Plant Protein on GLP-1 Medications: How to Reach Your Target Without Meat

Yes, you can reach your protein target on semaglutide (Ozempic, Wegovy) or tirzepatide (Zepbound, Mounjaro) without eating meat, but it takes more volume: a ¾-cup serving of cooked lentils or chickpeas (150 g) gives about 13 g, less than half the 29.0 g in 3.5 oz (100 g) of cooked chicken breast^[12]. What works best is spreading beans, soy, dairy or eggs (if you eat them) across several small meals, starting each meal with them, and raising fiber slowly so you don’t end up bloated.

Every food figure comes from USDA FoodData Central, through our food pages. Why muscle matters is in protein and muscle on GLP-1 medications; the overall plan is in what to eat on GLP-1 medications.

How much protein you need, whether or not you eat meat

The reference figures are the same for a vegetarian diet as for one that includes meat:

For someone who weighs 154 lb (70 kg), the weight-loss range works out to 84 to 112 g a day. The protein calculator runs your own numbers. Per meal, Leidy and colleagues suggest “potentially” 25 to 30 g^[3]; with plant protein and a small appetite, that’s the hardest part.

The 2025 advisory, written by four US obesity, nutrition and lifestyle-medicine societies, lists beans, peas, lentils and whole grains first among the protein sources to encourage, alongside dairy, seafood, eggs and lean poultry^[1]. And in its 2025 position paper on vegetarian diets, the Academy of Nutrition and Dietetics states that appropriately planned vegetarian and vegan diets can be nutritionally adequate for adults^[2]. The catch is in the planning: the Academy’s reasoning on protein assumes a varied diet that meets your energy needs^[2], and that’s exactly what changes on a GLP-1, because you eat a lot less.

Plant protein quality: PDCAAS, DIAAS and the combining myth

Protein quality depends on whether a food supplies the essential amino acids (the ones your body can’t make) and how well it’s digested. There are two ways to score it:

• PDCAAS (protein digestibility-corrected amino acid score). It compares the scarcest essential amino acid with a reference and corrects for digestibility^[6].
• DIAAS (digestible indispensable amino acid score). The 2013 FAO report recommends it as the replacement, because it measures the digestibility of each amino acid separately. The FAO itself acknowledges that digestibility data are still missing for many foods^[6].

The FAO report has an example that shows how this plays out. Wheat protein has 28 mg of lysine per gram and pea protein has 71; the adult reference is 48. With the sulfur amino acids it’s the other way around: 38 mg in wheat versus 25 in peas, against a reference of 23^[6]. A grain and a legume cover each other’s gaps.

Do they have to share a plate? No. The Academy’s 2025 paper explains that plant proteins contain all the essential amino acids, although they’re generally less digestible and can run low in lysine or methionine. It adds that this isn’t a concern for most people, because protein-rich plant foods vary so much that a varied diet eaten over the course of a day supplies enough of every essential amino acid, as long as it meets energy needs^[2].

In practice, lentils at lunch and whole-wheat bread at dinner count just as much as if you’d put them on the same plate.

The 20 plant foods with the most protein per serving

Ranked by protein in the typical serving from our database. Beans, grains and pasta are weighed cooked; cup measures are approximate.

Data: USDA FoodData Central^[12]. I leave out prepared dishes such as canned refried beans, because the traditional recipe can include lard. All the beans and lentils are on the beans and legumes page.

Two things stand out in the table:

• Beans are the base, but they take up room. Getting 25 g of protein from lentils alone would take about 280 g cooked (roughly 1⅓ cups). With a small appetite, half a serving at two meals works better than one big bowl.
• Tofu and soy milk are the most “compact.” They give 11.6 and 8.7 g of protein per 100 kcal, versus 7.8 g for lentils, with almost no fiber. The Academy calls soy a high-quality protein whose amino acid pattern closely matches human needs^[2]. The tofu in our database is USDA’s; your brand may have more or less, so check the Nutrition Facts label.

Edamame, tempeh, seitan, textured vegetable protein (TVP) and pea-protein products are easy to find in US grocery stores, but they aren’t in our database yet, so I don’t give figures for them: the Nutrition Facts label tells you the protein per serving. If you eat dairy and eggs, compare them on the dairy page and the meat, fish and eggs page.

Three sample days, vegetarian and vegan

Calculated from the food pages, using each food’s typical serving or half of it. They’re examples of how to spread protein over five small meals, not calorie plans: they leave out cooking oil and whatever you add as your hunger allows. Totals are calculated before rounding.

Day 1: vegetarian (with dairy and eggs)

With one more glass of soy milk (250 ml, about 1 cup, 7.2 g), the day reaches 84.4 g: the bottom of the range for 154 lb (70 kg).

Day 2: vegan

It adds up to 34.7 g of fiber. That’s well above the 25 g a day the National Academies set for women 50 and younger, and close to the 38 g for men^[5]: it isn’t the day to start with.

