Short answer: After meniscus surgery or knee arthroscopy, aim for about 1.5 grams of protein per kilogram of body weight a day. For a 150 lb person that's roughly 100 grams, split over four meals. Cut the extra calories you'd normally eat for training, not the protein. A protein shake can fill the gap when food falls short. A trim usually means a few weeks of eating this way. A repair can mean months.

Written by the Thrive Protocol editorial team. Updated October 2026.
Medically reviewed by Dr. Patrick Denard, orthopaedic surgeon, on October 8, 2026

This guide is for arthroscopic meniscus surgery: a partial meniscectomy, where the torn piece is trimmed away, or a meniscus repair, where it's stitched back together. If your meniscus was fixed during an ACL reconstruction, your rehab will follow the ACL timeline your surgeon sets, so start with our guide on what to eat after ACL surgery. Getting a total knee replacement instead? See what to eat after knee replacement surgery and our graded review of supplements after knee replacement. For any other operation, start with our main guide to what to eat after surgery.

Trim or repair? Why it changes how you eat

The two common meniscus operations lead to very different recoveries.

  • Partial meniscectomy (trim). People usually get back to normal function within weeks [1]. In a 2026 meta-analysis of athletes, the average return to sport was 2.1 months [3].
  • Meniscus repair (stitch). Protocols vary a lot. Some surgeons allow weight bearing as tolerated early on, while others keep you off the leg in a brace for up to 6 weeks [2]. The same meta-analysis found an average return to sport of 5.8 months after repair [3].

A trim means a few weeks of protecting your thigh muscle. A repair means a longer low-activity stretch, then months of rebuilding, so your eating habits have to last. The plan below splits the two.

Your quad is the real target while you're on crutches

Your meniscus doesn't need a special diet. Your thigh muscle does. When the leg isn't loaded, the quadriceps shrinks fast, and the weakness can outlast the surgery. A systematic review of partial meniscectomy patients found large quad strength deficits in the operated leg during the first month, with smaller deficits still showing at 3 to 6 months [1].

Here's the honest part: protein alone can't stop that early loss. In a randomized trial, 33 healthy young men had one leg immobilized for 3 days while eating high, low or almost no protein. Quad volume dropped 2.0 to 2.7% in every group, with no real difference between them [4]. The quad sets, leg raises and other exercises your physical therapist hands you in week one matter as much as your plate. Protein earns its keep once you start loading the leg again and your muscle has a reason to rebuild.

Omega-3s: interesting, not settled

One study points to omega-3 fats. Twenty healthy young women took either 5 grams a day of omega-3s or sunflower oil for 4 weeks, then had one leg immobilized for 2 weeks. Muscle volume fell 8% in the omega-3 group and 14% in the control group [5]. That's a small study in people who didn't have surgery, and 5 grams a day is a high dose. Start with food: salmon, sardines or trout a couple of times a week.

How much protein after meniscus surgery?

The European surgical nutrition guideline (ESPEN) estimates protein needs at about 1.5 grams per kilogram of ideal body weight a day for surgical patients [6]. For a 150 lb (68 kg) patient:

  • 68 kg x 1.5 g = 102 g of protein a day
  • 102 g over 4 meals = about 25 g per meal

If your surgeon or a dietitian gives you a different number, go with theirs. Teens, people with kidney disease and anyone on a medical diet should check before raising protein.

Easy protein that needs no chopping: Greek yogurt, cottage cheese, eggs, milk or soy milk, rotisserie chicken, canned tuna or salmon, sliced turkey, tofu, edamame and ready-to-drink protein shakes.

Where a protein shake fits

A shake is a backup, not a requirement. If you already get about 25 g at most meals from food, you don't need one. It earns its place in the first days after surgery, when cooking on crutches is a chore and a full plate can feel like too much. When you compare protein powders or ready-to-drink shakes, look for:

  • About 25 g of protein per serving, so one shake covers one of your four meals.
  • Third-party testing, such as Informed Sport, which screens every batch for banned substances.
  • A texture you'll actually drink every day. A thin shake you can sip through a straw is easier on the couch or when your stomach is unsettled.

