Unless you’ve been living under a rock, you’ve probably heard of the so-called “miracle” weight loss jabs – GLP-1 receptor agonists like semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro). Once used primarily for type 2 diabetes, they’re now being prescribed for obesity – and yes, they do work. But here’s the truth: they’re not a magic wand, and if we want long-term results and better health, we’ve got to look at the bigger picture.

So, let’s have a proper look at what these jabs do, why muscle matters, and how lifestyle still rules the roost.

🚀 What Are GLP-1s and Why Is Everyone Talking About Them?

GLP-1 drugs mimic a natural gut hormone that helps regulate appetite. They reduce “food noise” – that relentless chatter in your head telling you to grab another biscuit (as Dr Michael Mosley described so well in Food Noise, 2025). And yes, they can be remarkably effective: trials show people can lose 15–20% of their body weight with regular use (Wilding et al., 2021; SURMOUNT-1 trial, 2023).

In fact, recent UK guidance from NICE (2025) now recommends these medications for certain patients living with obesity. And while NHS access is still limited, private prescriptions and awareness are booming – a recent Ipsos poll (2024) found that awareness of these treatments is higher than ever, even though most Britons still prefer exercise and diet first.

Across the pond, about 12% of US adults have already tried them (Harris, 2024), and we’re seeing similar interest here. But with all this buzz, it’s easy to forget that these drugs come with caveats – and they’re not a free pass to ditch healthy habits.

🏋️‍♂️ Strength Training: The Unsung Hero

Here’s the kicker: while GLP-1s help shift the weight, they don’t distinguish between fat and muscle. Studies like the STEP 1 and STEP 4 trials (Rubino et al., 2022; Lundgren et al., 2021) found that up to 40% of that weight loss may come from lean body mass – which definitely isn’t what we want. Losing muscle can slow your metabolism and make weight regain more likely (as well as a whole load of other nasties).

This is where strength training comes in. Resistance exercise not only helps preserve muscle, but also improves insulin sensitivity, bone density, and mood. It’s particularly vital for women post-menopause, who are already at higher risk of sarcopenia – the age-related, degenerative loss of skeletal muscle mass, quality, and strength, often leading to weakness, fatigue, falls, and physical disability (Hurtado et al., 2024).

So, if you’re using a GLP-1, a few strength sessions a week can make a world of difference. Not keen on the gym? Bodyweight exercises, yoga, or carrying your shopping home count too!

🥦 Why Lifestyle Still Matters

It’s tempting to think of GLP-1s as a replacement for lifestyle changes. But here’s the truth – and the science backs it up – medication works best when combined with changes in diet, movement, sleep, and stress management.

The British Dietetic Association (2024) and NICE both stress the importance of ongoing lifestyle support alongside medication. Without it, people often regain weight once they stop the injections (Rubino et al., 2022). And let’s not forget – obesity isn’t just about the number on the scale. It’s also about nutrition quality, mental health, and preventing chronic conditions like heart disease and type 2 diabetes (Beanfield et al., 2024).

Worryingly, the UK’s diet quality remains poor, with fewer than 1 in 3 adults meeting the 5-a-day fruit and veg target (DHSC, 2024). Ultra-processed foods tend to dominate our plates, and physical activity can be patchy at best.

In short: these medications can help, but if we don’t build better habits at the same time, we’re setting ourselves up for a return ticket.

💰 And What About the Bigger Picture?

From a public health perspective, GLP-1s could help reduce the £98 billion annual cost of obesity to the UK (Tony Blair Institute, 2023). But this kind of intervention alone won’t fix the root causes – lifestyle factors, food marketing, urban design, attitudes to strength training and access to healthy food all play a role. As the recent JAMA editorial (Davis & Lorig, 2024) put it: medication is a tool, not a solution.

🧠 Final Thoughts – So, what’s the takeaway?

GLP-1s are a game-changer for many – but not a get-out-of-jail-free card. Muscle matters. Lifestyle is still king. And whether you’re on the jabs or not, focusing on strength training, eating whole foods, and moving regularly is the foundation for lasting health.

If you’re considering these meds or are already using them, have a chat with your GP or a registered dietitian. And remember: your health is more than just your weight (something I keep banging on about!). Please consider strength training to help you be as healthy as possible, no matter what age you are, what size you are, or whether you are taking the weight loss jabs or not. Your body will certainly thank you for it!