An explained range for a planning conversation
The 2025 joint advisory discusses 1.2–1.6 g of protein per kilogram per day as a proposed range during active weight reduction. This calculator applies that range to the weight you select. It is not a medication-specific requirement or an individualized prescription.
The midpoint is used only to illustrate a meal split. It is not more accurate than the range. Your clinician or registered dietitian can help choose an appropriate personal target.
Current weight and goal weight are different assumptions
The advisory notes uncertainty about whether protein calculations in obesity should use actual weight, adjusted weight, or fat-free mass. Actual weight can overestimate needs. A self-entered goal weight is not automatically an adjusted weight or a lean-mass estimate.
This tool makes the chosen basis visible. It does not select a goal weight for you. Switching to goal weight requires you to enter it; no hidden default goal is applied.
Check the arithmetic
Example basis: 80 kg.
80 × 1.2 = 96 g · 80 × 1.6 = 128 g
The midpoint is 112 g. An even split across four meals is about 28 g per meal. This is an arithmetic example, not a meal prescription.
Keep useful observations together
A protein number alone does not describe a day. You can record meals, approximate protein, completed training, and questions you want to take to your care team. Keep any treatment decisions with that team.
The advisory also emphasizes that protein alone is insufficient for preserving muscle without appropriate resistance training. A tracking tool cannot determine which training plan is suitable for you.
Common questions
Does the result depend on which GLP-1 medication I use?
No. This tool does not ask for a medication or dose, and does not infer or recommend treatment changes.
Why is this different from Brolic’s general protein calculator?
The general calculator uses a fitness-oriented range for lifters. This page uses the proposed active-weight-loss range discussed in the joint GLP-1 nutrition advisory. They serve different planning contexts.
What if I already have a protein target from my clinician?
Use your individual plan. This general calculator does not override it, particularly when you have a condition that changes your nutritional needs.
Do I need to eat the same amount at every meal?
No. The meal split is a simple way to visualize the midpoint, not a requirement for meal timing or equal portions.
Sources & method
Written by the Brolic team. These references explain the evidence and assumptions; this page does not replace individualized professional advice.
- Nutritional priorities to support GLP-1 therapy for obesity — Joint advisory (2025) — American College of Lifestyle Medicine, American Society for Nutrition, Obesity Medicine Association, and The Obesity Society.
- Joint advisory — full-text PDF — See the section on preservation of muscle and bone mass.