Nutrition After Knee Replacement - Thrive Protocol
                     SURGERY RECOVERY GUIDE
Nutrition After Knee 
Replacement
How to protect your quadriceps, support healing and plan 
your meals from one week before surgery to six weeks 
after
Medically reviewed content · mythriveprotocol.com/pages/knee-replacement-nutrition
Why nutrition after knee replacement matters
Surgery asks a lot of your body at the moment your appetite is lowest
Your body is working Your quadriceps takes Nutrition supports your 
overtime the hit defences
Major surgery triggers The front thigh muscle straightens Like any joint replacement, knee 
inflammation, higher energy and stabilises the knee. It can replacement carries a small 
demands and tissue repair all at weaken and shrink quickly after infection risk. Nutritional status is 
once. surgery, and rebuilding it is the core one factor in how well the body 
of rehab. defends itself.
Good nutrition supports your rehab. Physical therapy does the rebuilding.
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What the research shows
Results from studies of knee replacement patients
8.5% vs 13.4% ~36% 2.6×
Quadriceps volume lost with Quadriceps strength lost at 2 weeks Higher odds of surgical site infection 
essential amino acids vs placebo, in the control group; the HMB, in malnourished patients (an 
taken 1 week before to 6 weeks arginine and glutamine group kept association, not proof of cause)
after surgery its strength
Dreyer et al., JBJS Open Access, 2018 (RCT, n=39) Nishizaki et al., Asia Pac J Clin Nutr, 2015 (n=23) Chen & Chen, J Orthop Surg Res, 2024 (meta-
analysis, 9 studies)
The honest picture: supplements limited muscle loss, but strength and function tests were similar at 6 weeks, and two-year clinical scores 
did not differ (Ueyama et al., JBJS, 2023).
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Key nutrients after knee replacement
What each one does, and how strong the evidence is
Protein and essential 
Vitamin C Vitamin D
amino acids
The raw material for muscle and tissue. Needed to make collagen. Knee Deficiency is linked to poorer outcomes 
Leucine is the amino acid most linked to replacement trials found less stiffness and and longer stays (review of about 150,000 
muscle maintenance. lower CRPS rates, with mixed significance. knee replacements). Ask for a level check.
Creatine (optional, 
Collagen Fiber and fluids
later)
Promising but early evidence for tendon Pain medicine slows the gut. Fruit, Helps strength with training in older 
and tissue support. Not yet studied in vegetables, oats and plenty of water help adults, but the one small knee 
knee replacement itself. prevent constipation. replacement trial showed no benefit at 30 
days.
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How much protein do you need?
Spread it across the day: about four meals and snacks
1.5 g per kg Body weight Daily target Per meal (4 a day)
of ideal body weight a day is the estimate from European 
surgical nutrition guidelines (ESPEN). 60 kg (132 lb) 72–90 g 18–23 g
For adults over 65 recovering from illness, the PROT-AGE 
expert group recommends 1.2 to 1.5 g/kg a day.
80 kg (176 lb) 96–120 g 24–30 g
100 kg (220 lb) 120–150 g 30–38 g
Easy protein foods
Based on 1.2 to 1.5 g per kg a day. If you have kidney disease or have been told to limit 
Eggs, Greek yogurt, cottage cheese, milk, chicken, fish, tofu protein, ask your doctor for your own target first.
and lentils. A protein shake counts when appetite is low.
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Your nutrition plan, phase by phase
From planning ahead to rebuilding strength
1 2 3 4 5 6 7
2–3 weeks 1 week before Night before Surgery day Week 1 at Weeks 2–6 After 6 weeks
before home
Show your surgeon Build the habit: Ask whether a Your surgical team Appetite is low and Keep protein Keep protein up 
any supplement protein at every carbohydrate drink decides pain the quad is under steady alongside while you build 
you plan to take. meal, plus a daily is allowed instead control, fluids and most pressure. A physical therapy, strength in rehab.
Ask about a shake between of fasting from eating. sippable shake every day.
vitamin D test. meals if needed. midnight. counts as a meal.
Tip: check every step with your surgical team. Their fasting rules and instructions come first.
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What to eat: a simple recovery plate
Food first. Supplements fill gaps, they don't replace meals
Protein at every meal Vitamin C foods
Eggs, Greek yogurt, cottage Oranges, kiwi, strawberries, 
cheese, chicken, fish, tofu, bell peppers, broccoli
lentils
Vitamin D and calcium Fiber and fluids
Oily fish, eggs, fortified milk Oats, berries, prunes, 
and yogurt vegetables and plenty of water
Limit: alcohol (especially with pain medicine), skipped meals, and cutting 
calories while your body is still repairing tissue.
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Safety first: talk to your surgical team
Tell your care team about every supplement you take, with doses
Blood thinners Diabetes
Mention every supplement, including fish oil and A pre-op carbohydrate drink was safe in a trial of type 
turmeric, so your surgeon can tell you what to pause. 2 diabetes. If you use insulin, get your physician's 
approval first.
Kidney disease Milk allergy
Get your doctor's approval before protein shakes or Whey-based protein shakes contain milk. Choose 
creatine, especially if you've been told to limit protein. another protein source if you don't tolerate whey.
Your surgeon's instructions and fasting rules always come first.
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Frequently asked questions
Nutrition after knee replacement, answered
When should I start? Why do my legs feel so weak?
About 1 week before surgery, and keep protein steady The quadriceps weakens quickly after surgery. Nutrition 
through the first 6 weeks of rehab. limited muscle loss in trials, but physical therapy 
rebuilds strength.
Does nutrition replace my surgeon's 
Is it too late if my surgery is done?
plan?
No. Start protein-focused nutrition as soon as you are No. It supports it. Always follow your surgical team's 
eating again. instructions.
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READ THE FULL GUIDE
Nutrition After Knee Replacement: 
Prepare, Heal and Recover Stronger
The complete phase-by-phase plan, every study cited, and answers to common 
questions. Medically reviewed by Dr. Patrick Denard, orthopaedic surgeon, 
October 2026.
mythriveprotocol.com/pages/knee-replacement-nutrition
Educational information, not medical advice. These statements have not been evaluated by the Food and Drug Administration. 
Thrive Protocol products are not intended to diagnose, treat, cure, or prevent any disease.