GLP-1 Protein Calculator

What the 1.2–1.5 g/kg Target Is

This range comes from obesity-medicine guidance published in 2024 by Almandoz and colleagues in the journal Obesity. It sits at the upper end of general protein recommendations and applies specifically to patients on GLP-1 receptor agonists — semaglutide (Ozempic, Wegovy), tirzepatide (Mounjaro, Zepbound), liraglutide (Saxenda), or dulaglutide. The target aims to preserve muscle during weight loss and pairs with resistance training at least twice a week.

Why a range rather than a point? Because weight loss speed, training status, and starting body composition all shift where you belong inside it. Losing more than roughly 1% of body weight per week puts you at the higher end. The calculator flags that condition and suggests 1.5 g/kg. Losing less, or already lean, keeps you near the midpoint at 1.35 g/kg unless you're lifting heavy.

Why Protein Matters More on GLP-1 Than a Normal Deficit

GLP-1 medications suppress appetite hard enough that under-eating protein becomes the default failure mode. Without deliberate planning, most patients drift below 60 g a day, which is half what clinical guidance recommends for someone at 80 kg. Body-composition substudies from the STEP trials show lean mass falling alongside fat, with muscle loss accounting for 25–40% of total weight reduction when protein stays low.

A normal calorie deficit lets you feel hunger and adjust. Semaglutide or tirzepatide blunts that signal so effectively that you can hit a deficit large enough to trigger muscle catabolism while never feeling deprived. Protein has to go on the fork first, before carbohydrate or fat, because there's no appetite cue reminding you to eat it. That's the structural difference: the medication removes the feedback loop that usually guards protein intake during weight loss.

Resistance training amplifies the benefit. Protein alone slows muscle loss; training alone does the same. Both together preserve lean mass far better than either in isolation. The evidence pairs 1.2–1.5 g/kg with two or more weekly sessions. Skip one and you keep some of the effect. Skip both and the weight you lose skews heavily toward muscle, which is why clinical guidelines link the two.

What the Target Looks Like as Food

Numbers mean nothing until they turn into portions. At 80 kg the midpoint of the range is 108 g a day, split across four eating occasions that's 27 g each. The table below shows realistic servings from dense protein sources, not per-100 g figures that fail at the kitchen counter.

Values from USDA FoodData Central, rounded to the nearest gram.

Chicken breast, Greek yogurt, cottage cheese, tuna, eggs, and whey deliver 25–37 g per serving for 110–200 kcal. That density matters on a suppressed appetite because volume becomes the constraint. A 200 g serving of Greek yogurt goes down easier than 200 g of chicken when nausea limits what you can tolerate, which is why softer, colder, or liquid protein sources often work better. For a longer list with plant options, see our guide to high-protein foods.

Eating the Target When Nausea Limits Volume

Appetite suppression on GLP-1 medications isn't subtle. Most patients report feeling full after a few bites, and nausea or early satiety makes large meals impossible. Hitting a protein target under those conditions takes strategy, not willpower. The tactics below come from what works in practice, not from a textbook.

Eat protein first. Before carbohydrate, before fat, before anything else on the plate. If you fill up after four bites, make those four bites chicken or cottage cheese rather than rice or bread. Front-loading protein guarantees you clear the threshold for muscle synthesis even if the meal ends early.

Split your target into smaller, more frequent servings. Four or five eating occasions of 20–27 g each sit better than three meals of 35 g when your stomach empties slowly. Snacks count: Greek yogurt at 10 a.m., a protein shake at 3 p.m., two eggs before bed. Frequency compensates for reduced volume per sitting.

Choose softer, colder, or blended options. Greek yogurt, cottage cheese, protein shakes, scrambled eggs, and tuna salad go down easier than steak or dry chicken when nausea peaks. Temperature matters too; cold foods often tolerate better than hot meals during the first few weeks on medication or after a dose increase.

Whey or plant-based protein powder solves the volume problem. A 30 g scoop in water delivers 25 g of protein in under 250 ml of liquid, which is far less filling than the equivalent from solid food. If chewing feels like work, blend it. If sweetness triggers nausea, use unflavored isolate.

GLP-1 Protein Questions, Answered

• How much protein should I eat on Ozempic or Wegovy? Clinical guidance recommends 1.2–1.5 g per kilogram of body weight per day for patients on semaglutide-based medications like Ozempic or Wegovy, paired with resistance training. At 80 kg that's 96–120 g daily. The upper end applies if you're losing more than about 1% of your body weight per week.
• Is protein more important on GLP-1 medications than on a regular diet? Yes. Weight lost on GLP-1 medications includes lean tissue alongside fat. Research shows that 20–40% of the weight lost can be muscle if protein intake and resistance training aren't prioritized. The suppressed appetite makes it easy to under-eat protein by default.
• What's the difference between Ozempic, Wegovy, and Mounjaro protein needs? The protein target is the same for all GLP-1 receptor agonists: 1.2–1.5 g/kg. Tirzepatide (Mounjaro, Zepbound) is a dual agonist and may produce faster weight loss, which pushes you toward the upper end of the range, but the baseline guideline doesn't change between drugs.
• Should I calculate protein from my current weight or goal weight on GLP-1 medication? Use your actual body weight unless your BMI exceeds about 30, in which case adjusted body weight gives a more realistic target. The calculator uses current weight because the clinical evidence bases its recommendations on actual weight, not projected loss.
• How do I eat enough protein when I'm not hungry? Eat protein first at every meal before other foods. Choose softer, colder, or blended high-protein options like Greek yogurt, cottage cheese, or protein shakes when nausea limits volume. Split your target across 4–5 smaller eating occasions rather than three large meals.
• Can I use protein powder on GLP-1 medications? Yes. A protein shake delivers 25 g in about 30 seconds with minimal volume, which is easier to tolerate than solid food when appetite is suppressed. Whey isolate or plant-based blends work equally well.
• Will eating more protein prevent muscle loss on Ozempic? Protein alone won't prevent it. The evidence pairs 1.2–1.5 g/kg with resistance training at least twice a week. Both together preserve lean mass during weight loss. Protein without training still loses muscle, and training without adequate protein limits the benefit.

Medical Disclaimer: This calculator is for educational purposes only and does not constitute medical advice. GLP-1 medications are prescription drugs that require supervision by a licensed healthcare provider. Do not start, stop, or adjust medication doses without consulting your prescriber. Protein targets should be discussed with your doctor or dietitian, especially if you have kidney disease, liver conditions, or other medical concerns. This tool does not provide dosing guidance or treatment recommendations.