PATIENT EDUCATION

What the Research Says About Recovery Nutrition

Nouraide Education Series

Why the body's requirements change after surgery and what the published studies actually show.

Most people leaving hospital after an orthopaedic procedure are given clear instructions about their wound, their medications, their weight-bearing status and their physio appointments. What they're rarely given is guidance on what to eat.

That's not a criticism of surgical teams. Discharge is busy, time is short, and nutrition sits outside most surgical scopes of practice. But it does leave a gap, because the research on what the body needs during recovery is neither new nor unclear.

Requirements go up, not down

After surgery, protein requirements increase substantially. ESPEN and ERAS guidance places the post-operative target at roughly 1.5–2.0 g/kg of body weight per day, against a general adult reference intake of around 0.8 g/kg/day.

For an 80 kg person, that's a jump from about 64 g of protein a day to somewhere between 120 g and 160 g.

That's a meaningful amount of food and it arrives at exactly the moment most people feel least like eating.

Nutritional status is associated with outcomes

This isn't only about comfort. A retrospective cohort study of patients undergoing surgery for distal radius fractures found that low serum albumin, used as a marker for malnutrition, was a predictor of post-operative complications (Wilson et al., J Hand Surg Am, 2019).

Malnutrition in surgical populations is also more common than most people expect. A review of 44 studies covering 26,281 older adults with hip fracture found prevalence of approximately 18.7% using the Mini-Nutritional Assessment, rising to 45.7% when other criteria such as BMI, weight loss or albumin concentration were used (Malafarina et al., Nutrients, 2018).

Muscle is lost quickly, and rebuilt slowly

Reduced mechanical loading after orthopaedic surgery predisposes patients to muscle atrophy, and that loss has consequences for rehabilitation, strength and independence.

A systematic review of randomised controlled trials examined whether protein or amino acid intake affects post-operative muscle atrophy and patient outcomes following orthopaedic surgery (George et al., Sports Med Health Sci, 2024). It's a useful starting point if you want to read the primary literature yourself. The included trials cover ACL reconstruction, hip and knee arthroplasty, and hip fracture surgery.

Why this is hard in practice

Knowing the target and hitting it are different problems.

Appetite is often reduced after surgery. Anaesthetic, pain medication, disrupted sleep and reduced activity all suppress it. Cooking is harder when you're on crutches or in a sling. And 120 g of protein a day is a lot of food to get through when you're not especially hungry.

A few things that tend to help:

• Spread protein across the day rather than relying on one large evening meal.
• Prepare before your operation, while you're still mobile; frozen portions, easy-to-assemble meals.
• Don't ignore fibre and fluid. Reduced movement and pain medication commonly affect bowel function.
• Eat something regularly even when appetite is low. Smaller, more frequent intake is usually more achievable than three full meals.

Questions worth asking your healthcare team

Nutrition after surgery isn't one-size-fits-all, and some conditions and medications change the picture considerably. Worth raising at your pre-op or discharge appointment:

• Is there a protein target appropriate for me specifically?
• Do any of my medications or conditions affect what I should be eating?
• Are there foods or supplements I should avoid around my procedure?
• Should I be referred to a dietitian?

If you have kidney or liver conditions, diabetes, or take medicines affecting bleeding or clotting, these conversations matter more, not less.

Free education, always

Our recovery nutrition guides are open to everyone at nouraide.com. No purchase, no subscription, no account. We think anyone recovering from surgery should be able to understand the nutrition behind it.

For healthcare professionals: we maintain a clinical reference guide covering the published literature in this area in more detail, including full citations. Email contact@nouraide.com if you'd like a copy.

This article is general information only and is not medical advice. It is not intended to diagnose, treat, cure or prevent any disease. Nutritional requirements vary considerably between individuals. Always follow the specific guidance of your surgeon or healthcare team, and consult them before making changes to your diet or nutritional intake around surgery.