Daily Protein Target Calculator for GLP-1 Users

Here is the trap nobody warns you about. The medication quiets your appetite, the scale moves, and you feel like it is working. Meanwhile the protein on your plate quietly drops to half of what it was. Months later the scale is happy and your body composition is not. That gap, between weight lost and muscle kept, is the whole game on GLP-1 medication. And it comes down to one number you can set today.

Most adults losing weight on GLP-1 medication are pointed toward roughly 1.2 to 1.6 grams of protein per kilogram of body weight per day. That is a research-based range for preserving lean mass during weight loss, not a prescription or medical advice. Your physician and a dietitian set your real target. Individual needs vary.

What you will learn

• The protein range the research points to, and why it climbs when you are eating less
• How to turn that range into a daily gram number for your body
• Why muscle, not just fat, is on the line during fast weight loss
• How to hit a high protein target when your appetite has gone quiet
• What a good GLP-1 provider does to protect your muscle, not just your scale weight
• Where to find your number with our free protein calculator

Here is the counterintuitive part. As you eat less, your protein need per pound goes up, not down. Your body still has to repair muscle and tissue on a shrinking food budget. Older adults need even more, because the body answers protein less efficiently with age. The research range for muscle preservation during weight loss sits at 1.2 to 1.6 g/kg per day. This is education, not medical advice.

How much protein does the research actually point to?

For adults with overweight or obesity eating in a calorie deficit, a daily protein intake between 1.2 and 1.6 grams per kilogram of body weight has been proposed during active weight loss to help preserve lean mass, and a meta-analysis of weight-loss trials found higher protein intake helped adults with overweight or obesity retain muscle mass ¹². That is well above the baseline RDA of 0.8 g/kg ¹, which was set to prevent deficiency, not to protect muscle during weight loss.

A quick translation. For a person who weighs 80 kilograms (about 176 pounds), 1.2 to 1.6 g/kg lands at roughly 96 to 128 grams of protein a day. Our free protein calculator does this math for you from your own weight.

One caution worth saying plainly. Very high protein can be a concern for people with certain kidney conditions. This is exactly why your number should be confirmed by a clinician who knows your labs, not pulled from a blog. We will say that more than once.

Why is muscle the thing at risk, not just fat?

Because some of what you lose is lean mass, and that part is harder to win back. Across clinical trials, the lean mass portion of total weight lost on GLP-1 therapy generally runs about 20 to 30 percent when nothing is done to protect it ³. The fat goes, which is the goal. But muscle can ride along for free if protein and training are missing.

The reassuring news. It is not fixed in stone.

A 2026 Cell Reports Medicine analysis in mice and humans found that weight loss with GLP-1 medicines did not cause a disproportionate loss of muscle mass or function ⁴. In plain terms, the medication is not draining muscle on purpose. What protects you is the food and the training around it. Individual results vary.

The math is simple once you have your weight in kilograms. Take your body weight in kilograms, then multiply by 1.2 for the low end and 1.6 for the high end of the research range. That gives a daily protein band in grams. Pounds divided by 2.2 gives kilograms. Or skip the arithmetic and use the sipra protein calculator. Your clinician confirms the target.

Do I use my current weight or my goal weight?

This is a fair question, and the honest answer is that it depends on where you are starting. Many clinicians anchor the calculation to a healthy reference weight rather than a high starting weight, so the gram target is not inflated. The systematic review evidence is built on body weight in the 1.2 to 1.6 g/kg band ². The calculator uses current weight as a transparent default and shows the band, so you and your clinician can adjust. This is not medical advice.

What does the number look like in real food?

Grams on a screen are abstract. Plates are not. Here is a rough sense of scale, not a meal plan.

• A palm-sized chicken breast: roughly 30 to 35 grams
• A cup of Greek yogurt: roughly 20 grams
• Three large eggs: roughly 18 grams
• A scoop of protein powder: roughly 20 to 25 grams
• A cup of lentils: roughly 18 grams

Spread across three eating moments, those add up fast. The trick on GLP-1 medication is not eating more total food. It is making the small amount you do eat protein-first.

Find your daily protein band. The sipra protein calculator takes your weight in pounds and a goal, including weight loss with muscle preservation, and returns a range in grams with a simple per-meal figure. Treat the output as a starting point for a conversation with your care team, not a final answer.

Protein sets the table. Resistance training does the building. The strongest results come when the two run together, and a good provider treats both as part of the plan, not an afterthought. None of the below is a dosing instruction or a personal medical directive. It is the general shape of the evidence.

Does protein alone protect muscle, or do I need to lift?

Protein helps, but the pairing is what moves the needle. A 2025 study presented at the European Congress on Obesity followed 200 adults who received education on resistance training and protein intake when starting a GLP-1 medication, and its authors concluded that, with close physician supervision, muscle loss can be minimized ⁵. Individual results vary.

Table values describe published study conditions, not a promise for any individual. Individual results vary.

Here is a quiet filter for choosing care. A good GLP-1 provider does not hand you a syringe and disappear. It includes physician follow-up that checks how you are eating, asks about protein, and watches for muscle loss, not just the number on the scale. It connects you with guidance on nutrition and training. And it makes that follow-up part of the plan, not an upsell.

If a provider only tracks pounds and never asks what is on your plate, that is a gap. Ask any provider you are considering one direct question. Who helps me protect my muscle while I lose weight, and is that included? (This is one of the things sipra was built around. Here is how that follow-up works: physician follow-up on sipra.)

You do not need a perfect plan. You need a first number and a first plate.

1. Find your band. Use the protein calculator to turn your weight into a daily protein range in grams. Write it down.
2. Build protein-first. Put protein on the plate before anything else, at every eating moment, even the small ones.
3. Confirm and protect. Bring the number to your physician or dietitian, and pair your protein with two resistance sessions a week. A provider like sipra includes the follow-up that checks you are actually keeping muscle, not just losing weight.

This article is educational and is not medical advice. The protein ranges here are drawn from published research and are not a treatment plan for any individual. Talk with your physician or a registered dietitian before changing your protein intake, especially if you have a kidney condition.

Keep going next with GLP-1 protein needs, resistance training on GLP-1, and the hub, preserving muscle on GLP-1. For the bigger picture on muscle and metabolism, see GLP-1 muscle loss and metabolism.