The Complete Protein Guide for GLP-1 Medication Users

Protein is the single most important macronutrient when you're on a GLP-1 medication. It preserves muscle mass, keeps you feeling satisfied between meals, supports your immune system, and helps your body recover from the metabolic changes that come with significant weight loss.

Yet most GLP-1 users aren't getting nearly enough. With a suppressed appetite and smaller portion sizes, protein intake often drops below 50 grams a day — well short of what your body needs to hold onto lean tissue.

This guide breaks down exactly how much protein you need, the best sources, and practical strategies for hitting your targets even when food is the last thing on your mind.

How Much Protein Do You Actually Need?

The standard recommended daily intake (RDI) of 0.8 g/kg is designed for sedentary, healthy-weight individuals maintaining their weight. It is not appropriate for anyone in a caloric deficit, especially one as significant as GLP-1 medications create.

For GLP-1 users, the evidence supports 1.2-1.6 grams of protein per kilogram of current body weight per day.

Here's what that looks like in practice:

At 70kg: 84-112g protein daily
At 80kg: 96-128g protein daily
At 90kg: 108-144g protein daily
At 100kg: 120-160g protein daily

If you're also doing resistance training (which you should be), aim for the higher end of the range.

The Best Protein Sources

Not all protein is created equal. The quality of your protein sources affects how efficiently your body can use them for muscle preservation.

Tier 1 — Complete, high-bioavailability proteins:

• Eggs (whole) — 13g per 2 eggs, complete amino acid profile
• Greek yoghurt — 15-20g per 170g serve, also provides calcium
• Chicken breast — 31g per 100g, lean and versatile
• Salmon — 25g per 100g, plus omega-3 fatty acids
• Whey protein isolate — 25-30g per scoop, highest bioavailability of any protein source

Tier 2 — Good sources with some limitations:

• Cottage cheese — 11g per 100g, slow-digesting casein protein
• Tinned tuna — 25g per 95g tin, convenient but limit to 2-3 tins per week (mercury)
• Lean beef — 26g per 100g, also provides iron, zinc, and creatine
• Tofu (firm) — 17g per 150g, complete plant protein
• Lentils — 9g per 100g cooked, also high in fibre

Tier 3 — Supplementary sources:

• Collagen peptides — 10g per serve, not complete but supports gut, skin, and joints
• Nuts and seeds — 5-7g per 30g, high in calories relative to protein
• Milk — 8g per 250ml, good for smoothies

Practical Strategies When Appetite Is Low

Knowing you need 120g of protein is one thing. Actually eating it when food is unappealing is another. Here are strategies that work:

Protein first, always. At every meal, eat your protein source before anything else. If you can only manage half the plate, at least your protein is covered.

Liquid protein counts. Protein shakes, smoothies, and even bone broth are easier to consume when solid food is unappetising. A simple shake with whey, milk, and banana delivers 35-40g of protein with minimal effort.

Divide and conquer. Four 30g-protein meals are more achievable than three 40g-protein meals. Add a protein-rich snack mid-morning or before bed.

Prep for low days. Keep ready-to-drink protein shakes, pre-cooked chicken, boiled eggs, and Greek yoghurt stocked at all times. On bad appetite days, these require zero preparation and zero motivation.

Enhance your existing meals. Simple additions that don't increase food volume much: add egg whites to scrambled eggs (+7g per 2 whites), stir protein powder into yoghurt (+25g), mix collagen into coffee (+10g), and add cottage cheese to… almost anything (+11g per 100g).

Timing Your Protein

While total daily intake matters most, distribution throughout the day optimises muscle preservation:

Spread it out. 30-40g of protein per meal maximises muscle protein synthesis. Eating 80g in one sitting is less effective than 4 meals of 30g each.

Don't skip breakfast protein. After an overnight fast, your body is in a catabolic state. A protein-rich breakfast — even just a shake or Greek yoghurt — signals muscle preservation.

Post-workout priority. If you're doing resistance training, consume 25-40g of protein within 2 hours of your session. This is the most anabolic window of your day.

Before bed. A slow-digesting protein source (cottage cheese, casein shake) before sleep supports overnight muscle repair.

When Supplements Make Sense

Whole food should always be your primary protein source. But supplements become practical — not optional — when your total calorie intake is consistently below 1,500 calories, you're falling more than 20g short of your daily target through food alone, nausea or food aversion makes solid protein sources intolerable, or convenience is the difference between hitting your target and missing it.

Whey protein isolate is the gold standard: highest bioavailability, fastest absorption, and the most leucine per gram — the amino acid most responsible for triggering muscle protein synthesis.