Does Surgery Cause Weight Loss

by Al Paterson


In most cases, postsurgical weight gain is temporary and subsides as your body recovers. However, prolonged recovery time, physical inactivity, stress, and changes in your eating behavior can lead to weight gain over time.

How fast is weight loss after surgery?

Most patients find that they lose weight quickly in the first three months immediately following surgery, and then weight loss starts to gradually taper off after that. The type of procedure that you have also factors into how fast you can expect to lose weight.

Do you burn more calories after surgery?

In fact, your calorie needs are now greater than usual because your body requires energy from nutritious foods to fuel the healing process. You will need to consume about

Does surgery weaken the body?

Any type of major surgery can stress the body and suppress the immune system. The reasons for this aren’t fully understood, but we do know that surgery and the anesthesia medications given to help make you sleep can be hard on the body.

Why am I losing so much weight after surgery?

Causes of Weight Loss Post-Op

Some pain management drugs can cause a loss of appetite in certain patients, which can make it difficult to keep your weight at healthy levels post-op. The lingering effects of anesthesia can also cause loss of appetite, as well as nausea and vomiting.

How much weight do you lose post surgery?

In the first 6 to 8 weeks after surgery, most patients (regardless of their procedure) will lose ~10% of their excess weight. In the following 4 to 5 months, they can expect to lose a total of ~50% of their excess weight.

What would cause me to lose weight without trying?

Unintentional weight loss has many different causes. It might be caused by a stressful event like a divorce, losing a job, or the death of a loved one. It can also be caused by malnutrition, a health condition or a combination of things.

Can surgery change your metabolism?

Surgical stress results in alterations in total body protein metabolism (6), characterized by an increase in protein catabolism (16), negative nitrogen balance (17), and increased protein turnover (18, 19). The net changes in protein catabolism and synthesis are related to the duration and the level of injury.

Are you weaker after surgery?

It is quite common to feel fatigued after surgery, regardless of whether it was a minor or major procedure. This is because your body expends a lot of energy afterward trying to heal. There is an immune response that kicks in, which can be physically draining as well.

How much does your metabolism increase after surgery?

The increase in energy expenditure above basal needs is about 10% for elective operations, 1030% for trauma, 5080% for sepsis, and 100200% for burns (depending on the extent of the wound). Metabolic energy can be derived from carbohydrates, proteins, or fats.


Typical discomforts may include: Nausea and vomiting from general anesthesia. Sore throat (caused by the tube placed in the windpipe for breathing during surgery) Soreness, pain, and swelling around the incision site.

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