GLP-1 weight loss medication can change how hungry you feel, how quickly you feel full and whether you feel cravings for high-calorie foods..
That makes what you eat particularly important. The goal isn’t to eat as little as possible, but to make sure the food you do eat gives your body the protein, fibre, vitamins, minerals and energy it needs.
You don’t need a special “GLP-1 diet”. Instead, focus on balanced, nutritious foods that you tolerate well and can continue eating as part of a sustainable approach to weight management.
What Foods Should You Eat While Taking GLP-1 Medication?
There’s no single meal plan that’s right for everyone, but when your appetite is reduced, making nutritious choices can help you get more from the food you’re able to eat.
Aim for a varied diet that provides protein, fibre, healthy fats, vitamins and minerals rather than simply focusing on eating less.
Protein-Rich Foods
Protein is particularly important while losing weight because it helps support your muscles and other tissues.
Good sources can include:
- Eggs
- Fish
- Chicken and other lean meats
- Low-fat Greek yoghurt and cottage cheese
- Beans, lentils and other legumes
- Tofu and other soy-based foods
- Nuts and seeds
Because your appetite may be smaller, try to include a source of protein regularly throughout the day.
When choosing dairy products such as Greek yoghurt and cottage cheese, check the nutrition label and consider lower-fat options to help limit your intake of saturated fat while still benefiting from their protein and other nutrients.
If you eat a mostly or entirely plant-based diet, combining a variety of plant proteins across your diet can help provide all the essential amino acids your body needs. Legumes such as beans, lentils and chickpeas complement grains such as brown rice, wholewheat bread, oats and other whole grains particularly well.
Vegetables and Fruit
Fruit and vegetables provide fibre along with a wide range of vitamins, minerals and other beneficial plant compounds.
Aim for variety – different types and colours of fruit and vegetables provide different nutrients, so there’s no single “best” fruit or vegetable for weight loss.
Whole fruit can also provide fibre alongside its naturally occurring sugars, making it a useful option when you want something sweet.
If your appetite is reduced, avoid filling up on very large portions of low-energy vegetables at the expense of protein and other nutrient-rich foods. Balance is particularly important when you’re eating smaller amounts overall.
If you’re experiencing digestive symptoms, you may also find some fruits and vegetables easier to tolerate than others.
High-Fibre Carbohydrates
Carbohydrates don’t need to be eliminated when you’re trying to lose weight.
Whole grains, oats, brown rice, wholewheat breads, beans and lentils provide carbohydrates alongside useful nutrients and fibre.
Fibre supports digestive health and can be particularly helpful if you’re experiencing constipation. Fibre-rich carbohydrates can also complement plant sources of protein, helping you build more nutritionally balanced meals.
However, suddenly increasing your fibre intake can sometimes cause bloating or digestive discomfort. Increase it gradually and make sure you’re also drinking enough fluids.
Healthy Fats
Fat is an important part of a balanced diet, but the type and amount of fat matter.
Some nutrients are fat-soluble, meaning your body needs dietary fat to absorb and use them effectively. This includes vitamins A, D, E and K, as well as certain beneficial compounds found in plant foods.
Foods such as avocado, nuts, seeds, olive oil and oily fish provide predominantly unsaturated fats and other useful nutrients, including omega-3 fatty acids from oily fish. Including a small amount of these foods with your meals can help your body absorb fat-soluble nutrients while contributing to a balanced diet.
Where possible, favour unsaturated fats over foods high in saturated fat. That doesn’t mean saturated fat needs to disappear completely from your diet – the overall balance of your eating pattern matters.
Fat is also energy-dense, so smaller portions can provide significant energy and nutrition when your appetite is reduced. However, very rich or fatty meals can worsen nausea, indigestion or other digestive symptoms for some people taking GLP-1 medication, so pay attention to what you tolerate comfortably.
Should You Prioritise Protein While Taking a GLP-1?
Protein deserves some extra attention when you’re losing weight.
When your body weight decreases, some lean mass can be lost alongside body fat. Eating adequate protein, together with appropriate resistance exercise, can help support muscle maintenance during weight loss.
Your individual protein requirements depend on factors including your starting BMI and activity levels. Rather than following a generic protein target from social media or the internet, speak to your doctor if you’re unsure how much you need.
