Weight loss surgery aftercare

Written by: Mr Bart Decadt
Published: | Updated: 27/04/2023
Edited by: Lisa Heffernan

Losing weight can improve not only how you feel about yourself, but it can greatly improve your life expectancy by reducing health risks associated with excess body weight like type 2 diabetes, high blood pressure, heart disease, joint disease, sleep apnoea, fatty liver disease and some types of cancer. Bariatric or weight loss surgery is recommended for adults with a body mass index (BMI) of over 40 or a BMI of over 35, accompanied by another disease, after all non-surgical weight loss measures have failed.


Experienced consultant general surgeon Mr Bart Decadt talks to us about what happens after weight loss surgery and if there is a specific diet that must be followed.

When can I leave hospital following weight loss surgery?

Weight loss patients can go home when they are pain-free, fully mobilised, drinking free fluids and have a normal early warning score (which means normal observations such as a normal pulse, blood pressure, temperature, and urine output).


This is the case for almost all patients the day after weight loss surgery, so, after a one-night hospital stay.



What does a diet plan post weight loss surgery look like?

Healthy eating is essential after weight loss surgery. It’s recommended to eat around 1500 calories a day to provide good weight loss. It helps to use a 7-inch plate and small cutlery.


During the first 2 to 3 weeks after weight loss surgery, food will be in liquid form, which may cause constipation or diarrhoea until solids are re-introduced. If constipation continues, natural fruit juice like prune or fig juice can be of benefit. Foods such as bread, chicken, tough meats and the skin on some fruits and vegetables can be difficult to tolerate in the long term. Look for foods that are easy to digest to allow the digestive system to heal. It’s also advised to avoid foods with more than 8 grams of sugar in every 100 grams to aid with weight loss.


It’s important that you drink at least two litres of water a day, that’s eight to ten cups, following weight loss surgery, as fluid intake is reduced. If your urine is a pale straw colour, then you’re drinking enough. Fizzy drinks should be avoided as they can cause excess gas and discomfort following the operation.


Some patients will suffer from trapped gas and bloating for a few days following their bariatric surgery, for which fennel and peppermint tea can help relieve these symptoms. Your surgeon will give you a diet plan to follow and will help you to make lifestyle changes that will ward off the weight.



When can I start to exercise after weight loss surgery?

It’s encouraged not to increase physical activity post bariatric surgery until you are back to your pre-operative normal after about two weeks. Exercise will help to relieve symptoms of trapped gas and reduce the risk of blood clots in the legs (DVT) and help to increase your metabolism. However, it’s recommended to walk for the first two weeks, after which you can exercise for 30 minutes three to four times a week.


What are the signs of any side effects post weight loss surgery?

Your bowel movements may be less frequent post weight loss surgery as you won’t have the same volume of food passing through. This will improve when you gradually start reintroducing bulk foods and fibre into your diet.


Post-surgery tiredness is also quite common. Small meals are recommended throughout the day to keep your energy levels up because your body is used to a much greater quantity of calories. As with bowel movements, your energy levels will improve once you begin to eat bigger meals.


Some patients may experience stomach pains and nausea, however, if this becomes a frequent occurrence, it’s advised to contact your bariatric surgeon.




If you’d like more information about bariatric surgery and aftercare, why not book a consultation with Mr Bart Decadt via his Top Doctors profile.

By Mr Bart Decadt

Mr Bart Decadt is an experienced consultant general surgeon based in Manchester, Cheshire, Warrington and Blackpool. He is an expert in laparoscopic bariatric and upper GI surgery (including surgery for hernias, gallbladder problems and acid reflux).

Mr Decadt originally qualified in Belgium. He performed his surgical training at the University of Cape Town (South Africa) and in Manchester (UK). He gained an MD at the University of East Anglia on Evidence Based Laparoscopic Surgery where he was involved in the first gastric band procedures performed in the UK in 1997. Mr Decadt won the 1st European prize in Linz (Austria) in 1999 (EAES congress) with his randomised study comparing the best surgical versus the best medical treatment for patients with severe acid reflux disease. This world-unique study involving over 300 patients proved for the first time the superiority of laparoscopic anti-reflux surgery above medication in terms of quality of life and longterm outcome.

Mr Decadt was appointed consultant surgeon at Stockport NHS Foundation Trust in 2005 where he was Lead Consultant for Upper GI Surgery. He also obtained an honorary consultant position in Manchester Royal Infirmary where he pioneered laparoscopically assisted surgery for stomach and oesophageal cancer. He was part of the surgical team granted one of the first NHS bariatric contracts in the UK in 2007 involving over a 1000 patients.

Mr Decadt performs all routine bariatric (weight reducing) and diabetic (treating type 2 diabetes) surgical procedures including gastric sleeve, bypass, band, balloon and revisional procedures. He is committed to providing his patients with the highest standard of care, making sure that the best service is given through each step of their weight-loss journey.

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