Fuelling Your Recovery:
Perioperative Nutrition
for Knee Surgery
What you eat before and after your operation is one of the most powerful tools you have to speed your recovery, reduce complications, and return to the life and activities you love.
My goal is to provide truly holistic care-optimising every aspect of your health before surgery so that you are in the best possible condition to heal, recover, and ultimately return to your peak performance.
— Associate Professor Chinmay Gupte, Consultant Orthopaedic SurgeonWhy Nutrition Changes Knee Surgery Outcomes
Surgery places your body under significant physiological stress. This triggers inflammation, increases your nutritional demands, and if your reserves are low, can impair wound healing, weaken your immune defences, and slow your return to function. The good news is that this is highly modifiable. Targeted nutritional preparation before and after surgery is one of the most evidence-supported ways to improve your outcome.
Research consistently shows that patients who are nutritionally optimised before elective orthopaedic surgery experience fewer wound infections, shorter hospital stays, less post-operative pain, and faster return to their activities.
Your Perioperative Nutrition Journey
Nutritional optimisation is not something you start the day before surgery. The timeline below outlines the key actions at each stage of your surgical journey.
Screen & Identify Deficiencies
Blood tests to check your vitamin D, albumin (protein store), zinc, and other key markers. If deficiencies are found, there is time to correct them before surgery — which can meaningfully reduce your complication risk.
Begin Active Supplementation
Start targeted supplementation based on your blood results. Begin essential amino acids (EAAs) to prime your muscles for the stress of surgery. Shift your diet toward high-quality protein, colourful vegetables, and anti-inflammatory foods.
Fine-Tune & Prepare
Confirm vitamin D levels are corrected. Add vitamin C for its anti-inflammatory and collagen-supporting properties. Reduce sugar, processed foods, and alcohol to lower pre-operative inflammation.
Carbohydrate Loading
The evening before surgery, drink approximately 800 mL of a carbohydrate-loading drink. This is safe, evidence-based, and significantly reduces the insulin resistance and muscle breakdown triggered by surgical stress. Always follow your surgical team's fasting instructions.
Accelerate Recovery
Continue essential amino acids for at least 2 weeks post-operatively (ideally 4–8 weeks). If you have had knee surgery with swelling, MPFF (a natural bioflavonoid, e.g. Daflon) has strong trial evidence for reducing swelling and improving early movement. Prioritise protein at every meal.
Building Your Recovery Plate
Every meal is an opportunity to support your healing. Think of your plate as your daily investment in a faster, smoother recovery. The principles are straightforward: prioritise protein, maximise anti-inflammatory foods, and minimise anything that spikes your blood sugar.
The Recovery Plate
A visual guide to your ideal perioperative meal
Daily Protein Guide — How Foods Compare
Target: 1.6–2.0 g of protein per kg bodyweight per day perioperatively. A 75 kg person needs approximately 120–150 g total daily, regardless of dietary choices.4
Not All Protein Is Equal - Understanding the DIAAS Score
When we talk about protein intake before and after surgery, the number of grams matters - but it is only part of the picture. The question that often gets overlooked is how much of that protein your body can actually absorb and use. Two foods may both contain 20g of protein per serving, but one may deliver twice the muscle-building benefit of the other.
This is where the DIAAS score comes in. DIAAS stands for Digestible Indispensable Amino Acid Score, and it is the most accurate system currently available for measuring protein quality. Recommended by the Food and Agriculture Organization of the United Nations, it tells you not just how much protein a food contains, but how completely and efficiently your body can absorb and use the essential amino acids within it.
How the DIAAS score works
Your body needs nine essential amino acids that it cannot make on its own. DIAAS measures how well a food supplies each of these, accounting for how much is actually absorbed through the small intestine rather than simply passing through.
The score is set against a human reference standard. A score of 100 or above means the food meets or exceeds the body's requirements for every essential amino acid. A score below 100 means at least one amino acid falls short, limiting how much of the rest your body can put to work.
