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Obesity:

The complications of surgery fall into 4 categories:

Nutritional - Vitamin and calcium deficiencies are common enough to require all patients who have had a malabsorptive procedure to be prescribed supplements.
Regular follow up and blood tests are required to monitor these chemicals.
This is extremely uncommon in patients with a restrictive procedure.

Cosmetic - There may be adverse cosmetic results from rapid and dramatic weight loss.
Skin may not return to normal and hang in lax folds.
Cosmetic surgery may be required to improve the appearance of certain body parts such as the abdomen.

Dumping - This is a constellation of symptoms which may occur after malabsorptive surgery.
In essence the intestine is not designed to accept food in the new configuration and certain food stuffs, especially high sugar loads, leads to nausea, light headedness and diarrhoea.
Whilst not strictly dangerous these symptoms may be quite distressing, and serve as a reminder to the patient who may "cheat" with their diet.

Vomiting - Patients who do not chew their food sufficiently or attempt to eat too much at one time may overstretch their gastric pouch and consequently vomit.
This effect is generally confined to patients who have had a restrictive procedure.

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Advanced Laparoscopic Surgery Techniques by Nicholas Marshall