Whey is a milk protein, so skip it if you have a milk allergy. Teens, people with kidney disease and anyone on a medical diet should check before adding a shake, the same as with any increase in protein.

Your calorie needs drop on crutches. Eat for that.

If you run, lift or play a sport, your normal portions are built for training. On crutches you burn less, so eating the same way puts you in a surplus. That isn't harmless. In a bed rest study of 19 healthy men, the ones who gained more fat over 5 weeks of inactivity also lost more lean mass, about 3.8 kg versus 2.3 kg [7]. That was bed rest, not surgery, but it's a good reason not to eat like you're still training.

ESPEN uses 25 to 30 calories per kilogram a day as a rough estimate for surgical patients [6]. For the same 68 kg person, that works out to 68 x 25 = 1,700 up to 68 x 30 = 2,040 calories. Treat it as a starting point, not a prescription.

The rule of thumb: cut the extras, keep the protein. Drop the sports drinks, the second helping of pasta and the nightly dessert first. Don't skip meals or crash diet, because that makes your protein target almost impossible to hit. When hard rehab sessions start, eat more again.

Eating plan by phase: meniscectomy vs. meniscus repair

Time after surgery After a trim (meniscectomy) After a repair Eating focus
Days 1 to 3 Swelling, home exercises begin Brace and crutches, weight bearing as your surgeon allows Bland, easy meals if anesthesia upset your stomach. Sip fluids. Some protein at each meal, even small portions.
Weeks 1 to 2 Walking more, easing back into daily life Protected weight bearing and limited bending in many protocols About 25 g protein x 4. Trim: normal meals minus training extras. Repair: portions toward the lower calorie estimate.
Weeks 2 to 6 Strength work building Often still protected, up to 6 weeks in some protocols [2] Keep protein steady. For repairs this is the longest low-activity stretch, so keep meals simple and portions moderate.
Weeks 6 to 12 Many athletes near return to sport, about 2 months on average [3] More loading and strength work as cleared Add carbs back around harder sessions. If you use collagen with vitamin C, timing it before rehab makes the most sense now.
Months 3 to 6 Back to normal training for most Running and agility work; average return to sport about 6 months [3] Eat like you're training again: protein spread through the day, carbs for workouts, steady fluids.

Typical patterns only. A systematic review found no agreement on the best rehab protocol after meniscus repair [2], so your surgeon's plan wins every time.

What to expect: what happens after you start

Here's how the weeks usually unfold and what eating well looks like in each one. The milestones come from the studies cited on this page. Your surgeon's plan comes first, and your recovery may be faster or slower.

About 1 week before surgery

  • Start eating to your target now, about 25 g of protein at each of four meals. The habit is easier to build before you're on crutches.
  • Cook ahead and set up the kitchen (see the crutch tips below).
  • Ask your surgeon which supplements to stop and when. Anesthesia groups advise stopping herbal products 1 to 2 weeks before elective surgery [12].
  • If you're using a Thrive kit, this is when to start it: one OptiFuel packet a day, about 1 week before surgery.

The night before

Follow your surgical team's fasting rules exactly. If you have the Surgical Protocol Kit and your team approves, mix each of the 2 OptiCharge packets with 12 to 16 oz of water and drink both at bedtime. If you use insulin, get your doctor's okay first. Our guide to what to eat the night before surgery covers dinner and timing.

Days 1 to 3

Swelling is expected and home exercises usually begin. If anesthesia upset your stomach, keep meals bland and easy, sip fluids, and get some protein at each meal, even in small portions.

Weeks 1 to 2

Expect your thigh to feel weak. Large quad strength deficits in the operated leg are common in the first month after a partial meniscectomy [1], and protein alone can't stop that early loss [4]. Do the quad sets and leg raises your physical therapist gives you, and keep protein at about 25 g x 4. After a repair you'll likely still be protecting the leg, so aim your portions toward the lower calorie estimate.

