How much protein on a GLP-1? The published numbers, worked through
By The LeanGLP Team · Last verified
Educational nutrition information, not medical advice. Nothing here diagnoses, treats, or prevents any condition. Talk to your prescriber or a registered dietitian before changing your diet, supplements, or training.
"Eat more protein" is the most repeated and least specific advice given to people starting a GLP-1 medication. I wanted the actual number, derived from published standards, so I read the position stands and meta-analyses and implemented them as a calculator. This guide is the companion: where the numbers come from, and the honest caveats.
Short version: 1.2-1.6 g of protein per kg of adjusted body weight per day. For most adults that computes to roughly 75-125 g/day — almost always more than you're eating once appetite suppression kicks in, and almost always less than the "1 g per pound" folklore from bodybuilding forums.
Skip the arithmetic — the calculator applies these formulas to your numbers and splits the result into meals.
Get your protein target free — 1 minute, no email →Where 1.2-1.6 g/kg comes from
Three strands of evidence converge on this band for people intentionally losing weight:
| Source | Population | Finding |
|---|---|---|
| Leidy et al., Am J Clin Nutr 2015 | Weight-loss review | ~1.2-1.6 g/kg/day described as beneficial for lean mass and satiety during energy restriction |
| Kim et al., Nutr Rev 2016 (meta-analysis) | Adults in caloric restriction | Higher-protein diets (≥25% of energy or ~1.2+ g/kg) preserved more lean mass than normal-protein diets |
| Morton et al., Br J Sports Med 2018 (meta-analysis) | Resistance-training adults | Benefits of added protein plateau at ~1.6 g/kg/day total intake |
| Jäger et al., ISSN position stand, JISSN 2017 | Exercising individuals | 1.4-2.0 g/kg/day general recommendation |
| Bauer et al., PROT-AGE, J Am Med Dir Assoc 2013 | Adults 65+ | At least 1.0-1.2 g/kg/day baseline, more with illness or training |
Note what's not on that list: GLP-1-specific protein RCTs. Dedicated trials are still emerging, so like every credible source right now, we extrapolate from the general weight-loss and resistance-training literature. The physiology being managed — an energy deficit eating into lean mass — is the same; the medication mostly changes how large and sustained the deficit is.
For comparison, the RDA is 0.8 g/kg/day — but the RDA is a minimum for weight-stable adults, set to prevent deficiency, not a target for someone in a deep, months-long energy deficit. Using the RDA during rapid weight loss answers the wrong question.
The part most calculators get wrong: which weight?
Multiply 1.6 g/kg by a 250 lb (113 kg) body and you get 181 g of protein — a discouraging, unnecessary number that no suppressed appetite will ever meet. Protein requirements track lean tissue, and total body weight is a poor proxy for lean tissue at higher body weights.
Standard clinical-nutrition practice solves this with adjusted body weight: when actual weight exceeds ~120% of the Devine ideal-body-weight estimate for your height and sex, the g/kg range is applied to IBW + 25% of the excess instead. Worked example, 5'5" woman at 220 lb (100 kg):
| Step | Value |
|---|---|
| Devine IBW (5'5" female) | 45.5 + 2.3 × 5 = 57 kg |
| 120% of IBW | 68 kg → adjustment applies |
| Adjusted weight | 57 + 0.25 × (100 − 57) = 68 kg |
| Protein range (1.2-1.6 g/kg) | 80-110 g/day |
80-110 g is achievable on four small meals. 180 g was fantasy. That difference is why this site's calculator asks for height and sex instead of just weight.
Hitting the number when you're not hungry
The daily total is won or lost meal by meal. Three patterns that survive contact with a suppressed appetite:
- Protein first, always. Eat the protein portion of the meal before anything else. Fullness arrives fast and early on these medications; make sure it arrives after the chicken, not after the rice.
- Count by meals, not by day. A 100 g target is "25-30 g, four times." A single-serve Greek yogurt (17 g) plus an egg (6 g) is most of a meal's quota. The per-meal breakdown has the full logic.
- Keep zero-effort protein in the house. Cottage cheese, tuna pouches, shakes, string cheese. On the days cooking fails — and there will be those days — the target survives on ready-to-eat options. The snacks guide lists them with USDA protein counts.
Honest caveats
- Kidney disease changes everything. Protein targets for chronic kidney disease are individualized and often lower — that's a clinician conversation, not a calculator's.
- These are population formulas. Devine IBW is a 1974 heuristic; a DXA scan or a dietitian's assessment beats it. The formulas earn their place by being the validated, transparent standard — not by being perfect.
- The range is a floor for effort, not a ceiling for guilt. A day at 70 g when the target is 95 g is not failure; a month averaging 50 g is a problem worth solving with your care team.
Every constant on this page is implemented, tested, and rendered live on the methodology page — if we change the math, that page changes with it.
Frequently asked questions
Is 100 g of protein a day enough on a GLP-1?
For many people, yes — 100 g lands inside the 1.2-1.6 g/kg adjusted-body-weight range for a large share of adults. Whether it's enough for you depends on your height, weight, and training; the calculator applies the published formulas to your numbers in about a minute.
Can you eat too much protein on a GLP-1?
For healthy kidneys, intakes above the 1.2-1.6 g/kg range aren't dangerous in the studied ranges, but they crowd out other food on a small appetite without adding much preservation benefit — the Morton 2018 meta-analysis found muscle benefits plateau around 1.6 g/kg/day. People with kidney disease need an individualized target from their clinician.
Does protein need change as I lose weight?
Slowly, yes. The target scales with your adjusted body weight, which falls as you lose weight. Re-running the calculator every 10-15 lb keeps the target honest — most people find the number drops by 5-10 g per 20 lb lost.