The GLP-1 Conversation We're Not Having
10 Things I Want to Share about Ozempic, Wegovy or Zepbound
Ozempic. Wegovy. Zepbound.
A few years ago, most people had never heard these names. Today, GLP-1 medications have become part of everyday conversations about weight, diabetes, menopause, insulin resistance and metabolic health.
And there is good reason for the attention.
For appropriately selected patients, these medications represent one of the most significant advances we have seen in the treatment of obesity and cardiometabolic disease.
But here is what concerns me: Prescribing has moved much faster than patient education.
Maybe you had 15 minutes with your physician. Maybe a friend told you about their experience. Or maybe most of what you know has come from TikTok, Instagram or Google.
As a Registered Dietitian and Certified Diabetes Educator, I see a major gap between receiving a prescription and understanding how to use these medications while protecting your nutrition, muscle, bone and long-term metabolic health.
And this conversation goes well beyond weight.
It may be the woman entering perimenopause whose waist circumference and cholesterol are suddenly increasing. It may be someone managing PMOS, insulin resistance, prediabetes, fatty liver, elevated blood pressure or sleep apnea. Or it may simply be the person sitting across from me saying:
“I'm already eating well. I'm exercising. I'm restricting more and more. Why am I still stuck?”
Weight regulation is far more complicated than willpower. So before we get into the research, let's talk about how I really feel about these medications.
HOW I REALLY FEEL
As a dietitian, I am not “for” or “against” GLP-1 medications. I am for finding the approach that makes the most sense for the person sitting in front of me.
I believe in nutrition strategies that are sustainable for life, not another cycle of restriction, weight loss and regain. Your plan should be flexible enough to work whether you're at home, travelling, navigating menopause, raising a family or simply going through a busier season of life.
I also believe in looking deeper when someone is doing the work and their body isn't responding as expected. Weight and metabolic health are influenced by much more than willpower. Depending on the individual, we may need to consider insulin resistance, menopause, PMOS, medications, sleep, appetite regulation, family history, medical conditions and genetic susceptibility.
And before simply adding another medication, I want to look at the whole cardiometabolic picture. Could one appropriately selected intervention improve several interconnected concerns? And if someone's metabolic health improves significantly, could some of their existing medication needs eventually be reassessed by their prescribing clinician?
WHAT I BELIEVE IN
Sustainable nutrition, not another temporary diet
No more yo-yo cycle of restrict, lose, regain, repeat
A deeper look at the metabolic and medical drivers of weight
Preserving muscle, bone and nutritional health
Treating the whole person, not just the number on the scale
Using medication when appropriate, without allowing it to replace nutrition
Giving people better tools, better understanding and more confidence in their health
I am not interested in medication versus nutrition. I am interested in using the right evidence-based tools, for the right person, at the right time.
The goal is to build a healthier, stronger and more sustainable way forward.
FIRST: WHAT EXACTLY IS A GLP-1?
GLP-1 stands for glucagon-like peptide-1, a hormone naturally released by the gut after eating. Among its actions, it helps regulate blood glucose, influences appetite and satiety, and slows gastric emptying.
The medications you've probably heard about work in slightly different ways:
Ozempic and Wegovy contain semaglutide, a GLP-1 receptor agonist.
Zepbound contains tirzepatide, which acts on both GIP and GLP-1 receptors.
For many of my patients, one of the most remarkable effects isn't simply eating smaller portions.
It's hearing:
“For the first time, I'm not thinking about food all day.”
That reduction in hunger and “food noise” can create an incredible therapeutic opportunity.
But this is also where the nutrition conversation begins.
Appetite suppression and optimal nutrition are not the same thing.
OZEMPIC VS. WEGOVY VS. ZEPBOUND
Here are the basics:
OZEMPIC
Medication: Semaglutide
Class: GLP-1 receptor agonist
Frequency: Weekly injection
Starting dose: 0.25 mg
Typical progression: 0.25 → 0.5 → 1 → up to 2 mg
Primary Canadian role: Type 2 diabetes
WEGOVY
Medication: Semaglutide
Class: GLP-1 receptor agonist
Frequency: Weekly injection
Starting dose: 0.25 mg
Typical progression: 0.25 → 0.5 → 1 → 1.7 → 2.4 mg
Primary role: Chronic weight management
Major trial result: Approximately 15% average weight loss at 68 weeks in STEP 1
ZEPBOUND
Medication: Tirzepatide
Class: GIP + GLP-1 receptor agonist
Frequency: Weekly injection
Starting dose: 2.5 mg
Typical progression: 2.5 → 5 → 7.5 → 10 → 12.5 → 15 mg
Primary role: Chronic weight management
Major trial result: Approximately 15–21% average weight loss at 72 weeks in SURMOUNT-1
Important: These are clinical-trial averages, not guarantees, and the numbers should not be interpreted as direct drug-to-drug comparisons. Ozempic and Wegovy also contain the same active medication but have different indications and dosing.
