GLP-1 Protein Calculator

Use evidence-based protein ranges as a calmer reference point while appetite feels unpredictable on GLP-1s.

Your Profile

23456
Daily Protein Target
116grams

Based on 1.6g per kg of your reference body weight (73 kg) at activity level: Moderate (3–5 days/week)

0gYour target: 116g139g
Per Meal Target
39g

Across 3 meals/day. Aim for this in each sitting — your stomach is smaller on GLP-1s.

Lean Mass at Risk
~13lbs

Without adequate protein, up to 32% of weight lost can be lean muscle. This is what you're protecting.

Why protein is critical on GLP-1s

The STEP and SURMOUNT trials showed that without protein intervention, 25–39% of total weight lost on semaglutide and tirzepatide can come from lean muscle mass — not fat. This is known as the fat-free mass (FFM) preservation problem. Higher protein intake combined with resistance exercise is the primary evidence-based countermeasure endorsed by the Obesity Medicine Association.

Sources: STEP 5 (Wilding 2022) · SURMOUNT-1 (Jastreboff 2022) · Stokes et al. 2018 (Protein targets)

Based on Peer-Reviewed ResearchOMA Guidelines 2024

How Much Protein Do I Need on Semaglutide or Tirzepatide?

GLP-1 medications like Wegovy, Ozempic, Mounjaro, and Zepbound often reduce appetite and body weight quickly enough that protein can become easier to under-eat than most people expect. That is why many clinicians and nutrition professionals treat protein as an important supportive target during active weight loss.

The Lean Mass Problem

The landmark STEP 5 (Wegovy/semaglutide) and SURMOUNT-1 (Mounjaro/tirzepatide) clinical trials found that between 25–39% of total weight lost on these medications came from lean (muscle) mass, not fat. This is a known phenomenon called fat-free mass (FFM) loss during caloric restriction.

Losing muscle mass can affect strength, recovery, and long-term body composition. Protein is not the only factor, but it is one of the easier variables to track and improve when your appetite is inconsistent.

How Much Protein Do You Actually Need?

The Obesity Medicine Association (OMA) and major sports nutrition bodies recommend 1.2–2.0 grams of protein per kilogram of goal body weight for people on weight-loss medications. This is 2–3× higher than the standard RDA (0.8g/kg), which is designed only to prevent deficiency, not to preserve muscle during active weight loss.

  • Sedentary (1.2 g/kg): Minimum to prevent deficiency and slow muscle loss.
  • Light activity (1.4 g/kg): Suitable for daily walkers and light exercisers.
  • Moderate (1.6 g/kg): The recommended baseline for most GLP-1 users who do regular exercise.
  • Active (1.8 g/kg): For those doing consistent resistance training 5+ days per week.
  • Very active athletes (2.0 g/kg): For competitive athletes or those in daily strength training programs.

Practical Tips for Hitting Your Target

Since GLP-1 medications can make full meals feel less appealing, eating enough protein in smaller portions is a real challenge. Here are a few practical ideas many people use:

3 Strategies to Hit Your Protein Target

1. Eat protein first at every mealSince GLP-1s cause early satiety (you get full quickly), always eat your protein source — chicken, eggs, fish, Greek yogurt — before vegetables, carbs, or anything else. Once you're full, the protein is already in.
2. Use protein shakes as a safety netOn days when nausea is high or appetite is very low, a protein shake can be an easier way to add 25-40g of protein without much food volume. Think of it as a supportive option, not a perfect-food test.
3. Track for the first 2–4 weeksMany GLP-1 users underestimate how far off their intake is. Tracking for a short window can build awareness, even if you do not want to log in detail forever.

Ready for a GLP-1 week that feels less random?

Use Dosio to notice the patterns behind side effects, appetite shifts, schedule changes, and progress.

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Frequently Asked Questions

This estimator uses data from the FDA-approved clinical trials (STEP 1 for Wegovy/Ozempic and SURMOUNT-1 for Zepbound/Mounjaro). It projects the "average" weight loss curve. However, individual results vary significantly based on genetics, lifestyle, dosage adherence, and starting BMI. Some users are "super-responders" losing more, while others may lose less.
Different medications work on different receptors. Semaglutide (Wegovy, Ozempic) targets GLP-1 receptors, while Tirzepatide (Zepbound, Mounjaro) targets both GLP-1 and GIP receptors, which clinical trials suggest may lead to greater average weight loss.
Medication is a tool, not a cure. The most successful patients combine medication with a high-protein diet (to preserve muscle), resistance training, adequate sleep, and hydration. The estimator assumes these standard lifestyle interventions are being followed.

Disclaimer

Not Medical AdviceThis calculator is for informational and educational purposes only. It does not constitute medical advice, diagnosis, or treatment. Always consult with your physician or a registered dietitian before making significant changes to your diet.
Individual VariationProtein needs vary significantly based on medical history, kidney function, age, and other individual factors. People with pre-existing kidney disease should consult their doctor before increasing protein intake.