Weeks 2 to 6

After a trim, strength work builds and daily life gets back to normal. After a repair, some protocols keep the leg protected for up to 6 weeks [2]. That's the longest low-activity stretch, so keep meals simple, protein steady and portions moderate.

Week 6 and beyond

Athletes returned to sport about 2.1 months after a trim and about 5.8 months after a repair, on average [3]. Smaller strength deficits can still show at 3 to 6 months [1], so keep protein spread through the day for as long as you're in rehab, and add carbs back around harder sessions.

What using a kit looks like day to day

  • One packet a day. Shake one OptiFuel packet with 12 to 16 oz of water, milk or non-dairy milk and drink it between meals. It's thin enough to sip through a straw.
  • Restart after surgery once you're eating again, and keep going through rehab.
  • Taking the Recovery and Strength Mix too? Thrive suggests OptiFuel between breakfast and lunch and the Mix between lunch and dinner.
  • Bored of plain shakes? Our quick OptiFuel recipes turn a packet into a smoothie, pudding or yogurt bowl.

What you won't notice: a protein supplement doesn't feel like anything. One packet covers about a quarter of a 100 g day, so the honest test is whether you hit your protein target most days. Protein alone can't stop early muscle loss [4], so your rehab exercises matter as much as your plate.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Collagen and vitamin C before rehab: what the studies do and don't show

What the studies show. In a small crossover study, 8 healthy men took 15 g of vitamin C-enriched gelatin (a form of collagen) an hour before 6 minutes of jumping rope. A blood marker of collagen production doubled compared with placebo [8]. A follow-up in 10 active men tested gelatin and hydrolyzed collagen the same way. The marker rose about 20%, but results varied so much that the difference wasn't statistically significant [9].

What they don't show. Those studies measured blood markers in healthy men, not healing after surgery, and the research mostly concerns tendons and ligaments. The meniscus isn't either of those. A 2025 systematic review of collagen treatments for meniscus tears covered 27 studies. Most involved collagen implants placed during surgery, and the oral collagen studies looked at knee symptoms rather than repair healing. The authors called for better trials [10]. We couldn't find a single trial showing that collagen you drink helps a meniscus repair hold up.

If you want to try it anyway, ask your surgeon first. The pattern that's been studied is about 15 g of gelatin or collagen with a vitamin C source roughly an hour before a loading session [8, 9]. Kiwi, an orange or a handful of strawberries works. After a repair, real loading may be weeks away, so early on your total protein and calories matter far more than collagen timing.

Cooking on crutches: kitchen tips for non-weight-bearing weeks

This is where meniscus repair patients struggle most. Both hands are on crutches, so you can't carry a plate, and standing at the stove may be off limits. Set things up before surgery (our home prep guide for orthopedic surgery covers the rest of the house):

  • Cook ahead and freeze single portions. Chili, soups, egg muffins and burrito bowls reheat in one container.
  • Move daily items to counter height. Anything you'd need to bend or reach for goes between waist and shoulder level.
  • Prep sitting down. Use a sturdy stool at the counter, not a rolling office chair.
  • Carry with a backpack. Lidded containers, a screw-top jar and a shaker bottle ride safely in a backpack between kitchen and couch.
  • Build a couch station. A small cooler with water, milk boxes, cheese sticks and ready-to-drink shakes, plus a basket of fruit, nuts and jerky.
  • Buy no-chop food. Rotisserie chicken, bagged slaw, microwave rice pouches, frozen vegetables and frozen fruit for smoothies.
  • Clear the path. Pick up rugs and cords, and wipe spills right away. Wet floors and crutch tips don't mix.