Be mindful of how you’re getting your protein too. Some popular “high-protein” recipes and diet trends can also be high in saturated fat, particularly when they rely heavily on ingredients such as high-fat dairy products, processed meats or large amounts of cheese. A food or recipe being high in protein doesn’t automatically make it a balanced choice.
Look at the overall nutritional value of your meals and vary your protein sources. If you need help working out how much protein you need or how to build a balanced diet around your treatment, a registered dietitian can provide advice based on your individual needs.
Learn more about GLP-1s and Muscle Loss
What if You Don’t Feel Hungry?
A reduced appetite is part of how GLP-1 treatment can support weight loss, but regularly eating too little can make it difficult to meet your nutritional needs.
If you’re struggling with larger meals, smaller meals may be easier to manage.
When your appetite is low, prioritise nutrient-dense foods so you’re getting more from the smaller amount you’re comfortably able to eat. For example, eggs, Greek yoghurt, oily fish, legumes, avocado, nuts and seeds can provide protein, healthy fats, vitamins and minerals without requiring very large portions.
If you’re consistently struggling to eat enough, speak to your doctor.. They can help you find ways to meet your nutritional needs while your appetite is reduced. Persistent difficulty eating shouldn’t simply be viewed as a sign that the medication is “working better”. If you need additional nutritional support, your Meridian doctor can refer you to our registered dietitian.
What Foods Should You Avoid While Taking GLP-1 Medication?
There isn’t a universal list of foods that everyone taking a GLP-1 must avoid.
However, some foods may be harder to tolerate, particularly if you’re experiencing nausea, indigestion or other digestive side effects.
You may find it helpful to limit:
- Very large meals
- Rich or very fatty foods
- Highly processed foods with little nutritional value
- Foods that consistently make your symptoms worse
- Excessive alcohol
Rather than imposing unnecessary food rules, pay attention to how your body responds and choose foods that help you maintain a balanced diet comfortably. You don’t necessarily need to completely cut out the foods you enjoy – building a balanced way of eating that includes them in moderation can be easier to maintain over the long term.
What Should You Eat if GLP-1 Side Effects Are Making You Feel Sick?
Nausea, constipation, diarrhoea and other digestive symptoms can occur with GLP-1 treatment.
If you’re feeling nauseous, smaller meals may be easier to tolerate than large portions. Rich, fatty or spicy foods can also make symptoms worse for some people.
For constipation, adequate fluids and gradually increasing fibre-rich foods may help.
The right approach depends on the symptoms you’re experiencing. If side effects are persistent, severe or making it difficult to eat or drink normally, speak to your doctor rather than trying to manage them through diet alone.
Learn more about the Side Effects of GLP-1s
Don’t Forget About Hydration
Eating less can sometimes mean drinking less too, particularly if you previously consumed a lot of fluid alongside meals.
Make a conscious effort to stay hydrated throughout the day.
This can be particularly important if you’re experiencing vomiting or diarrhoea, exercising regularly or spending time in hot weather.
Your fluid needs can vary according to your health, activity and other factors, so speak to your healthcare professional if you’ve been advised to restrict your fluid intake or you’re unsure what’s appropriate for you.
Do You Need Supplements While Taking GLP-1 Medication?
Taking a GLP-1 doesn’t automatically mean you need vitamin or mineral supplements. However, factors such as a current or previous iron deficiency, a vegetarian or vegan diet, or previous gastric surgery may necessitate supplementation. In general, a healthy and balanced diet is sufficient to get all your macro- and micro-nutrients.
Build Eating Habits You Can Maintain
GLP-1 treatment can make it easier to manage hunger and food intake, but your eating habits still matter.
Rather than treating your time on medication as a temporary period of extreme restriction, use it as an opportunity to build an eating pattern that supports your health and feels realistic for the longer term.
This becomes particularly important if your treatment changes or eventually stops, when your appetite may increase again. You may also notice changes in cravings or how often you think about food – sometimes referred to as “food noise”.
Learn more about Stopping GLP-1 Weight Loss Injections
GLP-1 Weight Loss Treatment With Meridian Health
At Meridian Health, treatment starts with a medical assessment and online doctor consultation. Ongoing care gives you an opportunity to discuss your progress, response to treatment and any concerns you have while using your medication.
Medically reviewed by Dr Joshua Czech, October 2026