1. YES, THE WEIGHT LOSS CAN BE SUBSTANTIAL
Let's start with the numbers that changed the conversation.
In the STEP 1 trial, adults with overweight or obesity without diabetes who received semaglutide 2.4 mg plus lifestyle intervention lost an average of 14.9% of their starting weight over 68 weeks, compared with 2.4% with placebo. Approximately half lost at least 15% of their starting weight.
Tirzepatide also produced substantial average reductions in SURMOUNT-1:
15.0% at 5 mg
19.5% at 10 mg
20.9% at 15 mg
At the two higher doses, approximately half or more of participants lost at least 20% of their starting weight
Those are impressive numbers.
But they are averages, not promises. Some people lose considerably more. Others lose considerably less.
DIETITIAN PEARL
If your weight loss is slower than a clinical-trial average, my first response isn't automatically “eat less.”
I want to look at:
Overall food quality and energy intake
Protein intake
Resistance training and activity
Sleep
Medications
Menopause or PMOS
Metabolic health
Whether further restriction is actually appropriate
TAKEAWAY
GLP-1s can produce clinically significant weight loss, but your health should never be graded against a clinical-trial average.
2. THE BENEFITS CAN GO WELL BEYOND WEIGHT
This is one of the most exciting parts of the GLP-1 conversation. Depending on the medication and population studied, GLP-1-based therapies have demonstrated benefits involving blood glucose, cardiovascular risk, kidney outcomes, blood pressure, sleep apnea and other cardiometabolic outcomes.
For example, semaglutide 2.4 mg has been associated with meaningful blood-pressure reductions. An individual-patient meta-analysis involving more than 3,100 participants found systolic blood pressure decreased by approximately 5 mmHg more than placebo. Some participants also required less intensive antihypertensive therapy.
Does that mean you should replace your blood-pressure medication with a GLP-1?
Absolutely not.
It means that as someone's metabolic health changes, medication requirements may also change. That is something the prescribing clinician should reassess over time.
DIETITIAN PEARL
Don't only track pounds. Depending on your health history, I may also want to follow:
Waist circumference
Blood pressure
Glucose and HbA1c
Lipids
Liver health
Strength and fitness
Sleep
Body composition
TAKEAWAY
For the right patient, one intervention may influence several interconnected cardiometabolic risks. Weight is only one piece of that picture.
3. THE GLP-1 CONVERSATION GOES BEYOND WEIGHT
Not everyone considering a GLP-1 wants or needs to lose 50 or 100 pounds.
I increasingly meet people who tell me:
“I've gained 15 or 20 pounds over the last several years. My waist is increasing, my cholesterol is creeping up, and what used to work isn't working anymore.”
Medication eligibility still needs to be based on approved indications and an individualized medical assessment.
But as a dietitian, I don't assess metabolic health using weight alone.
I also care about:
Waist circumference and visceral adiposity
HbA1c and glucose
Blood pressure
Lipids
Fatty liver
Sleep apnea
PMOS
Family history
Muscle mass and strength
Weight trajectory
Overall cardiovascular risk
Sometimes the more useful question isn't simply:
“How much do you weigh?”
It's: “Where is your metabolic health heading?”
TAKEAWAY
Weight is one measurement. Metabolic health is the bigger picture.
4. MENOPAUSE, PMOS + INSULIN RESISTANCE DESERVE A SEAT AT THE TABLE
One of the most common things I hear from women in their 40s and 50s is:
“I'm eating the same way, but my body isn't responding the same way.”
There is biology behind that experience.
Aging contributes to changes in body weight and composition, while the menopause transition is associated with changes in fat distribution, visceral adiposity and lean tissue.
