If you’re taking a GLP‑1 medication, eating less can feel like a relief – but it can also raise new questions about nutrition.
GLP‑1 medications are changing the conversation around weight management by significantly reducing appetite and portion sizes. But importantly, they don’t change your body’s nutritional needs. When you’re eating less food overall, what you eat matters more than ever.
That’s why we asked our in‑house nutritionist to break down the key nutritional considerations for people using GLP‑1 medications – including protein intake, micronutrients, and where supplements may help support your health along the way.
What Are GLP‑1 Medications and How Do They Affect Nutrition?
GLP‑1 (glucagon‑like peptide‑1) is a hormone your body naturally releases after eating. It helps regulate appetite, digestion, and blood sugar.
GLP‑1 medications work by mimicking and extending this hormone’s effects, including:
- Slowing how quickly your stomach empties
- Signalling fullness to the brain
- Supporting insulin release and blood sugar stability
For many people, this leads to:
- Reduced appetite
- Smaller portion sizes
- Less frequent eating
- Reduced ‘food noise’
From a nutritional perspective, these changes can make it harder to meet daily protein, vitamin, and mineral requirements, even when weight loss is intentional.
Your Nutritional Needs Don’t Decrease Just Because You’re Eating Less
Your body’s requirements for protein, vitamins, and minerals are based on factors like body weight, muscle mass, activity level, and physiological function – not how small your meals are.
Why protein matters on GLP‑1
Why protein matters on GLP‑1
Protein plays a critical role in:
- Maintaining muscle mass
- Tissue building and repair
- Maintaining bones
When appetite is reduced, some people may find it more challenging to meet their protein needs.
What about vitamins and minerals?
A smaller, less varied diet can also lead to micronutrient gaps over time. Essential nutrients like B vitamins, iron, magnesium, zinc, and vitamin D are typically obtained through food variety – something that can be limited when appetite is suppressed.
This doesn’t mean supplements replace meals. But they can play a supportive role in helping to fill the nutritional gaps when intake is reduced.
Muscle loss and GLP‑1
Muscle loss and GLP‑1
Rapid weight loss can result in loss of both fat and lean muscle mass. Research suggests that when protein intake is inadequate, 25–40% of weight lost may come from muscle, not fat alone (2,3).
Preserving muscle is essential for:
- Long‑term metabolic health
- Bone strength
- Physical function
- Sustainable weight management
Emerging evidence suggests that higher protein intake combined with resistance training may reduce lean muscle loss while using GLP-1 medications (4).
How Much Protein Do You Need on GLP‑1?
General protein recommendations for adults typically range from 1.2–1.6 grams per kilogram of body weight per day.
For a 75kg adult, that’s approximately 90–120g of protein daily – and research suggests the higher end of this range may be more important during weight loss (1).
Protein shakes and powders
Protein shakes and powders
Liquid protein options may be a convenient choice when appetite is reduced because they’re:
- Easier to consume than large meals
- Quick to prepare
- Less filling than solid foods
Look for a blend of protein sources, which provides a broad amino acid profile from multiple protein sources.
A combination such as pea, soy, and milk proteins delivers both fast‑ and slow‑digesting amino acids for more sustained nourishment.
Added vitamins and minerals
Choosing a protein supplement that also includes essential vitamins and minerals can simplify your routine and reduce the need for multiple separate supplements — making nutrition easier to maintain long‑term.
The Takeaway: Supporting Your Body While on GLP‑1
GLP‑1 medications can be a powerful tool for weight management – but they work best when paired with intentional nutrition.
Eating less doesn’t mean your body needs less. It means what you eat matters more.
To support your health on GLP‑1:
- Prioritise protein at each meal
- Choose high‑quality protein sources to support muscle maintenance
- Include resistance or strength training
- Use supplements thoughtfully to support nutrient intake
With the right approach, it’s possible to support strength, nourishment, and long‑term wellbeing, even when your appetite is reduced.
Healtheries Protein Plus: A convenient option when appetite is reduced
Healtheries Protein Plus: A convenient option when appetite is reduced
Healtheries Protein Plus is formulated with a multi‑source protein blend, including:
- Whey protein concentrate
- Whey protein isolate
- Pea protein isolate
- Soy protein isolate
- Milk protein concentrate
- Skim milk powder
Our multi-source protein blend provides a complete amino acid profile to support the maintenance of muscle mass as part of an active lifestyle:
It’s:
- Low in sugar and carbohydrates
- Free from artificial flavours, colours, sweeteners, and preservatives
- Easy to use as a snack, in smoothies, or as a breakfast option when appetite is low
Plus, choosing a protein supplement that also includes essential vitamins and minerals can simplify your routine and reduce the need for multiple separate supplements — making nutrition easier to maintain long‑term. Each serve includes 16 essential vitamins and minerals, helping support overall nutrient intake when food volume is reduced.
References
- Stokes, T., Hector, A. J., Morton, R. W., McGlory, C., & Phillips, S. M. (2018). Recent perspectives regarding the role of dietary protein for the promotion of muscle hypertrophy with resistance exercise training. Nutrients, 10(2), 180. https://doi.org/10.3390/nu10020180
- Karakasis, P., Patoulias, D. I., Fragakis, N., & Mantzoros, C. S. (2025). Effect of glucagon-like peptide-1 receptor agonists and co-agonists on body composition: Systematic review and network meta-analysis. Metabolism: Clinical and Experimental, 164, 156113. https://doi.org/10.1016/j.metabol.2024.156113
- Cava, E., Yeat, N. C., & Mittendorfer, B. (2017). Preserving healthy muscle during weight loss. Advances in Nutrition, 8(3), 511–519. https://doi.org/10.3945/an.116.014506
- Tinsley, G. M., & Nadolsky, S. (2025). Preservation of lean soft tissue during weight loss induced by GLP-1 and GLP-1/GIP receptor agonists: A case series. SAGE Open Medical Case Reports, 13, 2050313X251388724. https://doi.org/10.1177/2050313X251388724