How Much Protein Do You Need on a GLP-1?

GLP-1 medications like semaglutide and tirzepatide often make you feel full sooner and eat less. That can be helpful, but it also makes it easier to fall short on protein. Getting enough protein, along with strength training, is one of the best ways to help protect muscle while you lose weight.

Key takeaways

• The general adult baseline (RDA) is 0.8 g of protein per kg of body weight per day.
• During active weight loss, a 2025 joint expert advisory suggested about 1.2 to 1.6 g/kg/day, or a simple target of 80 to 120 g/day.
• The same advisory suggested not going above about 2 g/kg/day for long periods.
• Eat protein first at meals and spread it across the day.
• Protein works best paired with resistance training. Ask your clinician about a target that fits your health, especially if you have kidney disease.

Why protein matters more on a GLP-1

When you lose weight, some of it comes from lean mass, which includes muscle. Muscle helps with strength, balance, blood sugar control and everyday energy. Because GLP-1s can cut appetite a lot, people sometimes eat far less protein than they realize.

In 2025, the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association and The Obesity Society published a joint advisory on nutrition during GLP-1 therapy. It called out protein as a priority and noted that protein alone probably isn't enough to keep muscle without structured resistance training. Our post on GLP-1s and muscle loss goes deeper on this.

The numbers, in plain English

These are ranges for healthy adults, not personal prescriptions. Older adults, athletes, pregnant people and people with kidney or liver disease may have different needs.

How to do the math

To use a grams-per-kilogram range, first convert your weight to kilograms:

kg = pounds ÷ 2.2

Then multiply by the low and high ends of the range.

Example (for illustration only): someone who weighs 200 lb.

• 200 ÷ 2.2 = about 91 kg
• 91 × 1.2 = about 109 g of protein per day
• 91 × 1.6 = about 146 g of protein per day

For people with a higher body weight, calculating from total weight can give a very high number. The advisory notes that a target based on lean body mass (about 1.5 g per kg of lean mass) can be more accurate, but you need a body composition measurement for that. That is one reason the simpler 80 to 120 g range exists. A dietitian can help you pick the right method.

Spreading protein across the day

Large meals can feel uncomfortable on a GLP-1. Splitting protein into smaller portions often works better:

• Breakfast: Greek yogurt, eggs, cottage cheese or a protein shake
• Lunch: chicken, tuna, tofu or beans on a salad or in a wrap
• Snack: cheese stick, edamame, jerky or a small handful of nuts
• Dinner: fish, lean meat, lentils or tempeh with vegetables

The advisory suggests eating protein-rich foods first at a meal, before you get full. For more ideas, see high-protein foods for a small appetite.

Tips that make it easier

• Track for a week. A digital food scale and a food-tracking app can show where you actually land. Many people are surprised.
• Keep easy options ready. Hard-boiled eggs, pre-cooked chicken, and single-serve yogurts reduce effort on low-appetite days.
• Use shakes as a tool. A protein shake can cover a meal when eating feels hard.
• Drink fluids too. Higher protein and less food can affect hydration and digestion. See hydration on GLP-1 medications.
• Go easy on heavy, fatty proteins if they make nausea or fullness worse.

When to check with your care team

Talk to your prescriber or a registered dietitian if you:

• Have kidney disease, liver disease or diabetes
• Are losing weight much faster than expected
• Feel weak, dizzy or very tired
• Can't eat enough of anything because of nausea or vomiting

They can adjust your plan and may suggest lab work.

A sample day at about 100 grams

Here is one example of how roughly 100 grams of protein can fit into small meals. Amounts are approximate and vary by brand.

• Breakfast: 3/4 cup plain Greek yogurt with berries (about 17 g)
• Mid-morning: 1 hard-boiled egg (about 6 g)
• Lunch: 3 oz tuna on greens with a few crackers (about 20 g)
• Afternoon: ready-to-drink protein shake (about 25 g)
• Dinner: 3 oz grilled chicken with roasted vegetables (about 26 g)
• Evening: string cheese (about 7 g)

That adds up to about 101 grams. Swap in tofu, lentils or fish to suit your tastes.

The bottom line

Most adults on a GLP-1 do well aiming for more than the basic 0.8 g/kg, often somewhere around 1.2 to 1.6 g/kg or 80 to 120 grams a day, spread across meals and paired with strength training. Use the math as a starting point, then confirm a target with your clinician or dietitian. You can log meals, weight and how you feel in the PepSteady app to spot patterns.

Sources

• Nutritional priorities to support GLP-1 therapy for obesity: A joint advisory (2025), PMC
• The Obesity Society: Nutritional priorities to support GLP-1 therapy
• CDC: Physical activity guidelines for adults

Frequently asked questions