This doesn't mean menopause makes weight management impossible. It means the conversation needs to be more sophisticated than simply telling women to eat less.
Newer expert guidance around incretin-based therapies in peri- and postmenopausal women emphasizes looking beyond weight to cardiometabolic health, visceral adiposity, skeletal muscle, fracture risk, adequate protein and resistance exercise. Menopause-specific GLP-1 research is still more limited than the broader obesity literature, so this is an area we need to continue watching closely.
PMOS, polyendocrine metabolic ovarian syndrome, also deserves attention. This is the newer terminology for the condition historically known as PCOS and reflects its broader endocrine and metabolic features.
Research has found that GLP-1 receptor agonists can reduce body weight, BMI and waist circumference in women with the condition, although that certainly doesn't mean these medications are appropriate for everyone with PMOS.
FOR MY MIDLIFE CLIENTS, I WANT TO THINK BEYOND “WEIGH LESS”
I want to:
Preserve muscle
Protect bone
Reduce visceral adiposity
Improve insulin sensitivity
Support cardiovascular health
Maintain strength and function
That is why protein, resistance training, calcium, vitamin D, sleep and overall dietary quality become so important.
TAKEAWAY
Menopause and PMOS remind us that biology matters. More restriction isn't always the answer.
5. LOSING WEIGHT AND LOSING FAT ARE NOT THE SAME THING
This is one conversation I wish happened before every prescription.
When someone loses a substantial amount of body weight, they don't lose exclusively body fat. Some lean tissue is typically lost as well.
In the SURMOUNT-1 body-composition substudy, approximately 75% of the weight lost was fat mass and 25% was lean mass.
That does not mean GLP-1 medications uniquely “eat your muscle.”
Lean mass loss can occur during substantial weight loss through many approaches.
What it does mean is that muscle preservation should be part of the plan from day one.
MYTH BUSTER
MYTH: “Ozempic destroys your muscle.”
A more accurate statement is that substantial weight loss generally includes some loss of lean mass. Our job is to minimize unnecessary loss.
MY MUSCLE-PRESERVATION FOUNDATION
Protein throughout the day
Progressive resistance training, ideally at least twice weekly when appropriate
Adequate overall nutrition
Avoiding extreme calorie restriction
Monitoring strength and function, not only body weight
TAKEAWAY
The goal isn't simply to become lighter. The goal is to preferentially lose fat while preserving strength, muscle and function.
6. EATING LESS DOES NOT AUTOMATICALLY MEAN EATING BETTER
This may be the biggest nutrition issue I see in practice.
Someone tells me: “It's working amazingly. I'm barely hungry.”
Then I discover they've had coffee, half a protein shake and dinner.
That isn't automatically a win.
When food intake drops substantially, so does the opportunity to consume enough protein, fibre, calcium, iron, B12, folate, vitamin D, essential fats, fluids and other important nutrients.
One important clarification: we do not currently have strong evidence that GLP-1 medications broadly cause malabsorption of calcium, iron and B12.
The more established concern is often much simpler: You're eating less food.
And that means the food you do eat needs to work harder nutritionally.
MY GLP-1 PLATE
When appetite is limited, I often keep the order very simple:
Protein first: eggs, Greek yogurt, cottage cheese, fish, poultry, lean meat, tofu, tempeh, edamame or legumes
Vegetables and fruit: colour, fibre, antioxidants and micronutrients
High-fibre carbohydrates as appropriate: beans, lentils, oats, barley, quinoa, fruit, sweet potato and intact whole grains
Healthy fats: extra-virgin olive oil, avocado, nuts, seeds and tahini
This naturally fits beautifully within a Mediterranean-style eating pattern, which remains one of my favourite foundations for cardiometabolic health.
TAKEAWAY
When appetite becomes smaller, nutrition needs to become smarter. Every bite has to work a little harder.
7. PROTEIN MATTERS, BUT PROTEIN ALONE ISN'T ENOUGH
Protein has become one of the biggest nutrition conversations around GLP-1s, and appropriately so. When appetite decreases, protein intake can easily decrease with it.
But here's the part I don't want people to miss:
Protein without resistance exercise isn't the complete muscle-preservation strategy.
Rather than eating almost no protein all day and trying to make it up at dinner, I generally prefer protein distributed throughout the day.
For many of my patients, a practical starting point is approximately 20–30 grams at meals, individualized based on age, body size, activity, kidney function, medical history and total requirements.
