Do I really need a special diet before plastic surgery?

You don't need a special diet, but you do need adequate protein and to avoid new restrictive patterns in the two weeks before surgery.

Should I lose weight before surgery?

Not in the two weeks before surgery. Active weight-loss diets in the immediate pre-op window can reduce muscle mass and worsen healing. If your surgeon set a longer-term weight target, plan it earlier.

Do protein shakes count?

Yes. A whey or plant protein shake is a fine way to top up if a normal meal isn't going to happen.

Should I take collagen supplements?

There is no strong evidence that collagen supplementation outperforms a sufficient protein intake. Spend the calories on protein.

Precover · Patient guides

Protein and nutrition before plastic surgery

Short answer. Adequate protein is the single most evidence-supported nutrition lever for surgical recovery. A common target for healthy adults having a moderate-to-major elective procedure is 1.0–1.5 g of protein per kg of body weight per day, starting 1–2 weeks before surgery. GLP-1 use, restrictive diets, recent unintentional weight loss, or bariatric history change the picture and deserve a dietitian conversation.

Reviewed 2026-04-15 · Reviewed by the Precover editorial team. Precover does not provide medical advice. Always confirm specifics with your surgeon, anesthesiologist, and primary care team.

Why protein matters before plastic surgery

Surgery is a controlled injury. Healing relies on protein synthesis — making new collagen, repairing skin and fascia, supporting immune function, and keeping muscle from breaking down while you are less active. Patients who go into surgery undernourished have higher rates of wound complications, infections, and longer recovery, especially after body contouring procedures.

How much protein and when

General pre-op protein targets (confirm with your surgical team)
Procedure intensity	Target	Window
Tier 1 (small, local — e.g. eyelid lift)	Balanced protein at each meal	Days before surgery
Tier 2 (moderate — e.g. breast augmentation, facelift)	About 1.0–1.2 g/kg/day	1–2 weeks before surgery
Tier 3 (major body contouring — e.g. abdominoplasty, mommy makeover)	About 1.2–1.5 g/kg/day	2 weeks before surgery

A 70 kg (155 lb) patient preparing for a tier-3 body contouring procedure would aim for roughly 84–105 g of protein per day in the two weeks before surgery. That's about a palm-sized portion of protein at each meal plus a snack.

GLP-1 medications change the math

If you are on a GLP-1 (Ozempic, Wegovy, Mounjaro, Zepbound, etc.), your appetite is likely lower. That makes hitting a protein target harder, and unintended muscle loss before surgery is a real risk. Strategies your team or a dietitian may suggest include protein-forward small meals, a Greek-yogurt or whey protein shake on busy days, and prioritizing protein at the start of every meal. The perioperative GLP-1 hold itself is a separate clinical decision (see our GLP-1 guide).

Restrictive diets and bariatric history

Strict vegan or fully plant-based eaters can absolutely meet a pre-op protein target — just plan for it. Soy, lentils, tofu, tempeh, edamame, and protein powders make it easier.
Long-term low-carb / keto eaters usually have adequate protein but can be low on iron, B vitamins, and electrolytes — a CBC and iron studies before surgery are a reasonable ask.
Patients with bariatric surgery history (gastric bypass, sleeve, duodenal switch) almost always benefit from a dietitian visit and updated labs (B12, iron, vitamin D, prealbumin) before elective cosmetic surgery.

Two-week pre-op nutrition plan you can bring

Hit your daily protein target every day, starting 14 days before surgery.
Hydrate: about half your body weight in ounces of water per day.
Avoid alcohol, large weight-loss diets, and any new restrictive eating pattern in those two weeks.
Bring a list of all vitamins and supplements to your pre-op visit — many have to pause before surgery.
If you are on a GLP-1, confirm the perioperative hold and resume plan with your surgeon and prescriber.

Frequently asked questions

Do I really need a special diet before plastic surgery?: You don't need a special diet, but you do need adequate protein and to avoid new restrictive patterns in the two weeks before surgery.
Should I lose weight before surgery?: Not in the two weeks before surgery. Active weight-loss diets in the immediate pre-op window can reduce muscle mass and worsen healing. If your surgeon set a longer-term weight target, plan it earlier.
Do protein shakes count?: Yes. A whey or plant protein shake is a fine way to top up if a normal meal isn't going to happen.
Should I take collagen supplements?: There is no strong evidence that collagen supplementation outperforms a sufficient protein intake. Spend the calories on protein.

Sources

ASPEN — Perioperative Nutrition Care of the Adult Surgical Patient · reviewed 2026-04-15
ERAS Society — Enhanced Recovery After Surgery Nutrition Recommendations · reviewed 2026-04-15