GLP-1 medications have become one of the biggest health topics in recent years. You have probably heard names like Ozempic, Wegovy, Rybelsus, Trulicity or Mounjaro pop up in conversations around diabetes, appetite control and weight loss.
They can be very effective. They can also create some important questions.
At PhysioHealth, one of the big questions we care about is this:
How do we help people lose weight while protecting their strength, muscle, energy and long term health?
Because weight loss is not just about the number on the scales. It is about what that weight is made of.
GLP-1 receptor agonists are medications that act like a natural hormone produced in the gut. This hormone helps regulate blood glucose, appetite, digestion and insulin release.
In simple terms, these medications can help people feel fuller, eat less and improve blood sugar control.
They are commonly used for:
Some of the most recognised medications include semaglutide, dulaglutide and tirzepatide.
GLP-1 medications work through a few clever pathways. They:
The result is often reduced hunger, reduced energy intake and weight loss.
For many people, this can be life changing. Improved blood sugar control, reduced body weight, better cardiovascular risk factors and improved metabolic health are all important wins.
But there is one part of the story that deserves more attention.
When people lose weight quickly, they do not just lose body fat. Some of the weight lost may also come from lean mass, including muscle.
This matters because muscle is not just there to make you look strong in a mirror. Muscle is one of the most important tissues in the body for health, function and independence.
If we lose too much muscle during weight loss, we may end up lighter on the scales but less strong, less resilient and more vulnerable to fatigue, falls or injury.
This is especially important for older adults, people with low baseline strength, people with cancer, people recovering from illness and anyone already at risk of sarcopenia or low bone density.
At PhysioHealth, we are all for effective weight loss when it is medically appropriate. We just want the weight loss to come with a plan to keep the body strong.
GLP-1 medications may help reduce appetite and support weight loss, but they are not a complete health plan on their own.
To protect muscle, you need the right stimulus. That means resistance training.Not random exercises. Not just walking. Not just stretching. Proper strength training that is matched to the person, progressed over time and adjusted based on symptoms, confidence and goals.
A good program may include:
The goal is not simply to lose weight. The goal is to improve body composition.
That means reducing excess fat while maintaining or building muscle.
Another important piece of the puzzle is what happens if someone stops taking the medication.
Without lifestyle changes, many people regain weight after stopping. The tricky part is that the regained weight may be more likely to return as fat rather than muscle.
That means body composition can potentially worsen over time if strength training, nutrition and long term habits are not part of the plan.
This is why a multidisciplinary approach matters.
Medication may help create the opportunity. Exercise, nutrition and behaviour change help protect the result.
There is emerging interest in the relationship between GLP-1 medications, metabolic health and cancer outcomes.
We know that type 2 diabetes, obesity, chronic inflammation and elevated insulin levels are linked with higher risk for some cancers. Improving metabolic health may therefore have important broader health benefits.
Early research is also exploring whether GLP-1 medications may influence cancer risk or tumour behaviour. Some animal studies suggest possible benefits in certain cancer models, but this area is still developing.
The important point is this:
Association does not equal causation.
GLP-1 medications are not cancer treatments. They should not be viewed that way. Any use in people with cancer needs to be carefully considered by the medical team.
For people with cancer, muscle loss is a major concern.
Cancer cachexia is a complex condition involving severe muscle and weight loss. It can reduce treatment tolerance, increase fatigue and impact overall outcomes. It is not simply fixed by eating more.
This is where caution is needed.
If a person with cancer is already losing weight, losing appetite or losing muscle, then adding a medication that suppresses appetite may not be appropriate without careful medical guidance.
For these patients, exercise and nutrition support become even more important.
The goal is not just weight management. The goal is preserving strength, function and treatment resilience.
If you are taking a GLP-1 medication, or considering one, here are the big things to think about.
Do not only track body weight. Consider strength, energy, function, waist measurements and body composition where possible.
Prioritise protein intake. Speak with your GP or dietitian about what is appropriate for you.
Start resistance training early. Do not wait until you feel weak.
Progress gradually. The right amount of exercise should challenge you without wiping you out.
Get support if you have cancer, diabetes, osteoporosis, a history of falls, pain or other medical conditions.
The best outcomes usually come when medication is combined with a proper lifestyle plan.
At PhysioHealth, we help people build strength and confidence while managing weight loss, medical conditions and lifestyle change. Our exercise physiologists can help you:
GLP-1 medications may help change appetite and weight. Exercise helps change what your body can do. And that is the part we really care about.
GLP-1 medications can be powerful tools, but they work best when they are part of a bigger plan.
Weight loss without strength can leave people feeling smaller but not necessarily healthier.
Weight loss with strength training, good nutrition and the right support can help people become lighter, stronger, more confident and more resilient.
That is the goal.
If you are using a GLP-1 medication and want to protect your muscle, energy and long term health, we can help you build the plan around it.
