21 Nov Weight Loss, GLP-1s, and Muscle:Why Strength and Nutrition Matter
In 2024, obesity became the leading contributor to Australia’s burden of disease, linked to reduced life expectancy and significantly increasing the risk of chronic conditions such as cardiovascular disease, type 2 diabetes, chronic kidney disease, and several cancers.
The good news? Many of these complications can be prevented with weight loss! In recent years we have seen a dramatic rise in the prescription of weight‑loss medications such as Ozempic, Mounjaro, and Wegovy, offering a powerful tool to help with weight loss.
There is no denying these drugs are highly effective at reducing fat, however they are only one part of the weight‑loss equation. Research shows that 20–40% of the weight lost may actually come from fat-free mass — which includes your muscles. That’s a big deal, because keeping your strength is just as important as reducing fat. Without a plan to protect lean tissue, weight loss can come at the cost of bone health, muscle mass, and independence.
Preserving strength and lean tissue therefore requires resistance exercise and dietitian-guided nutrition, ensuring that weight loss improves overall health and reduces the risk of these complications.
Why Muscle Mass Matters
Muscle is one of the most important predictors of long-term health. Being strong helps you move with ease, maintain independence, and stay active as you age. Beyond strength, healthy muscle supports your metabolism, regulates blood sugar, reduces inflammation, and protects your bones. It’s essential for independence, mobility, and overall health.
We naturally lose muscle as we get older — around 3–5% each decade from age 30. And it’s not just about the amount of muscle you have, but also the quality. In people who are overweight or obese, muscles often contain more fat and work less efficiently. This means strength and mobility can already be lower before weight loss begins.
When you combine this with the muscle loss that can occur during weight loss (whether through diet, surgery, or medications), the risk of frailty, falls, fractures, and reduced quality of life increases. The good news? You can do something about it.
Resistance Exercise Protects Muscle
Resistance exercise is the gold standard for keeping muscle while you lose weight. Research consistently shows that when resistance training is included in a weight loss program, almost all muscle loss can be prevented while still achieving significant fat loss.
Here’s what works best:
- Frequency: 2–3 sessions per week
- Focus on all major muscle groups: legs, back, chest, arms, core
- Progress gradually by increasing weight over time.
The most important thing is to be consistent. Working with an exercise physiologist means you’ll have a safe, effective, and personalised program designed around your goals and needs.
The Importance of GOOD Nutrition
Adequate nutrition is just as important as resistance exercise for preserving muscle and bone. Weight-loss drugs suppress appetite, making the nutrient quality of your meals even more important. Working with an accredited dietitian can help you:
- Plan meals that meet protein and nutrient needs
- Ensure you get the vitamins and minerals your body requires to support overall health, including hair, skin, brain function, energy, and immunity
- Support overall energy and nutrient adequacy while losing weight
- Ensure that weight loss preserves muscle, maintains bone health, and supports strength for daily activities
Together, resistance exercise and dietitian-guided nutrition provide the foundation for safe, effective weight loss with GLP‑1 medications, helping you to reduce fat while maintaining strength, function, and long-term health.
The Takeaway
GLP-1 medications can be an excellent tool for weight loss, but they’re not the whole solution. Protecting muscle is just as important as reducing fat. The way to do that is clear:
1. Strength training 2–3 times per week
2. Adequate protein and nutrient intake with dietitian guidance
3. Tracking progress beyond the scale — focus on how strong, mobile, and energised you feel
If you’re considering or already using GLP-1 medications, pairing them with the right exercise and nutrition plan is the key to long-term success. Now is the perfect time to protect your strength, health, and independence — and we’re here to help you do it.