Weight Loss Injections: What They Do (and What They Don't)

Weight loss injections are everywhere right now. From celebrities to everyday people, medications like Ozempic, Wegovy and Mounjaro have completely taken over the field of fat loss. They're often described as a breakthrough, and in many ways they are, but they're also widely misunderstood. More importantly, they're often taken out of the bigger context of how the body actually works - fat loss doesn't happen in isolation. It happens within a system - one that is constantly trying to maintain balance. What Are GLP-1 Medications, Really? GLP-1 medications mimic a naturally occurring hormone made in the small intestine, called Glucagon-like peptide-1 (GLP-1). This hormone is released after eating and plays a central role in:

• Blood sugar regulation by triggering insulin release

• Blocking glucagon secretion, thereby preventing glucose from entering the blood stream

• Appetite signaling (hunger and satiety) by affecting areas of the brain

• Digestion by slowing stomach emptying These medications were originally developed to treat type 2 diabetes, where controlling blood sugar is critical.

What researchers noticed, however, is that these patients weren't just improving their blood sugar - they were also losing weight. And not just a little.

Why the Results Feel So Dramatic

For many people, using GLP-1 medication feels like a complete shift in their relationship with food. Suddenly, hunger is quieter, cravings feel less intense and portion sizes naturally shrink. For someone who has spent years feeling constantly hungry or battling cravings, this can feel life-changing.

And physiologically, it makes sense. These medications work directly on the systems that regulate hunger and fullness - systems that are often dysregulated in people who struggle with weight. So when those signals become stable, eating less no longer feels like a constant fight.

How Do They Work?

It's easy to assume that these drugs "cause" fat loss, but what they actually do is influence the drivers of eating behaviour.

1. Appetite suppression

   They act on the brain to reduce hunger signals, meaning you feel satisfied with less food.

2. Slower digestion

   They cause food to stay in the stomach for longer, which prolongs feelings of fullness after meals.

3. Blood sugar stability

   By improving the insulin response and reducing spikes, they help avoid energy crashes that often drive over-eating.

Put together, this creates an environment where eating less feels natural, and over time, this leads to weight loss. This might sound like a dream, but what's the cost?

While the outcome is fat loss, the mechanism is reduced food intake. This is important.

Reducing food intake without intention doesn't just reduce body fat, it also reduces:

Muscle mass

Nutrient intake

Overall energy availability

And that's where things start to unravel.

If your afternoon snack attacks suddenly disappear on GLP-1 medications, it's easy to think that something has been "cured". But it's not that your habits have changed. You simply don't feel like eating.

The same goes for things like late-night eating. If you used to find yourself snacking at midnight and that suddenly disappears, it's not a GLP-1 breakthrough. Your appetite is low. You might be nauseas. So the desire to eat simply isn't there. But none of this is a healthy sign. Having a reduced appetite isn't a good thing.

It's easy to convince yourself that pushing through nausea or dealing with constipation is worth it if the scale is dropping. But those are alarm bells from your body saying that something isn't right.

Your body wasn't designed to run on as little as possible. It was designed to be fueled, supported and functioning optimally. We need adequate energy for exercise, brain function, hormone balance, immune support, recovery and daily performance. Consistently under-eating doesn't just reduce body weight, it compromises how your entire system functions.

The Side Effects (and What They're Telling You)

Because these medications directly affect digestion and appetite, side effects are common, especially initially, or when increasing the dosage.

Most common (short term):

• Nausea

• Vomiting

• Constipation

• Diarrhea

• Bloating

• Dizziness

• Tachycardia (increased heart rate)

• Headaches

• Loss of appetite (to the point of struggling to eat)

These are a direct result of slowed gastric emptying, altered hunger signals and changes in how your body processes food.

In some cases, side effects are mild and temporary. In others, they can significantly impact quality of life.

There are also less common (and longer term) but more serious side effects like:

• Gall bladder complications

• Pancreatitis

• Acute kidney injury

• Medullary thyroid cancer

• Worsening diabetes-related retinopathy (damage to retinal blood vessels)

• Severe gastrointestinal issues

• Loss of lean muscle mass (over 30% of weight loss can be from muscle)

• Potential effects on bone density

• Reduced physical performance due to low energy intake

The Part No One Talks Enough About

GLP-1 medications can change how much you eat, but they don't teach you:

• How to structure your meals

• What to eat

• How to fuel your body properly

• How to manage the side effects

They don't build healthy habits. And they don't protect your physiology during weight loss.

Muscle, Metabolism and Why "Just Eating Less" Isn't Enough

Your body doesn't just care about weight, it cares about survival, and optimal function.

When food intake drops significantly, your body adapts.

