Protein on a GLP-1: Current Weight or Goal Weight?
The short answer
Use the weight you are now. An international expert consensus recommends a protein intake of 1.2–1.5 g per kg of actual body weight per day during the weight-loss phase on GLP-1-based therapy — actual, which means the number on the scale this month, not your goal and not some ideal figure. The reason people reach for goal weight is that the real number looks enormous on a small appetite, and swapping in a smaller weight makes it feel manageable. It also quietly cuts your target at the exact point your body most needs the protein, so the better fix is to aim at the bottom of the range and hit it consistently. Recalculate every few kilograms, because the target comes down as you do.
Try it on this page
Your daily protein target
A number to work from, plus the per-meal figure that matters more when your appetite is small.
Your target
Daily target
131 g
a middle target
Research range
114–163 g
the ISSN band of 1.4–2.0 g per kg of body weight
Per meal
33 g
spread across 4 smaller meals
If that feels impossible right now, start around 98–122 g a day. An expert consensus for the weight-loss phase on a GLP-1 puts protein at 1.2–1.5 g per kg of body weight — a gentler, evidence-based band for exactly this situation. On the days you can barely eat, the protein you get down beats the target you miss entirely.
A planning estimate, not medical advice — protein needs are personal, and anyone with kidney concerns or other medical conditions should set their target with a healthcare provider rather than a calculator.
Every protein calculator asks for a weight and none of them say which one. Here is the answer, why it is that one, and what to do when the figure it produces looks impossible.
The short answer
Your current body weight. When guidance says grams per kilogram, the kilogram is the one you weigh today — an international expert consensus recommends a protein intake of 1.2–1.5 g per kg of actual body weight per day during the weight-loss phase on GLP-1-based therapy. Multiply by that, not by where you are heading.
The protein hub gives the wider range most weight-loss guidance uses and a calculator that does the arithmetic. This page is only about which number you feed it, because that is the step where people quietly go wrong and then wonder why their intake has been low for months.
Why not goal weight
Because the protein is for the body doing the work, and that body is the one you have now. The tissue you are trying to hold onto is here today; so is the appetite suppression, so is the deficit. A target built on a body you do not have yet is a target for a smaller person with smaller needs.
The gap is not academic. If you weigh 110 kg and you are aiming for 75, using goal weight instead of actual knocks roughly a third off your target — for many people that is 40 grams a day, gone, at the point where intake is already the constraint. That is the whole risk in one sentence: the substitution feels like a sensible adjustment and functions as a large cut.
You will see ideal body weight and adjusted body weight in clinical formulas, and those exist for particular purposes in particular settings. They are not what a general weight-loss protein target is built on, and they are not something to apply to yourself from a search result. If you have been given a specific figure by a dietitian or your healthcare provider, theirs wins over any calculator, including ours.
The number moves — recalculate as you go
This is the part that makes current weight less punishing than it first sounds. Your target is not fixed at today’s figure; it falls with you. Lose ten kilograms and a 1.4 g/kg target drops by about fourteen grams a day, all on its own. The hardest version of the number is the one you are looking at right now.
A simple rhythm: recalculate every five kilograms or so, or once a month, whichever comes first. Any more often than that and you are chasing water weight rather than a real change, which is a separate problem covered in how often to weigh yourself. Write the new target down somewhere you will see it, because the old one has a way of surviving in your head for months after it stopped being right.
Is there a ceiling on this?
Yes, and it is worth knowing because it takes the fear out of a large number. A meta-analysis of 49 studies found the muscle and strength payoff from protein combined with resistance training plateaus around 1.6 g of protein per kg of body weight per day. Past that point you are not buying more muscle, so there is no version of this where the answer is simply more.
Read the two facts together and you get a sensible envelope rather than an arms race: somewhere around 1.2 to 1.5 g/kg of what you weigh now during the losing phase, with little reason to push past about 1.6. Can you eat too much protein covers the other end of that in full, including the kidney question that sends most people to this topic in the first place.
When the honest number looks impossible
Sometimes it genuinely is, for now. If your target is 140 grams and you are managing 60, that gap does not close this week, and treating it as pass-or-fail is how people give up on it entirely. Aim at the bottom of the range rather than the middle, and treat every ten grams you add as the win it is — consistent 100 is worth far more than a perfect 140 you hit twice and then abandon.
