLP-1 medication strongly suppresses your hunger. You eat less — sometimes much less. This creates a significant calorie deficit, and your body responds by not only burning fat but also breaking down muscle tissue for energy. Scientific research shows that with GLP-1 use, 25–40% of the lost weight can consist of fat-free mass (including muscle).
That sounds technical, but the consequences are very practical:
- Less muscle mass = lower resting metabolism
- Lower metabolism = faster weight gain if you stop the medication
- Less strength, more fatigue, higher risk of injuries
The good news: this is largely preventable. With two levers — enough protein and regular strength training.
How much protein do you need with GLP-1?
The guideline for people actively losing weight with GLP-1 medication: at least 1.6 grams of protein per kilogram of body weight per day.
Practical example:
- 70 kg → at least 112 grams of protein per day
- 80 kg → at least 128 grams of protein per day
- 90 kg → at least 144 grams of protein per day
That's a lot — especially if you have little appetite. That's why compact, protein-rich options are so important. Read more in: How much protein do you need with GLP-1 / Ozempic?
The practical challenge: little hunger, yet enough protein
This is precisely the problem. You hardly feel hungry anymore, but your muscles still need those proteins. Large meals are no longer an option. What works then?
Small, protein-rich, and easily digestible choices:
- Quark or Greek yogurt (20–25 g protein per serving)
- Eggs (6–8 g protein per egg)
- Chicken fillet or tuna (25–30 g protein per 100 g)
- A compact meal shake — such as the Killerbody Meal Shake, which provides approximately 28g of protein per serving as a complete meal replacement
- Protein Water for in-between meals — light, refreshing, yet 20+ g protein
Read more: What to eat if you have little appetite or nausea due to GLP-1?
Strength training: the second pillar
Eating protein is one thing. But your body also needs a reason to retain that muscle. Strength training sends that signal. You don't have to become a top athlete: 2–3 targeted sessions per week are enough.
Think squats, lunges, push-ups, rows with resistance bands. At home or in the gym — both work.
More detail: Preventing muscle loss during weight loss with Ozempic
Is a meal replacement useful with GLP-1?
Yes — provided you choose one that is truly complete. A good meal replacement for GLP-1 use has:
- At least 25–30 g of protein per serving
- A complete amino acid profile (essential for muscle retention)
- Vitamins and minerals (because you eat less, so micronutrient deficiencies occur more quickly)
- A light, easily digestible texture
The Killerbody Meal Shake was specifically developed for this: compact, protein-rich, plant-based, and without added sugars. Read more: Is a meal replacement useful with GLP-1?
And after stopping? How to prevent the yo-yo effect
Many people who stop GLP-1 medication regain (some) weight. This is not a lack of willpower – your hunger hormones return to their old levels. But if you have maintained your muscle mass during treatment, you start with a higher resting metabolism and a stronger foundation. That makes all the difference.
More on this: Maintaining weight after stopping GLP-1
Summary: the three steps
- Eat enough protein — at least 1.6 g per kg of body weight per day, spread throughout the day
- Strength train — 2–3 times a week, even if it's light
- Choose compact, protein-rich options — a Meal Shake or Protein Water helps when large meals are not possible
GLP-1 medication is a powerful tool. You complete it by using it wisely.