Without enough protein and resistance training, muscle mass can be lost alongside fat, metabolic rate decreases, and strength and physical resilience can decline. This matters far beyond aesthetics.

Your muscle is a key driver of your metabolic health. It is protective for long-term weight maintenance and essential for bone health and aging well. So while the scale may be going down on GLP medications, the quality of that weight loss matters.

What happens when the medication stops?

This is where many people struggle the most.

While the medication is active, hunger is suppressed and eating less feels easy.

Once the medication is removed, appetite returns, hunger signals increase and old habits resurface.

Without a strong foundation in place, weight regain becomes very likely because underlying behaviours were never addressed. Who Might Benefit From Their Use?

The FDA approved the use of GLP-1 medications to help manage type 2 diabetes. This is because they help to lower blood sugar levels.

The FDA does currently approve the use of certain GLP-1s for treating obesity (individuals with a BMI of more than 30). Healthcare providers may also prescribe them for people who are overweight (BMI of 25 - 29.9) with coexisting conditions like diabetes, high blood pressure or sleep apnea.

Where the conversation becomes more complex is in how widely these medications are now being used outside of clear medical need. This means GLP-1 medications are not intended for people who just want to drop a few kilos. For individuals carrying a relatively modest amount of excess weight, without underlying metabolic or health complications, the first line of approach should always be sustainable nutrition, consistent movement and behaviour change, because these are the things that support long-term health, not just short-term weight loss.

If You Choose to Use GLP-1 Medications...

The conversation needs to shift. ...Away from judgement. Away from extremes. And towards education and support. While I don't support the use of GLP-1 medications, I do support the user. If someone is using these medications, the goal should not just be weight loss, it should be using the medication in a way that protects their physiology and sets them up long term.

That looks like:

1. Learning how to eat (even with low appetite) Prioritising protein Including nutrient-dense foods Creating structure even when hunger is low

2. Managing side effects intentionally Constipation - fiber, fluids, movement

   Nausea - smaller, more frequent meals

   Low appetite - choosing foods that deliver more nutrition per bite

3. Protecting muscle and bone health

   Resistance training is non-negotiable

   Protein intake needs to be a priority

   Undereating needs to be avoided

4. Changing behaviour

   Planning for what comes after the medication is stopped

   Not skipping meals

   Adding veggie volume where possible

   Having intentional snacks

   Coping skills for emotional eating

My Perspective As A Nutrition Coach

An anti-anxiety medication can quiet the mind to allow the talk-therapy tools to be put into practice. In an otherwise noisy mind, these tools may be ineffective. But anti-anxiety meds without tools are just putting a band-aid on the issue.

In the same way, GLP-1 medications can be powerful. For some people, they can create a window of opportunity - a chance to feel what it's like to not be constantly driven by hunger. But they are not a replacement for learning how to live in your body. Our bodies are always working towards balance. Every system is constantly adjusting to keep you stable. And medication influences that system. But your daily habits - how you eat, how you move, how you respond to your body, are what determine how well that system functions over time.

You wouldn't deprive a high-performance car of oil just to save money. You protect it, maintain it and fuel it properly because that's what allows it to perform at it's best.

Your body is no different. There is nothing wrong with using tools, but tools don't do the work for you.

If you are otherwise healthy and your goal is to lose 10 - 20 kg, the most valuable investment you can make is learning how to eat in a way that supports your body, build habits you can sustain and work with your physiology. You can suppress your appetite. You can alter your physiology from the outside.

But long term health still comes back to the same pillars: Nourishing your body Supporting your muscle and metabolism Building habits you can live with Nurturing your mental health I know it can feel hard - showing up every day, planning meals, making intentional choices, doing the work consistently - only to see progress that feels really slow. Especially when it seems like everyone around you is taking a shortcut and watching the scale drop quickly. It's understandable to question whether you're doing this the 'right' way.

But you don’t see their side effects. You don’t feel their nausea, their fatigue, their discomfort. And they don’t see your discipline. Your effort. Your consistency. Your sacrifices.

This isn’t about dismissing GLP-1 medications - they have a place, and for the right person, they can be incredibly helpful. But there’s also something incredibly valuable about doing this through lifestyle changes. Because while it may feel like the harder and longer path, it’s actually the one that teaches you the most.

So if you’re in that space right now, putting in the work and wishing it was faster…

Don’t lose perspective.

Slow, sustainable progress isn’t a sign that something isn’t working. It’s often a sign that you’re doing it right. And the reward at the end of that process is not just weight loss.

It’s confidence, consistency, and a way of living that actually lasts.

It's about learning to nourish yourself well - for life. GLP-1s are the tool. But you are the magic. And for those who want to do this journey the right way, I'm here to help.