Think:
Breakfast: eggs + Greek yogurt, cottage cheese, tofu scramble or a protein smoothie
Lunch: chicken + chickpeas, tuna + white beans, tofu + edamame
Snack: Greek yogurt, cottage cheese, edamame or another protein-rich option
Dinner: fish, poultry, lean meat, tofu, tempeh or legumes
MYTH BUSTER
MYTH: “If I hit my protein number, my muscle is protected.”
Not necessarily.
Muscle preservation is a combination of protein + resistance exercise + adequate energy + overall health.
TAKEAWAY
Protein gives your body the building blocks. Resistance exercise gives your body a reason to keep the muscle.
8. THE SIDE EFFECTS ARE REAL, BUT NUTRITION CAN HELP
The most common side effects of semaglutide and tirzepatide are gastrointestinal and can include nausea, constipation, diarrhea, vomiting, reflux, abdominal discomfort and early fullness.
These symptoms are particularly common during dose escalation.
This is exactly why I don't think nutrition support should begin only after someone develops a problem.
Meal size, eating speed, hydration, fibre intake, fat content and meal timing can all influence how someone feels.
IF NAUSEA OR EARLY FULLNESS IS AN ISSUE
Think:
Smaller meals
Slower eating
Stop at comfortable fullness
Prioritize protein
Maintain adequate hydration
Discuss persistent symptoms with your healthcare provider
IF CONSTIPATION IS AN ISSUE
Think:
Adequate fluid
Gradually increasing fibre
Regular movement
Vegetables and fruit
Beans and legumes
Whole grains where appropriate
Psyllium or other strategies when individually appropriate
Persistent vomiting, severe abdominal pain, inability to maintain hydration or other concerning symptoms need medical assessment, not another TikTok remedy.
TAKEAWAY
Side effects aren't something you simply have to “push through.” They should be actively managed.
9. MORE MEDICATION AND MORE RESTRICTION ARE NOT AUTOMATICALLY BETTER
There are two versions of “more is better” that concern me. The first is medication. The second is dietary restriction.
“I NEED TO GET TO THE MAXIMUM DOSE.”
Not necessarily.
Individual response varies. Some people respond strongly earlier in treatment, while others require higher therapeutic doses.
Dose decisions should be made with the prescriber based on:
The reason the medication is being used
Clinical response
Side effects and tolerability
Medical history
Overall health goals
“IF GLP-1 IS WORKING, I'LL ADD INTERMITTENT FASTING AND LOSE EVEN MORE.”
Also not necessarily.
Intermittent fasting itself isn't inherently unhealthy. But if your appetite is already significantly suppressed, adding aggressive fasting can make it much harder to consume enough protein, energy, fibre, calcium, iron and fluid.
It also gives you fewer opportunities to distribute protein throughout the day.
If someone is already struggling to eat enough, I am much more interested in:
Nutrient adequacy
Protein distribution
Resistance training
Hydration
Food quality
TAKEAWAY
You don't get extra metabolic points for eating as little as possible or taking the highest possible dose. The goal is an effective, medically appropriate treatment plan that you tolerate well and can pair with adequate nutrition.
10. WHAT HAPPENS IF YOU STOP?
This is one of the most important conversations to have before starting.
In the STEP 1 extension, people who stopped semaglutide regained approximately two-thirds of their previous weight loss within one year, and many cardiometabolic improvements moved back toward baseline.
That tells us something important.
For many people, these medications are treating ongoing biology, not permanently “resetting” metabolism.
WHAT ABOUT A LOW-DOSE “TUNE-UP”?
I hear versions of this question all the time:
“I don't need to lose 50 pounds. Could I take a low dose, lose 10 or 15 pounds, reset myself and then stop?”
It's a fascinating question, and I understand why people ask it.
But we need to separate what people are experimenting with in clinical practice from what has actually been proven.
For Wegovy, 0.25 mg is the starting dose, not the standard therapeutic maintenance dose.
We currently do not have strong randomized evidence showing that taking 0.25 mg semaglutide temporarily creates a metabolic “reset” followed by reliable long-term weight maintenance after stopping.
Could future research identify people who respond exceptionally well to lower doses, maintain successfully at lower doses or discontinue without substantial regain?
Possibly.
But we aren't there yet.
