GLP-1 Protein Calculator
Calculate your optimal daily protein intake while taking GLP-1 medications like Ozempic, Mounjaro, or Zepbound. Adequate protein is critical to prevent muscle loss during weight loss.
Results are estimates only — consult your healthcare provider before making medical decisions.
Your Daily Protein Target
Based on 1.8 g/kg of body weight (includes +0.4 g/kg GLP-1 adjustment to help preserve lean muscle mass)
High-Protein Food Sources
Prioritize these protein-rich foods to hit your daily target:
| Food | Serving Size | Protein |
|---|---|---|
| Chicken Breast | 100g (3.5 oz) | 31g |
| Eggs | 1 large egg | 6g |
| Greek Yogurt | 100g (3.5 oz) | 10g |
| Salmon | 100g (3.5 oz) | 25g |
| Tofu (firm) | 100g (3.5 oz) | 8g |
| Whey Protein | 1 scoop (~30g) | 25g |
Why GLP-1 Users Need More Protein Than the Average Person
GLP-1 receptor agonists like Ozempic (semaglutide) and Mounjaro (tirzepatide) are among the most effective weight-loss medications ever studied. But their power comes with an important nutritional challenge: rapid caloric restriction — even when appetite-suppressed — can cause the body to break down lean muscle for energy, a process called muscle catabolism.
The standard dietary reference intake (DRI) for protein is just 0.8 g per kg of body weight per day — designed for sedentary adults maintaining weight. That recommendation is entirely inadequate for someone losing 1–2 lbs per week on a GLP-1 medication.
Clinical Evidence for Higher Protein Needs
The Obesity Medicine Association (OMA) recommends that GLP-1 medication users consume 1.2 to 1.6 grams of protein per kilogram of body weight daily to minimize lean mass loss during active weight loss (OMA Clinical Practice Statement, 2023). Active individuals or those also resistance training may need up to 1.8–2.0 g/kg.
A 2021 position stand by the International Society of Sports Nutrition (ISSN) confirms that protein intakes above 1.6 g/kg provide added muscle-protection benefits during caloric deficits, especially for older adults who are more prone to sarcopenia (Jäger et al., Journal of the International Society of Sports Nutrition, 2017).
In a sub-analysis of the STEP-1 trial (Wilding et al., NEJM, 2021), participants who maintained higher protein intakes preserved significantly more lean mass compared to those with lower protein consumption — even at equivalent calorie deficits. This makes protein tracking one of the single most impactful dietary behaviors for GLP-1 users.
Protein Needs by GLP-1 Medication
| Medication | Typical Calorie Reduction | Recommended Protein (g/kg/day) | Example: 180 lb (82 kg) person |
|---|---|---|---|
| Ozempic (semaglutide) | ~30–40% reduction | 1.2–1.6 g/kg | 98–131 g/day |
| Wegovy (semaglutide 2.4mg) | ~35–45% reduction | 1.2–1.6 g/kg | 98–131 g/day |
| Mounjaro / Zepbound (tirzepatide) | ~40–50% reduction | 1.4–1.8 g/kg | 115–148 g/day |
Best High-Protein Foods for GLP-1 Users
Because GLP-1 medications significantly reduce stomach capacity and appetite, choosing protein-dense, low-volume foods is essential. Avoid high-fat protein sources (e.g., fatty beef) that may worsen nausea. Prioritize easily digestible options:
- Chicken breast (cooked): 31g protein per 100g — lean, versatile, easy to digest
- Greek yogurt (plain, 0%): 10g per 100g — great for snacks, also provides probiotics
- Eggs: 6g per egg — complete protein with all essential amino acids
- Salmon: 25g per 100g — high protein plus omega-3 anti-inflammatory benefits
- Cottage cheese (low-fat): 11g per 100g — slow-digesting casein protein, keeps you full
- Edamame: 11g per 100g — plant-based complete protein, high in fiber
- Whey protein powder: 25g per scoop — ideal when solid food feels difficult
- Tofu (firm): 8g per 100g — great plant-based option, versatile in cooking
- Tuna (canned in water): 25g per 100g — affordable, portable, low-fat
- Shrimp: 20g per 100g — low-calorie, low-fat, high-protein seafood
Tips for Hitting Your Protein Target on GLP-1s
- Eat protein first at every meal. GLP-1 medications cause early satiety — if you eat carbs or fat first, you may not have room for your protein goal.
- Use protein shakes strategically. On days when nausea is high or appetite is very low, liquid protein is easier to get down than solid food.
- Spread protein across 3+ meals. The body can optimally utilize roughly 25–40g of protein per meal for muscle synthesis. Spacing it out maximizes absorption.
- Track with an app. Most people significantly underestimate their protein intake. Using MyFitnessPal or Cronometer for at least the first few weeks helps calibrate your diet.
- Pair protein with resistance training. Lifting weights 2–3x per week activates mTOR signaling, which directs amino acids toward muscle synthesis rather than energy.