Life After Bariatric Surgery: The First Five Years

The first five years after bariatric surgery follow a broadly predictable pattern: rapid weight loss in the first year, a slower phase as the body adjusts, some regain, and then a long-term plateau. Alongside that come permanent changes to how you eat, lifelong supplements and blood tests, an emotional adjustment that is often underestimated, and, for most people, loose skin. Knowing what to expect makes each stage easier to manage.

This topic is also in our free guide, Bariatric Surgery: Before and After. Get it emailed to you

The first months: relearning how to eat

Eating after surgery progresses in stages. You start on liquids only, move to pureed food over the following weeks, then return to solids. Meals are much smaller, and you may need to stop drinking with meals because of the stomach’s smaller size (healthdirect). After a gastric bypass, long-term dietary management is needed to avoid dumping syndrome, a group of symptoms that can follow carbohydrate-rich meals (AJGP, 2025; healthdirect).

A plate of chicken, broccoli, eggs, tomato and salad

With a much smaller capacity, the quality of each mouthful matters more. Protein can easily fall short in this phase, and that affects how much muscle you keep while the weight comes off. An Accredited Practising Dietitian can set targets and a plan that suits your operation. Dr Kumar’s patients work with Amy Kellner APD, and the principles are covered in protein and muscle while losing weight.

Supplements and blood tests, for life

A daily multivitamin is essential for life after bariatric surgery. Deficiencies affecting more than 10% of people after sleeve gastrectomy or gastric bypass include iron, vitamin B12, folate, vitamin D, several other B vitamins, vitamins A, C and E, magnesium, zinc and selenium, and annual nutritional screening bloods are recommended (AJGP, 2025). The American Society for Metabolic and Bariatric Surgery suggests nutrient checks every three to six months in the first year and annually after that (ASMBS, 2017). Your bariatric team and GP will set the schedule that applies to you.

Deficiencies can develop slowly and without obvious symptoms, which is why the tests continue even when you feel well. The detail is on nutrition after bariatric surgery.

Other follow-up

Medications. As weight falls, blood pressure and diabetes medicines often need adjusting. Reviews every one to two weeks may be needed early on (AJGP, 2025).
Reflux. After a sleeve gastrectomy or one-anastomosis bypass, a gastroscopy is recommended at one year and then every two to three years (AJGP, 2025).
Your GP. Long-term care mostly sits with your GP. See working with your GP and health checks and investigations.

How weight changes over five years

Most weight is lost in the first year. Australian data reported in the AJGP show average total weight loss of 28.2% at one year after a sleeve gastrectomy and 30.8% after a Roux-en-Y gastric bypass, easing to 23.7% and 27.2% respectively at five years, and holding at about those levels to ten years (AJGP, 2025). In the review’s words, some regain is typical before weight stabilises at around five years.

Regain of a few kilograms after the low point is expected and is not a sign the operation has failed. Larger or continuing regain is worth raising early with your GP or bariatric team, as there are options at every stage. These are averages, and individual results vary. Keeping the weight off and weight-loss plateaus cover the habits that make the most difference.

The emotional side

Surgery changes the body faster than the mind can always keep up. A JAMA meta-analysis found that about 19% of people seeking bariatric surgery had depression and 17% had binge-eating disorder (Dawes et al., JAMA, 2016). These conditions do not disappear with the weight, and food may no longer be available as a way of coping.

Alcohol needs particular care. A large US study found the proportion of people with an alcohol use disorder rose from 7.6% before surgery to 9.6% two years after, with a higher risk after gastric bypass than after banding (King et al., JAMA, 2012).

Support is available. Your GP can prepare a Mental Health Treatment Plan for Medicare-subsidised psychology sessions (Department of Health, Better Access), ANZMOSS keeps a directory of psychologists who work with bariatric patients (ANZMOSS), and the Butterfly Foundation helpline (1800 33 4673) supports people with eating and body-image concerns (Butterfly Foundation). More is on mental health and weight loss.

Loose skin

As the weight comes off, loose skin becomes visible, usually around the abdomen, arms, thighs, chest and back. In a Swedish post-bariatric study, 91% of women and 67% of men felt their body looked unattractive because of excess skin, and 61% wanted surgery on two or more areas (Obesity Surgery, 2013).

Skin removal is usually considered 12 to 18 months after the bariatric operation, once weight has been stable for four to six months (Giordano, Open Access Surgery, 2015). A stable weight for at least three months has been linked to fewer complications (van der Beek et al., Obesity Facts, 2011). For most people that places skin surgery somewhere in the second or third year. When is the right time for skin removal explains how to judge it, and preparing your nutrition before body contouring surgery covers the blood tests and protein that matter beforehand.

A rough timeline

Weeks 0–8: liquid, puree and soft diet; medication adjustments; supplements start.
Months 2–12: fastest weight loss; protein and resistance training to protect muscle; first blood tests and, after a sleeve or one-anastomosis bypass, a gastroscopy at one year.
Years 1–2: weight slows and settles; loose skin becomes the main physical issue for many; planning for skin surgery can begin once weight is stable.
Years 2–5: some regain is common before a long-term plateau; annual bloods and supplements continue.

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. For the operations themselves, see drkumar.com.au and the risks and considerations of surgery.