MYTH BUSTER
MYTH: “I'll use it for three months, reset my metabolism and then I'll be cured.”
Current withdrawal data don't support that promise.
TAKEAWAY
The lowest effective dose may be an appropriate conversation with your prescriber. A proven short-term metabolic reset is not something we can currently promise.
THE DIETITIAN'S GLP-1 CHECKLIST
When I'm working with someone taking a GLP-1, I don't just want to know what the scale says. I want to know whether we're protecting the rest of their health.
Depending on the individual, I may look at:
Weight trajectory and waist circumference
Body composition and strength
Protein and overall energy intake
Fibre and dietary quality
Hydration and bowel function
Blood pressure
HbA1c and glucose
Lipids
Kidney and liver health
Vitamin D
Vitamin B12
Ferritin and iron status
Calcium intake
Exercise and resistance training
Existing medication requirements
Because losing 30 pounds while becoming weaker, constipated and nutritionally depleted is not my definition of optimal treatment.
WHAT ABOUT SUPPLEMENTS?
Supplements can be useful, but I don't want them replacing food.
I prefer to identify actual gaps based on dietary intake, laboratory results, medications, medical history and individual risk.
Depending on the person, I may pay particular attention to:
Vitamin D
Vitamin B12
Iron and ferritin
Folate
Calcium
Omega-3 fats
Fibre
A multivitamin-mineral supplement may be reasonable for selected people whose food intake has become very limited.
B12 deserves particular attention in people following vegan diets or with other risk factors for deficiency. Iron should generally be individualized to dietary intake, ferritin, hemoglobin and clinical need rather than automatically supplemented.
For calcium, I prefer a food-first approach where possible, using foods such as dairy or fortified alternatives, calcium-set tofu, leafy greens and canned fish with bones.
And for constipation or low fibre intake, psyllium can be useful for selected individuals when introduced gradually with adequate fluid.
Supplements can complement the diet. They cannot replace one.
5 GLP-1 MEDIA MYTHS I WOULD LOVE TO RETIRE
“GLP-1s are the easy way out.”
Obesity and metabolic disease are biologically complex. Using evidence-based pharmacotherapy when medically appropriate is not a moral failure.
“Everyone loses 20% of their weight.”
No. Clinical-trial averages vary by medication, dose and population, and individual responses vary considerably.
“GLP-1s melt your muscle.”
Substantial weight loss generally includes some lean mass loss. The priority is protecting muscle through adequate nutrition and resistance exercise.
“You should eat as little as possible while you're on one.”
No. Excessive restriction can increase concern about inadequate nutrition, muscle loss and poor dietary quality.
“Take it for a few months and your metabolism will reset.”
We don't currently have evidence supporting that promise. Weight regain after discontinuation is common.
MY BOTTOM LINE
I am excited about GLP-1 medications. Not because I think everyone needs one.
Not because I think thinness equals health. And certainly not because I think nutrition suddenly doesn't matter. I'm excited because, for some people, these medications have changed a conversation that historically sounded like:
“Try harder. Eat less. Exercise more.”
We now understand much more about the biology of appetite, insulin resistance, visceral adiposity, menopause, PMOS, metabolic adaptation and cardiometabolic disease.
For appropriately selected people, GLP-1-based medications can reduce hunger and food noise, produce substantial weight loss and, in certain populations, improve important metabolic and clinical outcomes.
But they don't automatically teach you:
How much protein you need
How to preserve muscle and bone
How to meet your micronutrient needs
How to manage constipation or nausea
How to fuel exercise
How to eat for cardiovascular health
How to build a sustainable long-term nutrition plan
Or what your maintenance strategy should look like
That is why I believe nutrition care belongs alongside the prescription, not as an afterthought.
And maybe that is the biggest message I want you to take away from this entire conversation.
I don't want you spending the next decade jumping from diet to diet, losing and regaining the same weight, blaming yourself every time your body doesn't respond the way you expected.
I want you to understand your body better.
I want us to look deeper when something isn't working.
I want to protect your muscle, bone and metabolic health while we're working toward your goals.
And if medication is an appropriate tool for you, I want it incorporated into a nutrition and lifestyle strategy that is realistic enough to follow wherever life takes you.
The prescription is the beginning of the conversation, not the end.
Because the ultimate goal isn't:
“How little can I eat?”
It's:
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