What to Eat Before & After Surgery (From Orthopedic Surgeons)
From Talking With Docs.
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What you eat before and after surgery can affect how well you heal, how strong you stay, and even whether your surgery goes ahead on the day. There's no single magic meal that guarantees success, but a few things matter far more than most people realize, and a couple of popular "healing" supplements matter a lot less.
In this episode of Talking With Docs, orthopaedic surgeons Dr. Brad Weening and Dr. Paul Zalzal break down what to eat before and after surgery, with a focus on hip and knee replacement. They explain what your body actually needs around the time of an operation, why fasting rules exist, which supplements are worth asking about, and why your bowels deserve more attention than you think.
New to joint replacement? Watch: Top Five Mistakes People Make After Total Knee Replacement: https://youtu.be/yqXtTDVKSCk
You'll learn:
Why a crash diet right before surgery can backfire, and when to start eating well instead
The 3 things surgeons focus on: muscle, tissue repair, and your bowels
Why protein matters for keeping muscle and healing tissue
Why you need enough calories and carbohydrates for energy
What NPO means and why you have to fast before surgery
How aspiration happens, and why an empty stomach protects your lungs
The general 8-hour, 6-hour and 2-hour fasting rules, and why fatty food matters
Why you should tell your team if you take a GLP-1 medication
How eating the wrong thing at the wrong time can get your surgery cancelled
Why many people are low in iron even when their hemoglobin looks normal
How a ferritin test checks your iron stores before surgery
What carb loading can and can't do
The "triple blow" to your bowels: less movement, the anesthetic, and opioids
Why fibre and fluids are your best defence against constipation after surgery
Why you still need enough calories even when you're moving less
How much protein to aim for per meal (25 to 35 grams)
When a meal replacement drink can help if you have no appetite
Whether extra vitamin C, zinc or magnesium speeds up healing
Why high-dose zinc can lead to copper deficiency
Why eating collagen doesn't go straight to rebuilding your tissues
One of the most practical takeaways from this conversation is about timing. Your hospital will give you exact instructions on when to stop eating and drinking, and those are the ones to follow. In general, heavier or fatty meals need about 8 hours, a light meal about 6 hours, and clear fluids about 2 hours. Fat slows down how fast your stomach empties, so a greasy breakfast you thought was harmless can be enough to postpone your operation. If you take a GLP-1 medication, tell your medical team early, because these drugs can slow stomach emptying too.
After surgery, what the doctors worry about most is your bowels. Being less mobile, the anesthetic and post-operative opioids all slow things down at the same time. Fibre and fluids help keep things moving, and a simple check is that if you're not peeing, you're probably not drinking enough. Protein still matters for repair, ideally spread across the day at roughly 25 to 35 grams per meal. If you've had abdominal surgery, your surgeon may give different advice on fibre, so check first.
Correcting a real deficiency makes sense, but taking more than you need generally doesn't. If you're worried you might be low in iron, ask your doctor about checking your ferritin before surgery. The best preparation is simple: a healthy diet, enough calories, enough protein, and plenty of fibre and fluids, starting well before your operation.
What was your last meal before surgery, and what helped you most during recovery? Let us know in the comments.
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🛑 DISCLAIMER: This content is for educational purposes only and should not replace professional medical advice. Nutrition needs before and after surgery vary from person to person and from procedure to procedure, and decisions about fasting, diet, supplements, and medications should be individualized based on your health history and the type of surgery you're having. Always follow the specific instructions provided by your surgeon, anesthesiologist, hospital, and healthcare team. Full disclaimer at talkingwithdocs.com.
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