The weight is finally coming off. Your blood sugar looks better. Your appetite is quiet for the first time in years. But you may also notice that you feel weaker on the stairs, your hair seems thinner, you are constipated, or you can barely eat enough to get through the day.
GLP-1 medications like semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound) can be life-changing tools. I am not here to talk you out of them. I am here to help you use them well, so you lose fat, not your health.
How GLP-1 Medications Work
These medications mimic gut hormones that:
- Reduce appetite and increase fullness
- Slow stomach emptying
- Improve insulin release and blood sugar control
That is exactly why they work, and also why they create new risks. When you eat much less, it becomes easy to fall short on protein, fiber, fluids, vitamins and minerals.
The Muscle Question
Any time you lose weight, part of it is lean mass, which includes muscle. Studies of GLP-1 therapy have found that lean mass loss can range from roughly a quarter to well over a third of total weight lost, depending on how it is measured.
Newer data presented at the 2026 European Congress on Obesity add helpful nuance. In real-world patients who also received exercise counseling, most of the weight lost was fat, and relative muscle mass held steady or improved in most people. But compared with diet and exercise alone at the same amount of weight loss, GLP-1 users still lost somewhat more muscle.
The takeaway: muscle loss on GLP-1s is not inevitable, but it is not automatic protection either. It depends heavily on what you eat and how you move.
This matters most if you are over 50, already have low muscle mass, or have osteoporosis or osteopenia. Muscle protects your metabolism, blood sugar, balance and independence as you age.
Five Ways to Protect Your Body on a GLP-1
1. Prioritize protein at every meal
Protein is the single most important nutrient for preserving muscle while losing weight. Aim for a palm-sized serving or more at each meal, and eat your protein first, before you feel full. Many people benefit from a clean protein shake when appetite is very low. I individualize protein targets based on body size, kidney function and goals.
2. Strength train at least two to three times a week
Resistance exercise is the strongest signal you can send your body to keep muscle. Bands, weights, machines or bodyweight exercises all count. Walking is great, but it does not replace strength work.
3. Don’t neglect fiber and fluids
Constipation is one of the most common side effects. Include cooked vegetables, chia or ground flaxseed, and gentle fiber supplements if needed. Drink water consistently throughout the day.
4. Watch for nutrient gaps
When food intake drops, deficiencies can develop. I commonly check:
- Vitamin B12 and folate, especially if you also take metformin
- Iron and ferritin (low levels can contribute to hair thinning and fatigue)
- Vitamin D
- Magnesium and potassium
- Zinc
5. Support your gut
Slowed stomach emptying can cause nausea, reflux and bloating. Smaller meals, eating slowly, avoiding greasy food and not lying down after eating can help. Ginger can ease nausea for some people.
How I Support Patients on GLP-1 Therapy at Good News Naturopathic Clinic
I work alongside your prescribing doctor. My role is to protect the rest of your health:
- Body composition tracking to monitor fat versus lean mass over time
- Comprehensive nutrient panel
- Metabolic labs — fasting insulin, glucose, HbA1c, lipids
- Thyroid panel, since fatigue is common
- Comprehensive stool testing (such as the GI-MAP) if digestive symptoms persist
- A personalized protein, fiber and strength plan
Ready to Lose Weight the Healthy Way?
GLP-1 medications are powerful tools. A plan around them makes them work better and protects you for the long term. I see patients in person in Norwalk, CT, serving Fairfield County and the NYC metro area, and by telehealth for Connecticut residents.
Book your consultation with Dr. Jamie Ahn today.
Related Reading
Frequently Asked Questions
How much protein should I eat on Ozempic?
Needs vary by body size, age and kidney health. Many adults losing weight benefit from more protein than the minimum recommended amount. I set targets individually.
Does Ozempic cause hair loss?
Hair shedding can happen with rapid weight loss of any kind, often linked to low protein, iron or other nutrients. Checking these levels is a good first step.
Can I take supplements with GLP-1 medications?
Many are safe, but some can affect blood sugar. Always tell your prescriber and me what you take.
Do I still need to exercise if the medication is working?
Yes. Strength training is the main way to protect muscle and bone while losing weight.
References
- Epocrates. GLP-1s spare muscle, but less so than diet, exercise (European Congress on Obesity 2026 coverage). https://www.epocrates.com/online/article/glp-1s-spare-muscle-but-less-so-than-diet-exercise
- ClinicalTrials.gov. Combatting Muscle Loss in Obese Adult Patients on GLP-1 Medications Through Dietary Counseling and Exercise (NCT07554417). https://clinicaltrials.gov/study/NCT07554417
This article is for educational purposes only and is not a substitute for individual medical advice.