The tactics are all elsewhere in this cluster and they work: protein first at every meal, three or four smaller anchors instead of two meals you cannot finish, something ready in the fridge for when appetite shows up, a shake to close the last gap. How to get enough protein has the full system, and high-protein foods for a small appetite has the list to build it from.
What not to do is quietly rewrite the maths so the number looks achievable. Using goal weight, or rounding your body weight down, or switching to a lower guideline you found somewhere gentler — each one makes the shortfall invisible instead of smaller. Keep the honest target on the page and miss it; that at least tells you how far off you are.
The cases that are not ours to answer
A few situations need a person rather than a formula. Kidney disease or any condition you have been told to watch your protein for, pregnancy, an eating disorder history, or a dietitian who has already given you a figure — in all of those, your number comes from your healthcare provider and this page does not override it.
Bring something concrete when you ask: what you eat in an ordinary day in grams, what you weigh now, and what you have been aiming for. A specific question about a real intake gets a far more useful answer than asking whether you should be eating more protein.
A protein target only earns its keep if something is asking your body to use it — otherwise it is just an eating chore with a number attached. Mira is the training half: short strength sessions built around the appetite and energy you actually have, with real-time form scoring through your phone, so the grams you fight for have somewhere to go.
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Common questions
Should I use my current weight or my goal weight for protein on a GLP-1?+
Current weight. An international expert consensus recommends 1.2–1.5 g of protein per kg of actual body weight per day during the weight-loss phase on GLP-1-based therapy — actual meaning what you weigh now. Using goal weight can cut a third off the target for someone with a lot to lose, at exactly the point intake is already the hard part. The number falls on its own as you do.
Do I need to recalculate my protein target as I lose weight?+
Yes, but not often. Every five kilograms or so, or once a month, is plenty — more frequently than that and you are reacting to water weight rather than a real change. A 1.4 g/kg target drops by about fourteen grams for every ten kilograms lost, so the figure you are looking at today is the hardest one you will face.
My target comes out at 140 grams and I can barely eat. What now?+
Aim at the bottom of the range rather than the middle, and treat the gap as something you close in increments. A consistent 100 grams beats a perfect 140 you manage twice. Protein first at every meal, three or four smaller anchors rather than two big ones, something ready in the fridge, and a shake for the last stretch — the how-to-get-enough-protein guide has the whole system. What does not help is rewriting the maths so the shortfall stops showing.
What about ideal or adjusted body weight — I have seen those in formulas?+
They exist for particular clinical purposes and are not what a general weight-loss protein target is built on, so they are not something to apply to yourself from a search result. If a dietitian or your healthcare provider has given you a specific figure for your situation, use theirs — it is based on information a calculator does not have.
Keep reading
How Much Protein Do You Need on a GLP-1?
How much protein you need on a GLP-1, in real grams — a per-day and per-meal target to help hold onto muscle while you lose weight, plus how to hit it.
How to Get Enough Protein on a GLP-1
A repeatable strategy to hit your protein on a GLP-1 when appetite is small — eat protein first, anchor small meals, and use a shake to close the gap.
How to Track Protein on a GLP-1
How to count protein on a GLP-1 without logging forever: set a target, learn your regular foods in two weeks, then count meal anchors instead.
Can You Eat Too Much Protein on a GLP-1?
More protein isn’t automatically better — the muscle payoff levels off. What an upper end looks like on a GLP-1, and what actually goes wrong first.
High-Protein Foods for a Small Appetite on a GLP-1
The most protein-dense, low-volume foods for when a few bites fill you up on a GLP-1 — what to grab, how much each gives, and easy no-cook picks.
What Happens If You Don’t Get Enough Protein on a GLP-1?
Falling short is the normal case, not an emergency — what it actually costs, why the ‘signs of low protein’ lists don’t work, and the check that does.
Does Protein Alone Protect Your Muscle on a GLP-1?
Is enough protein enough to hold muscle on a GLP-1, or do you also have to lift? The honest answer — protein is the material, training is the signal.
How Often Should You Weigh Yourself on a GLP-1?
Daily or weekly both work if you read the average, not the reading. How often to weigh yourself on a GLP-1, and when to weigh less often or not at all.