Nutrition Support on Wegovy or Mounjaro: What You Need to Know

GLP-1 medications like Wegovy (semaglutide) and Mounjaro (tirzepatide) are transforming weight management in the UK. But while these medications can be powerful tools, they work best when combined with the right nutritional support. As a registered dietitian specialising in metabolic health, I work with clients on GLP-1 medications to help them get the most out of their treatment — and protect their long-term health.

Why nutrition matters so much on GLP-1 medications

GLP-1 receptor agonists work by suppressing appetite, slowing gastric emptying, and improving insulin sensitivity. This means you'll eat significantly less, which sounds ideal for weight loss, but comes with a real nutritional challenge: when you're eating much less, every mouthful has to count.

Without proper guidance, many people on these medications fall into patterns of eating very little, choosing easy but nutritionally poor foods, and - most importantly - losing significant amounts of muscle mass alongside fat. Research shows that up to 40% of weight lost on GLP-1 medications can come from muscle, not fat. This has serious implications for your metabolism, strength, and long-term weight management.

What a dietitian can do for you on Wegovy or Mounjaro

Working with an HCPC Registered Dietitian while on a GLP-1 medication means you get a personalised plan designed around your reduced appetite, your health goals, and your lifestyle. Here's what we focus on together.

Protecting muscle mass

We prioritise adequate protein intake, typically 1.2–1.6g per kg of body weight spread across your meals to support muscle retention while you lose fat. This is one of the most important things you can do on these medications and it requires practical, realistic planning around a reduced appetite.

Preventing nutritional deficiencies

Eating significantly less means a real risk of missing out on key nutrients - iron, B12, calcium, vitamin D, zinc and omega-3s among others. A personalised plan ensures you're meeting your targets even on smaller portions, and we'll discuss targeted supplementation where needed.

Managing nausea and GI symptoms

Many people experience nausea, reflux, or constipation, especially in the early weeks. Dietary adjustments - smaller meals, specific food textures, timing of eating - can make a significant difference to your comfort and adherence to the medication.

Building habits that last

GLP-1 medications are a tool, not a permanent solution for everyone. The habits you build now around eating patterns, food choices, and your relationship with food are what will sustain your results if and when the medication is stopped or reduced. This is where dietitian support makes the biggest long-term difference.

Knowing the principles isn't enough

You might already know you need more protein, or that nausea makes eating hard. But knowing that and actually building a plan around it one that fits your appetite, your food preferences, your schedule, and any other health conditions, are very different things.

What dose are you on and how is your appetite affected? Do you have PCOS, T2 diabetes or high cholesterol alongside your weight goal? What happens when the nausea hits and you can barely eat anything? These are the questions a generic article can't answer — but a dietitian consultation can.

I work specifically with clients on Wegovy, Mounjaro and other GLP-1 medications to build a nutrition plan around their treatment — not a generic weight loss plan bolted on top of it. Most clients notice a real difference in their energy, their ability to hit protein targets, and their confidence around food within the first few weeks.

How to get started

I offer a free 15-minute discovery call so we can talk about where you are in your GLP-1 journey, what your goals are, and how I can help. There's no obligation — it's simply a chance to ask questions and make sure we're a good fit.

From there, you can choose a single initial consultation or the full 12-week Nourish Programme, which includes an in-depth assessment, three follow-up sessions, a personalised nutrition plan, and custom recipes — all built around your medication and your goals.

If you're on Wegovy or Mounjaro and want to make sure you're doing everything you can to get the best outcome, book your free call today.