How much protein should I eat on Ozempic or Mounjaro?
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The same typical range as anyone losing weight, 1.2 to 1.6 g per kg a day, counted near your goal if you have a lot to lose. Eat it in small meals with the protein first, and lift weights at least twice a week. For a 5 foot 6 woman at 210 lb aiming for 160, that’s 110 to 145 g. The 2025 GLP-1 advisory also allows a flat 80 to 120 g a day. The Gyroscope app personalizes yours.
A lot of people hear two scary things at once. One is that these drugs melt muscle, usually with a big percentage attached that turns out to be lean mass, which includes water and organs. The other is that you need a huge amount of protein to stop it, on a drug that turns your appetite way down. The body scans from the trials are a lot less scary on both counts.
We’d treat semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound) like any big weight loss, because the muscle numbers look like any big weight loss. Aim for the typical range. If eating that much isn’t possible on a given day, the advisory’s 80 g is the floor we’d hold. And lift, since lifting is what tells the body to keep its muscle.
A GLP-1 turns the volume down on hunger. Protein stops arriving by accident, so it has to be put on the plate on purpose, the way you set an alarm for something you’d otherwise forget.
How much muscle do people lose?
| Drug and trial | People scanned | Fat lost | Lean mass lost | Lean share of the loss |
|---|---|---|---|---|
| Tirzepatide, SURMOUNT-1 | 160 | 33.9% of their fat | 10.9% of their lean mass | about a quarter, the same as on placebo |
| Semaglutide, STEP 1 | 140 | 19.3% of their fat | 9.7% of their lean mass | about 38% of the fat and lean tissue lost |
In SURMOUNT-1, about 75% of the weight lost was fat and 25% was lean mass, in the tirzepatide group and the placebo group alike. In STEP 1, about 38% of the fat and lean tissue lost was lean mass, and lean mass isn’t all muscle. It counts everything that isn’t fat or bone, including water and organs. The advisory estimates that muscle was about 20% of the weight lost.
There’s an encouraging sign from SEMALEAN, a study of 115 people on semaglutide with no comparison group. Lean mass dropped about 7 lb (3 kg) by month seven and then held steady, and grip strength went up by 10 lb (4.5 kg) at 12 months.
What the 2025 advisory says
Four US societies (the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association and The Obesity Society) wrote joint nutrition advice for GLP-1 treatment in 2025. On protein they give options instead of one number: 1.2 to 1.6 g per kg during weight loss, 1.2 to 2.0 g per kg of an adjusted body weight in major weight loss, or a flat 80 to 120 g a day to keep it simple. They say it’s unclear which body weight the targets should use. They suggest small, frequent meals when appetite is low, protein-rich foods first in the meal, shakes or other high-protein products if they help, strength training at least three times a week and at least 150 minutes of moderate activity.
| For the 210 lb woman aiming for 160 | Protein a day |
|---|---|
| This site’s typical range (counted from 202 lb) | 110 to 145 g |
| The advisory’s flat option | 80 to 120 g |
How to eat it when you’re not hungry
- Protein first. Eat the yogurt, eggs, fish or chicken before the bread, rice or pasta.
- Small and dense. A 5.3 oz nonfat Greek yogurt has 15 g in 88 calories, and 3 oz of shrimp has 20 g in 84. See what to eat on Ozempic when you’re not hungry for a full day.
- Lift. Two days a week at the least, three if you can, as the advisory suggests.
- Count it once. Photograph a few days to see where you really land. Am I eating enough protein? adds up your normal day against your range.
Call your prescriber if you can’t keep food or fluids down. The advisory warns that vomiting or diarrhea can dehydrate you enough to injure the kidneys. This page doesn’t cover doses or stopping, which stay with your prescriber.
bodyfat.guide covers how the drugs work and whether they make you lose muscle. Our GLP-1 guide goes deeper on protein.
What the guidelines say
Checked November 14, 2026:
- The 2025 GLP-1 nutrition advisory (four US societies): 1.2 to 1.6 g per kg during weight loss, 1.2 to 2.0 g per kg of adjusted weight in major loss, or 80 to 120 g a day, and it says the right body weight is unclear.
- The 2025 to 2030 Dietary Guidelines for Americans (January 2026): 1.2 to 1.6 g per kg of body weight a day for adults, with protein at every meal.
5 sources
- Mozaffarian et al., Nutritional priorities to support GLP-1 therapy for obesity: a joint advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association and The Obesity Society, 2025pmc.ncbi.nlm.nih.gov
- Look et al., Body composition changes during weight reduction with tirzepatide in the SURMOUNT-1 study of adults with obesity or overweight, Diabetes, Obesity and Metabolism, 2025pubmed.ncbi.nlm.nih.gov
- Wilding et al., Impact of semaglutide on body composition in adults with overweight or obesity: exploratory analysis of the STEP 1 study, abstract, Journal of the Endocrine Society, 2021newswise.com
- Alissou et al., Impact of semaglutide on fat mass, lean mass and muscle function in patients with obesity: the SEMALEAN study, Diabetes, Obesity and Metabolism, 2026pubmed.ncbi.nlm.nih.gov
- US Department of Agriculture and US Department of Health and Human Services, Dietary Guidelines for Americans, 2025 to 2030, January 2026cdn.realfood.gov