Day 3: gentle vegan, for days with nausea or to get started

Only 18.6 g of fiber, but also less protein. If you’re stuck at this level for weeks, talk to a registered dietitian.

For more ideas, the weekly menu planner has a “Vegetarian” preference (it keeps eggs and dairy and leaves out aged cheeses such as Parmesan, which are often made with animal rennet). It doesn’t have a vegan option yet. The high-protein breakfasts and filling meals also work with a few changes: the lentil stew with pumpkin and carrot is vegan, and the Swiss chard and mushroom omelet is vegetarian.

Beans and gas on GLP-1 medications: go up slowly

GLP-1 medications already slow digestion on their own, and constipation is one of their most common side effects. On the US labels, constipation affected 24% of people on Wegovy, versus 11% on placebo^[7], and 17%, 14% and 11% on Zepbound 5, 10 and 15 mg, versus 5% on placebo^[8] (Wegovy label, Zepbound label). The US labels don’t report how long it lasts, but in the EU prescribing information for Wegovy, the median duration was 47 days for constipation, versus 8 days for nausea^[9]. If you also switch overnight to eating beans every day, gas and bloating are to be expected.Dotted underline: a drug-label fact; hover over it to see the date it was checked.

• Go light on fiber in the first few days. The 2025 advisory suggests avoiding fatty or high-fiber foods during the first few days of treatment to ease nausea^[1].
• Then increase gradually. The same advisory recommends a gradual increase in fiber-rich foods, along with enough fluids^[1].
• Eat less of whatever bothers you. The NIDDK, part of the National Institutes of Health, notes that some people get more gas from legumes (beans, peas, lentils) and cruciferous vegetables such as broccoli, and suggests smaller, more frequent meals or eating less of the foods that cause it^[10].

In practice, start with tofu, soy milk or hummus, which are low in fiber, and add beans in half servings: 75 g of lentils (about ⅓ cup) gives 6.8 g of protein and 5.9 g of fiber^[12]. If constipation or nausea is already a problem, I cover them in constipation on GLP-1 medications and nausea on GLP-1 medications: what to eat.

B12, iron and calcium: what to ask about

The 2025 advisory lists iron, calcium and vitamin B12, among others, as nutrients of concern when intake drops a lot^[1]. On a plant-based diet, these three are worth discussing with your doctor or a registered dietitian. The Academy says individual assessment should come before any specific supplement recommendation^[2].

• Vitamin B12. According to the Academy, B12 deficiency is common among vegetarians and especially vegans, and B12 supplements may be the easiest and most reliable way to ensure adequate status^[2]. Ask whether you need a blood test and how to cover it in your case.
• Iron. Vegetarian diets may be linked to lower iron stores (ferritin), although the evidence is of very low certainty. The Academy suggests eating iron-rich plant foods with a good source of vitamin C, which improves absorption, and cutting back on inhibitors such as coffee at the same meal^[2].
• Calcium. Vegans tend to eat less of it. The Academy recommends at least 2 to 3 daily servings of calcium-rich foods that absorb well, such as calcium-fortified soy milk, calcium-set tofu, dark leafy greens such as kale, and calcium-fortified orange juice^[2].

I don’t give supplement doses: they depend on your lab results.

Eat well, not as little as possible

A plant-based diet plus a GLP-1 medication can make you eat very little without noticing. The goal is to eat enough, not the minimum.

If food causes you distress, you skip meals to make up for eating, or restricting gives you a sense of control, talk to a healthcare professional. MedlinePlus describes eating disorders as serious mental health disorders and stresses the importance of seeking help^[11].

Frequently asked questions

Can you get enough protein as a vegan on Ozempic or Zepbound?

Yes, with more volume and planning. Our sample vegan day adds up to 70.1 g; reaching 80 g or more takes beans or soy at almost every meal.

Do I have to combine beans and grains at the same meal?

No. The Academy of Nutrition and Dietetics explains that a variety of plant foods eaten over the course of the day supplies all the essential amino acids, as long as you meet your energy needs^[2].

Is soy a good protein source?

Yes. The Academy calls soy a high-quality, well-digested protein^[2], and tofu and soy milk give a lot of protein per calorie with little fiber^[12].

Do beans make nausea or gas worse?

They can cause gas, especially if you ramp up all at once. The 2025 advisory suggests avoiding high-fiber foods in the first few days of treatment and increasing them gradually after that^[1].

Do I need plant-based protein powder?

Not necessarily. The advisory mentions high-protein shakes, bars and fortified products for people who can’t reach their target with food^[1]. Check with your doctor or a registered dietitian first, especially if you have kidney disease.

What about tempeh, edamame, seitan or TVP?

They can help, but they aren’t in our database yet. Check the protein per serving on the Nutrition Facts label. Seitan is made from wheat gluten, so it isn’t an option if you have celiac disease.