Medically Reviewed
Key Takeaways
- GLP-1 medications can reduce appetite enough to make it harder to meet protein needs, especially on a vegetarian or vegan diet.
- GLP-1 users can aim for about 0.5 to 0.7 grams of protein per pound of ideal body weight (1.2 to 1.5 grams per kilogram) daily.
- Protein-dense foods such as tempeh, seitan, and hemp hearts can provide more protein in smaller portions.
- Smaller, more frequent meals and snacks can make it easier to meet nutrition needs when appetite is low.
- A registered dietitian can help if you are struggling to get enough protein or other key nutrients.
Following a plant-based diet while taking a GLP-1 medication like semaglutide or tirzepatide comes with a few challenges, including a low appetite, inadequate overall energy intake, and difficulty meeting protein needs.
The good news: it's perfectly possible to meet your nutrient needs while following a vegetarian, pescatarian, or vegan diet and taking a GLP-1 medication. It just takes a bit more planning to make sure you're meeting your protein, energy, and overall nutrient needs.
Plant-based eating is on the rise as nutrition scientists continue to learn more about its health benefits, making now a good time to get familiar with how to make it work alongside your GLP-1 treatment.
What Counts as "Plant-Based"?
- Vegetarian: May include eggs or dairy products but excludes animal-based foods such as meat, poultry, fish, or pork.
- Pescatarian: Excludes meat and poultry but includes fish.
- Vegan: Excludes all animal-based foods and centers exclusively on plant-based foods.
Why Protein Takes More Planning When Appetite Drops
Protein is a key nutrient for GLP-1 users. Alongside resistance training, adequate protein will help to preserve lean body mass, maintain bone strength, and support your immune system. But getting enough protein can be tricky when you’re eating less food overall and following a plant-based eating pattern.
In a cross-sectional study of GLP-1 users, participants underconsumed protein, along with other key nutrients such as fiber, calcium, iron, magnesium, and potassium.
With solid planning, GLP-1 users can meet their protein needs on a plant-based diet. Aim for a protein target of 1.2 to 1.5 grams of protein per kilogram (kg) of ideal body weight daily. Then plan meals and snacks to ensure you meet your protein target each day.
Because plant-based protein sources typically have less protein per ounce compared to animal-based protein sources, it is important to make a conscious effort to include a protein source at each meal and snack.
Choosing small meals throughout the day can help to ensure you stay nourished and meet your protein needs, especially when your appetite is low. If you used to eat three larger meals per day, try aiming for three smaller meals and three snacks. For example:
- 7:00 AM: Small breakfast
- 9:30 AM: Snack
- 12:00 PM: Small lunch
- 2:30 PM: Snack
- 5:00 PM: Small dinner
- 7:30 PM: Small snack
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Plant-Based Food Options When Appetite Is Low
For those with a very low appetite, relying on plant-based foods to meet your protein needs can be a unique challenge. Though plant-based foods (e.g., lentils, beans) are rich in protein, they are also high in fiber.
Fiber has numerous health benefits, including making you feel fuller longer. For those with a very low appetite, this effect may actually be counterproductive to getting enough nutrition.
For those following a vegan diet, try choosing foods that give you the most protein “bang for your buck,” such as tempeh (18 grams of protein per 3 oz), seitan (18 grams of protein per 2 oz), or hemp hearts (10 grams of protein per 3 Tablespoons).
These are complete proteins, meaning they include all nine of the essential amino acids, or the building blocks of protein. Other plants are considered incomplete protein sources, meaning they do not provide all of the essential amino acids in a single food. However, a mix of various sources throughout the day can ensure your bases are covered.
Below are good plant-based protein sources:
Soy Foods
Beans/Legumes
Whole Grains
Nuts/Seeds
Vegetables
Those following a vegetarian plant-based diet may include eggs or dairy products to meet their protein needs. Eggs and dairy also provide a complete protein source.
The table below shows the protein content of eggs and dairy foods:
Eggs
Dairy
Small Meal Ideas for Plant-Based GLP-1 Users
As you adjust to your medication and eating habits, you may feel ready to try some new meal ideas.
The following suggestions provide plant-based protein, fiber, and a range of vitamins and minerals:
- Tofu scramble with vegetables
- Tempeh strips with rice or greens
- Lentil soup with whole-grain crackers
- Bean and avocado toast
- Hummus with pita and vegetables
- Greek yogurt or high-protein dairy alternative with berries
- Soy milk smoothie with fruit
- Chia pudding with soy milk or pea protein milk
- Peanut butter or tahini on toast
Plant-Based Protein Powders and Shakes
For those struggling to meet their protein needs through whole foods, a protein powder or shake can be a helpful tool in the toolbox. If you include animal-based foods in your diet, whey, egg, or casein-based protein powders are well absorbed.
For those following a vegan diet, plant-based options are also available on the market, including soy, pea, or hemp-based powders.
Protein content varies by brand. In general, the protein content of protein powders per ounce (or about 30 grams) is:
- Pea protein, 23 grams
- Hemp protein, 15 grams
- Soy protein, 24 grams
- Whey protein isolate, 25 grams
- Whey protein concentrate, 20 grams
- Egg white protein, 24 grams
In addition, the amino acid content of the protein source may vary. Whey, pea, soy, hempseed, and egg white provide all nine essential amino acids. But it’s important to note that protein powders should not be your sole protein source, so limiting your options to complete proteins isn’t necessary.
If you are shopping for a protein powder, keep an eye out for other ingredients beyond just the protein content. Some brands will include added sugars or artificial sweeteners; aim to find a brand without these if you are trying to avoid additional additives.
Even if the powder has no flavor, you can blend it with other ingredients in a smoothie to add flavor and texture. Other brands may include healthy fatty acids or fiber in their formulation. Though you do not need to steer clear of these, you can simply note how they are contributing to your overall dietary intake.
Lastly, take care to identify a protein powder brand that has been third-party verified, such as the U.S. Pharmacopeia (USP) or National Safety Foundation (NSF). These stamps of approval confirm that the ingredients listed are what is actually contained in the product.
When to Work With a Dietitian
If you are unsure whether you are getting enough protein (or other key nutrients such as fiber, vitamins, and minerals), a Registered Dietitian Nutritionist (RDN) can help. RDNs are food and nutrition experts who can evaluate your diet and support you in meeting your health and nutrition goals. Other common questions RDNs can help with include:
- How do I maintain weight loss long-term?
- Do I need a dietary supplement?
- What should I eat if I have nausea, vomiting, constipation, or diarrhea with my GLP-1 medication?
Bottom Line
Meeting your protein needs on a plant-based diet while taking a GLP-1 is realistic with the right approach. Choosing protein-dense foods, planning smaller meals throughout the day, and using a protein powder when needed can all help close the gap when appetite is low.
There is no single right way to do this, so it may take some trial and error to find what works for your body and routine. If you have questions about your protein intake or overall diet, an RDN can help you build a plan that fits your needs.
Frequently Asked Questions
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By Whitney Linsenmeyer
Assistant Professor of Nutrition and Dietetics
Whitney Linsenmeyer, PhD, RD, is an Assistant Professor of Nutrition and Dietetics at Saint Louis University and a National Spokesperson for the Academy of Nutrition and Dietetics with expertise in fad diets, culinary nutrition, and transgender health. Her research focuses on gender-affirming nutrition care, and she brings a joy-first approach to food science and eating behavior.
