Preparing Your Nutrition Before Body Contouring Surgery

Body contouring surgery after major weight loss involves long wounds that need protein, iron, vitamins and minerals to heal. Many people reach this point with gaps in exactly those nutrients, particularly after bariatric surgery. Checking your bloods and building up your protein intake with your GP and a dietitian, months rather than weeks beforehand, is one of the most useful things you can do to prepare.

This topic is also in our free guide, Is Now the Right Time?. Get it emailed to you

Why nutrition affects healing

Wound healing is a building process. A review of post-bariatric patients undergoing body contouring identified the nutrients most closely linked to healing as protein, vitamin A, vitamin C, the B vitamins, the amino acids arginine and glutamine, iron, zinc and selenium (Agha-Mohammadi and Hurwitz, Plastic and Reconstructive Surgery, 2008). When these are low, the body has less to work with as it repairs.

Healing problems are among the risks of body contouring after weight loss. In a Dutch study of post-bariatric patients, the overall complication rate was 27.9%, seroma (a fluid collection) was the most common problem, and complications were more frequent at a BMI above 30 (42.3%) than below it (19.5%) (van der Beek et al., Obesity Facts, 2011). Not every complication is nutritional, but nutrition is one of the factors you can improve before surgery. The full picture of surgical risk is on risks and considerations and on Dr Kumar’s surgical website.

How common are deficiencies?

Deficiencies are common after bariatric surgery generally. More than 10% of people after a sleeve gastrectomy or gastric bypass are affected by deficiencies of iron, vitamin B12, folate, vitamin D, zinc and several other nutrients (AJGP, 2025). Studies of people preparing for skin surgery show a similar pattern:

In a US group of 48 post-bariatric patients seeking body contouring, 38% had low prealbumin (a marker of protein status), 33% were vitamin A deficient, 32.6% had low haemoglobin, 16.3% were iron deficient and 9.5% were vitamin B12 deficient. With nutritional supplementation, complications fell to levels comparable with patients of normal weight (Agha-Mohammadi and Hurwitz, Aesthetic Plastic Surgery, 2010, as summarised by Dr Arya Sharma).
In a Brazilian group of 32 patients at least two years after bariatric surgery and weight-stable for at least six months, 56% had anaemia, 31.2% were iron deficient, 25% were vitamin B12 deficient and 18.7% were zinc deficient, with mild deficiencies in protein markers (Revista Brasileira de Cirurgia Plástica).

These are small studies, but the message is consistent: feeling well and having a stable weight do not mean your nutrient levels are where they should be. Deficiencies are also possible after weight loss through diet or medication, particularly if your intake has been very low for a long time.

Blood tests commonly checked

A peer-reviewed review of skin removal after massive weight loss recommends haemoglobin or haematocrit, a basic metabolic panel and prealbumin before surgery (Giordano, Open Access Surgery, 2015). Your GP may also check:

Full blood count, for anaemia.
Iron studies, including ferritin.
Vitamin B12 and folate.
Vitamin D.
Protein markers such as albumin or prealbumin, kidney function and liver function.
HbA1c if you have, or have had, diabetes.

There is no single agreed cut-off that applies to everyone for most of these markers. What counts as ready for surgery is a judgement your surgeon makes alongside your GP, based on the full set of results and your health overall. Bring copies of recent results to your consultation; health checks and investigations has more on what each test measures.

Protein and supplements

The same review gives a protein goal of 70–100 g per day around the time of surgery, and lists iron, vitamin B12, calcium and a multivitamin as common supplements (Giordano, Open Access Surgery, 2015). Which of these you need, and in what amounts, depends on your results and your operation history, so take advice rather than adding supplements on your own. Protein and muscle while losing weight covers practical ways to reach a protein target when your appetite or stomach capacity is small.

When to start

Iron stores, vitamin levels and protein status take time to rebuild, so the useful window is while your weight is settling, not the weeks before an operation date. Skin removal is typically considered 12 to 18 months after bariatric surgery, once weight has been stable for four to six months (Giordano, Open Access Surgery, 2015). Using that stable period to check and correct your nutrition means you arrive at your consultation better prepared. See when is the right time for skin removal.

If you are taking a GLP-1 weight-loss medicine, Australian peri-operative guidance from 2025 does not recommend stopping it before elective surgery; instead, a clear-fluid diet the day before is used (Australian Diabetes Society and partners, 2025). Medication decisions belong with your prescribing doctor, and your surgical and anaesthetic team must know you are taking it. More is on weight-loss medication before surgery.

Working with your GP and a dietitian

Your GP orders and interprets blood tests, treats deficiencies (for example with iron infusions or B12 injections where needed) and manages other conditions such as diabetes. See working with your GP.
A dietitian sets your protein target, reviews what you actually eat and builds a plan that fits your stomach capacity and routine. Dr Kumar’s patients work with Amy Kellner APD, an Accredited Practising Dietitian who sees patients before and after surgery and consults by telehealth anywhere in Australia.
Dr Kumar considers your results as part of planning, so bring recent copies to your consultation.

A simple preparation checklist

Ask your GP for nutrition bloods once your weight is settling, and keep copies.
Take any prescribed supplements consistently, including your bariatric multivitamin.
Work on a daily protein target with a dietitian.
Keep up resistance training to protect muscle.
Stop smoking well ahead of surgery.
Recheck bloods if anything was low, before your surgery date.

For the operations themselves, Dr Kumar’s procedure guides cover each one in detail, including staging, Medicare and recovery.

Where to next

If your weight has settled and loose skin is now the main issue, book a consultation with Dr Kumar or take the readiness assessment. Individual results vary, and suitability for surgery is assessed in person.