Sample day: about 100 g of protein

  • Breakfast: overnight oats made with milk and Greek yogurt in a screw-top jar, topped with berries
  • Lunch: rotisserie chicken wrap with bagged slaw and a kiwi
  • After PT: cottage cheese with pineapple, or a protein shake
  • Dinner: sheet-pan salmon and potatoes with frozen broccoli
  • If you're hungry later: a glass of milk or a cheese stick

Check labels as you go. You're aiming for about 25 g at each of four meals. Oats, pears, prunes, beans and plenty of water help if pain medicine slows your digestion.

What not to eat after knee surgery

  • Alcohol, especially with prescription pain medicine or sleep aids.
  • Training-day extras while you're inactive: sports drinks, energy bars and big pasta portions.
  • Crash diets or skipped meals to "make up" for couch time.
  • Smoking and vaping. Studies on smoking and meniscus surgery are mixed, but a 2025 systematic review still advised quitting, especially before demanding procedures like repairs done with ligament surgery [11].
  • New supplements you haven't cleared with your surgeon.

Supplement safety: some herbal products, such as ginkgo and garlic, can affect bleeding. Anesthesia groups advise stopping herbal products 1 to 2 weeks before elective surgery [12], and your surgeon sets the exact dates. Thrive kits contain fish oil and turmeric in low amounts, and you don't need to stop them before surgery. Tell your surgeon and anesthesiologist about everything you take.

When to call your care team

Call your surgeon's office if you notice:

  • Fever or chills
  • Redness, warmth or drainage around the incisions
  • Calf pain, swelling or tenderness
  • You can't keep fluids down, or your urine stays very dark
  • No bowel movement for several days, with belly pain or bloating
  • A loss of appetite that doesn't improve

This list doesn't replace the instructions your surgeon gave you. For chest pain or trouble breathing, call 911.

Where Thrive fits

Disclosure: this is Thrive Protocol's own site, so weigh our product suggestions with that in mind. Your meals should do most of the work. Our kits are for the days when 100 grams of protein feels out of reach, like the first week on crutches when cooking is a chore.

Each OptiFuel packet has 25 g of whey protein and 3 g of leucine, plus glutamine, collagen, omega-3s, curcumin and vitamins. One packet covers about a quarter of a 100 g daily target.

  • Surgery still ahead: the Surgical Protocol Kit (4-week supply $299.99) includes OptiCharge for the night before. Ideally, everyone on this kit also takes the Recovery and Strength Mix daily.
  • Surgery already done: the Recovery Protocol Kit (4-week supply $289) is the same OptiFuel without OptiCharge.
  • Back to strength work: the Recovery and Strength Mix ($49.99) lists 5 g of creatine monohydrate and 3 g of leucine and is designed to support muscle recovery and strength.

Want the full label and a side-by-side with other options before you buy? Read our Surgical Protocol Kit review.

Start the kit 1 week before surgery. The fish oil and turmeric in OptiFuel are low-dose, so there's no need to stop it before surgery, though your surgeon's instructions come first. Thrive kits are HSA/FSA eligible: you can pay with your HSA or FSA card at checkout or submit the receipt for reimbursement.

These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.

Get the free Surgery Recovery Guide

Our free Surgery Recovery Guide puts eating, fluids, movement and sleep for the weeks after surgery on one page. Print it and stick it on the fridge for whoever is helping you cook.

Frequently asked questions

How much protein should I eat after meniscus surgery?

A common surgical estimate is about 1.5 grams per kilogram of body weight a day [6]. For a 150 lb (68 kg) person that's about 100 grams, or roughly 25 grams at each of four meals. Your surgeon or a dietitian may set a different number.

What is the best protein powder after knee surgery?

The best one is the one you'll drink every day. Look for about 25 g of protein per serving, so one shake covers one of your four meals, plus third-party testing such as Informed Sport. Whey is a milk protein, so skip it with a milk allergy, and check with your doctor first if you have kidney disease. For a wider look, see our guide to the best supplements for surgery recovery.

When should I start a protein supplement before knee arthroscopy?

