How Much Protein Do You Need After an Achilles Rupture?
Protein after an Achilles rupture isn't optional — it's the foundation of your recovery. Here's exactly how much you need, why it matters, and how to hit your target when you're stuck on the couch.
When I ruptured my left Achilles playing AFL, protein was honestly the last thing on my mind. I was focused on the surgery, getting around on crutches, and trying not to spiral about how long I'd be off the field.
But once the dust settled, the nutrition question that came up again and again — in my own head, and from every athlete I've worked with since — was this:
How much protein do I actually need right now?
It sounds simple. It's not. Here's what the evidence says, and what I personally did.
Why Protein Matters More Than Ever When You're Injured
Here's the cruel irony of an Achilles rupture: the time when you're least able to be active is the exact time your body has the highest demand for protein.
After surgery, your body enters an intensive repair state. It needs amino acids — the building blocks from dietary protein — to:
Rebuild tendon tissue at the surgical repair site
Maintain calf and lower leg muscle mass while you're immobilised
Support immune function and wound healing in the weeks post-surgery
Without adequate protein, your body breaks down muscle tissue to fund these processes. And once you lose calf muscle, you'll spend months rebuilding it in rehab — making your overall recovery longer and harder than it needed to be.
KEY POINT
Muscle loss during immobilisation after an Achilles rupture is one of the most significant factors affecting long-term recovery outcomes. Adequate protein intake is one of the most powerful tools you have to slow that process down — and most injured athletes are not eating enough of it.
The Numbers: How Much Protein Do You Actually Need?
General population guidelines suggest around 0.8g of protein per kg of body weight per day. For someone recovering from a significant tendon injury and surgery? That's nowhere near enough.
Current sports medicine and rehabilitation nutrition evidence points to:
Between 2–2.5g per kg of body weight per day during the acute phase and immobilisation
Spread across 4–5 eating occasions, not loaded into one or two big meals
With at least 30–40g of protein per meal and eating occasion to maximally stimulate muscle protein synthesis (creation of new muscle and tissue!)
So for a 70kg person, that's roughly 140–175g of protein per day.
That's a meaningful target — and most people are well under it, especially in the early weeks when appetite is disrupted, mobility is limited, and making anything more than toast feels like an Olympic event.
What I Did During My Own Recovery
I'll be honest: my instinct was to eat less. I was immobile, off my feet, watching my calf muscle visibly shrink inside the boot. It didn't feel right to eat like an athlete when I couldn't train like one.
That instinct was wrong.
What I know now — both from the evidence and from living it — is that this is not the time to under-fuel. Your body is running a construction project around the clock. It needs materials to work with.
I prioritised protein at every single meal: Greek yoghurt and eggs in the morning, a quality protein source at both lunch and dinner, and a casein-rich snack before bed to support overnight tissue repair. I aimed for close to 2g per kg of bodyweight and stayed consistent with it throughout the immobilisation phase.
Did I put on a small amount of weight? Yes. But I retained more muscle than I expected, and my physio commented that my calf strength coming out of the boot was better than average for where I was in the timeline. Could I attribute that entirely to protein? Not definitively. But I genuinely believe it made a difference.
The Best Protein Sources for Achilles Recovery
Not all protein sources are equal when you're recovering from a tendon injury. Prioritise foods that are:
HIGH IN LEUCINE
The amino acid most responsible for triggering muscle protein synthesis. Found in chicken, eggs, dairy, and whey protein.
RICH IN GLYCINE & PROLINE
The amino acids your body uses specifically to build collagen — the structural material of tendons. Found in bone broth, skin-on chicken, and gelatin-based foods.
Easy-to-prepare options — because you're on crutches and spending a lot of time with your leg elevated:
Greek yoghurt
Cottage cheese
Tinned fish — salmon, tuna, sardines
Hard-boiled eggs (batch cook for the week)
Protein shakes made with milk
Rotisserie chicken (zero prep required)
Practical Tips to Hit Your Target
1. Start at breakfast. Don't leave protein catch-up for dinner. A 40g protein breakfast sets the foundation for the whole day.
2. Keep snacks within arm's reach. When you're on crutches, a high-protein snack needs to be something you can access from the couch. Greek yoghurt, cottage cheese, and boiled eggs all work.
3. Track for one week. Most injured athletes are genuinely shocked how far off their target they are when they actually look at the numbers. You don't need to track forever — just one week to calibrate.
4. Don't avoid protein supplements. A well-timed whey shake or casein pudding is not a shortcut — it's a practical tool for a period in your life when cooking is genuinely hard.
RECOVERY RULE
The weeks immediately after Achilles surgery are not the time to diet or restrict. Your body has a massive physiological job to do. Eating to fuel that process — even when you're sedentary and anxious about weight gain — is one of the most important things you can do for your long-term outcome.
The Bottom Line
After an Achilles rupture, your protein requirements go up — not down. Aim for 1.6–2.2g per kg of body weight per day, spread across 4–5 eating occasions, with at least 30–40g per meal.
It won't feel intuitive to eat this way when you're sedentary and worried about your weight. But fuelling your recovery properly is one of the highest-leverage things you can do to protect your muscle, support your tendon repair, and get back on the field sooner.
Want the complete nutrition roadmap for Achilles rupture recovery?
The FREE Nutrition for Achilles Rupture ebook covers every phase of your recovery — from surgery through return to sport — including protein targets, collagen protocols, supplement guides, and meal ideas built around the reality of being on crutches.
Download your free copy → spicenutrition.com.au/achilles-ebook
About the Author: Bella Rennick
Bella is an Accredited Sports Dietitian and AFL player who ruptured her left Achilles and returned to full sport after 10 months. She specialises in injury recovery nutrition and works with athletes at all levels. Learn more at spicenutrition.com.au/about