DIAAS Scores for Common Protein Sources
The table below shows how protein quality varies significantly between foods with similar gram counts. Animal proteins consistently score highest, though well-chosen plant combinations can also provide excellent quality protein and meet your daily needs.
| Food | DIAAS Score | Quality Rating | Practical Note |
|---|---|---|---|
| Whole egg (boiled) | 112 | Excellent | One of the most bioavailable proteins available |
| Beef (lean) | 109 | Excellent | Also high in zinc, important for wound healing |
| Chicken breast | 108 | Excellent | Lean, practical, versatile recovery staple |
| Whey protein concentrate | 107 | Excellent | High leucine content - particularly useful for muscle synthesis |
| Milk / Greek yoghurt | 105 | Excellent | Casein component digests slowly, sustaining amino acid supply |
| Fish (salmon, cod, tilapia) | 100 | Excellent | Oily fish also provides anti-inflammatory omega-3s |
| Soya flour / soy protein | 89 | Good | Best plant-based solo option; soy isolate scores similarly |
| Peas / pea protein | 65 | Incomplete alone | Combine with rice or egg to complete amino acid profile |
| Cooked rice | 60 | Incomplete alone | Pairs well with legumes - each fills the other's amino acid gaps |
| Lentils / kidney beans | 59 | Incomplete alone | Valuable alongside animal protein or rice for complementation |
| Wheat / bread | 45 | Incomplete alone | Low lysine content limits usability as a protein source |
What this means for your recovery
Around surgery, your body's demand for essential amino acids is significantly higher than normal. Choosing protein sources with a DIAAS of 100 or above - eggs, chicken, fish, dairy, beef - means more of what you eat is converted into muscle repair and tissue healing rather than being lost. If you follow a plant-based diet, combining sources such as rice with lentils, or pea protein with soy, creates a complementary amino acid profile that significantly raises overall quality. This is why the target is not simply a gram count but a gram count from the right sources.
DIAAS values sourced from: FAO (2013) Dietary Protein Quality Evaluation in Human Nutrition; Herreman et al. Food Science & Nutrition 2020; Mathai et al. British Journal of Nutrition 2017. Scores shown are for adults using the FAO reference pattern for persons over 3 years of age.
Foods & Habits That Impair Recovery
Just as important as what you eat is what you limit. The items below promote inflammation, impair wound healing, or interfere with your body's ability to recover from the stress of surgery.
A note on GLP-1 medications (Ozempic, Wegovy, Mounjaro)
If you are taking a GLP-1 receptor agonist for weight management or diabetes, please inform your surgical team well in advance. These medications require specific perioperative management — including considerations around aspiration risk and monitoring for muscle and bone mass loss. It is important that any rapid weight loss is accompanied by adequate protein intake. Your team will advise on timing around your surgery date.
Nutritional Screening Blood Tests
Before embarking on supplementation, it is important to know your baseline. The following tests allow us to identify specific deficiencies and tailor your nutritional plan — rather than guessing. These are typically arranged at your pre-operative assessment appointment.
| Test | What It Tells Us | Action Threshold | Why It Matters |
|---|---|---|---|
| Vitamin D (25-OH) | Body vitamin D stores | < 30 ng/mL or 50nmol/L → replete | Infection, pain, bone healing |
| Albumin | Protein nutritional status | < 35 g/L → nutritional support | Wound healing, immune function |
| Pre-albumin | Recent protein status (acute) | < 15 mg/dL → dietary review | More sensitive than albumin |
| Zinc | Immune & wound healing mineral | < 95 µg/dL → supplement | Wound complications, infection |
| Full Blood Count | Anaemia, white cell health | Hb < 120 g/L → investigate | Anaemia increases surgical risk |
| HbA1c / Fasting glucose | Blood sugar control | HbA1c > 39 mmol/mol → optimise | Infection, healing, anaesthetic risk |
| Ferritin | Iron storage protein | 40-400ug/L |
Please note that these are indicative numbers and lab reference ranges vary. Fasting Insulin (optimal range 2-10umol/L) is also a marker of metabolic health. If you have concerns about your nutritional status, please raise them with our team early so there is sufficient time to correct any deficiencies before your operation date.
Your Surgical Journey as a Whole
Associate Professor Chinmay Gupte and his team at Imperial College London / Charing Cross Hospital and the Wellington Hospital approach every patient as an individual. Surgery is one component of your journey-but preparation, rehabilitation, and optimisation of all modifiable factors are equally important in determining your ultimate outcome.