Thrive kits are designed to start about 1 week before surgery. The fish oil and turmeric in OptiFuel are low-dose, so there's no need to stop it before surgery. Herbal products are different: anesthesia groups advise stopping them 1 to 2 weeks before elective surgery [12]. Your surgeon's instructions come first.

Should I eat less while I'm on crutches?

Eat a bit less, but don't diet. You burn fewer calories when you're inactive, and gaining fat during inactivity has been linked with more muscle loss [7]. Cut training extras like sports drinks and dessert, and keep protein at every meal.

Does collagen help after meniscus surgery?

We don't know yet. Collagen with vitamin C raised collagen production markers in small studies of healthy men when taken an hour before exercise [8, 9], but no trial we found shows it improves meniscus repair healing [10]. Ask your surgeon before adding it.

What foods should I avoid after meniscus surgery?

Skip alcohol, especially with pain medicine. Go easy on sugary drinks and snacks that replace real meals, avoid nicotine, and don't start new supplements without your surgeon's okay, since some can affect bleeding [12].

References

  1. McLeod MM, Gribble P, Pfile KR, Pietrosimone BG. Effects of arthroscopic partial meniscectomy on quadriceps strength: a systematic review. J Sport Rehabil. 2012;21(3):285-295. PubMed
  2. Spang RC 3rd, Nasr MC, Mohamadi A, et al. Rehabilitation following meniscal repair: a systematic review. BMJ Open Sport Exerc Med. 2018;4(1):e000212. PubMed
  3. Bensa A, Piano A, Fumagalli GA, et al. Return to sport after meniscectomy, meniscal repair, and meniscal allograft transplantation for meniscal lesions in athletes: a systematic review and meta-analysis. Knee Surg Sports Traumatol Arthrosc. 2026. doi:10.1002/ksa.70404. PubMed
  4. Kilroe SP, Fulford J, Jackman S, et al. Dietary protein intake does not modulate daily myofibrillar protein synthesis rates or loss of muscle mass and function during short-term immobilization in young men: a randomized controlled trial. Am J Clin Nutr. 2021;113(3):548-561. PubMed
  5. McGlory C, Gorissen SHM, Kamal M, et al. Omega-3 fatty acid supplementation attenuates skeletal muscle disuse atrophy during two weeks of unilateral leg immobilization in healthy young women. FASEB J. 2019;33(3):4586-4597. PubMed
  6. Weimann A, Braga M, Carli F, et al. ESPEN guideline: Clinical nutrition in surgery. Clin Nutr. 2017;36(3):623-650. PubMed
  7. Biolo G, Agostini F, Simunic B, et al. Positive energy balance is associated with accelerated muscle atrophy and increased erythrocyte glutathione turnover during 5 wk of bed rest. Am J Clin Nutr. 2008;88(4):950-958. PubMed
  8. Shaw G, Lee-Barthel A, Ross ML, Wang B, Baar K. Vitamin C-enriched gelatin supplementation before intermittent activity augments collagen synthesis. Am J Clin Nutr. 2017;105(1):136-143. PubMed
  9. Lis DM, Baar K. Effects of different vitamin C-enriched collagen derivatives on collagen synthesis. Int J Sport Nutr Exerc Metab. 2019;29(5):526-531. PubMed
  10. Zahed M, Elmesalmi M, El Menawy Z, et al. Collagen-based interventions for meniscal tears: a systematic review of clinical outcomes, safety, and MRI findings. Cureus. 2025;17(11):e97929. PubMed
  11. Zabrzyński J, Pękala J, Zabrzyńska M, et al. The impact of smoking on meniscus surgery: a systematic review. EFORT Open Rev. 2025;10(4):193-202. PubMed
  12. Elvir Lazo OL, White PF, Lee C, et al. Use of herbal medication in the perioperative period: potential adverse drug interactions. J Clin Anesth. 2024;95:111473. PubMed

This guide is general education and isn't a substitute for advice from your own surgeon, physical therapist or registered dietitian.

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