Nutritional optimisation sits within a broader prehabilitation framework that also includes physiotherapy, cardiovascular fitness, psychological readiness, and management of underlying medical conditions. The goal is not simply to get you through surgery safely-it is to return you to your peak physical performance and the activities that matter most to you.
References
- Dubé MD, Rothfusz CA, Emara AK, et al. Nutritional Assessment and Interventions in Elective Hip and Knee Arthroplasty. Curr Rev Musculoskelet Med. 2022;15:311.
- Emara AK, Nageeb E, George J, et al. Hypovitaminosis D in lower extremity Joint Arthroplasty: A systematic review and meta-analysis. J Orthop. 2020;21:109.
- Ueyama H, Kanemoto N, Minoda Y, et al. Perioperative Essential Amino Acid Supplementation Facilitates Quadriceps Muscle Strength and Volume Recovery after TKA. J Bone Joint Surg. 2023;105:345–53.
- Khani Y, Salmani A, Elahi M, et al. Peri-operative protein or amino acid supplementation for total joint arthroplasty: a systematic review and meta-analysis. J Orthop Surg Res. 2025;20.
- Siddiqi A, Yousuf KM, Chen AF, Jacobs P, Wickline A. Perioperative Nutritional Optimization in Total Joint Arthroplasty: From Screening to Supplementation. J Arthroplasty. 2026.
- Birinci M, Hakyemez ÖS, et al. Effect of Vitamin D Deficiency on Periprosthetic Joint Infection and Complications After Primary Total Joint Arthroplasty. J Arthroplasty. 2024;39:S151–7.
- Ramón R, Holguín E, et al. Anti-Inflammatory Effect of Vitamin C during the Postoperative Period in Patients Subjected to Total Knee Arthroplasty. J Pers Med. 2023;13:1299.
- Aïm F, Klouche S, et al. Efficacy of vitamin C in preventing complex regional pain syndrome after wrist fracture: A systematic review and meta-analysis. Orthop Traumatol Surg Res. 2017;103:465–70.
- Wang Q, Li F, Yang Y, et al. Magnesium sulfate enhances the effect of the peripheral analgesic cocktail in total knee arthroplasty. EFORT Open Rev. 2024;9:896–907.
- Uwitonze AM, Razzaque MS. Role of magnesium in vitamin D activation and function. J Am Osteopath Assoc. 2018;118:181–9.
- Wang Q, Jin Q, Cai L, et al. Efficacy of Diosmin in Reducing Lower-Extremity Swelling and Pain After Total Knee Arthroplasty. J Bone Joint Surg. 2024;106:492–500.
- Girgin AB, Duman E. Is a Combination of Diosmin and Hesperidin Effective on Swelling, Pain, and Range of Motion after Total Knee Arthroplasty? J Arthroplasty. 2025.
- Zorrilla P, Gómez LA, et al. Low serum zinc level as a predictive factor of delayed wound healing in total hip replacement. Wound Repair Regen. 2006;14:119–22.
- Vivek K, Kamal R, Perera E, Gupte CM. Vitamin D Deficiency Leads to Poorer Health Outcomes and Greater Length of Stay After Total Knee Arthroplasty. JBJS Rev. 2024;12:e23.00150.
- Lai Y, Cai Y, Ding Z, et al. Effect of Preoperative Carbohydrate Loading on Postoperative Recovery After Total Knee Arthroplasty. J Arthroplasty. 2025;40:665–71.
- Phillips JLH, Ennis HE, Jennings JM, Dennis DA. Screening and Management of Malnutrition in Total Joint Arthroplasty. J Am Acad Orthop Surg. 2023;31:319–25.
- Hagiyama A, Yamamoto N, et al. Efficacy of Protein and Essential Amino Acid Supplementation in Lower Limb Surgeries: A Systematic Review and Meta-Analysis. Cureus. 2024;16:e69212.
- Weimann A, Braga M, Carli F, et al. ESPEN guideline: Clinical nutrition in surgery. Clin Nutr. 2017;36:623–50.
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