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Gastric Bypass Surgery
Gastric Bypass Surgery via the Roux-en-Y
This is generally considered to be the best surgical procedure for
the treatment of morbid obesity. Weight loss is achieved by reducing
the functional portion of the stomach to a pouch one ounce or less
in size, and by creating a stoma, a small opening between the
stomach and the intestine.
After the gastric bypass procedure, a small size of the stomach
pouch causes the patient to have a sensation of fullness after
eating only a small portion of food. The small stoma delays stomach
emptying, making the sensation of fullness last longer. These are
called the Restrictive components of the procedure.
Food does not pass down the Bypassed limb, only the Roux limb and
the Common Channel. The longer the Bypassed limb, the less the
length of intestine actively working to absorb nutrients from the
food that is eaten.
Digestive juices that normally help absorb nutrients from the food
enter the Bypassed limb from the larger portion of the stomach, the
liver, and the pancreas, and pass down the Bypassed limb to the
Common Channel.
After Gastric Bypass Surgery
Patients will be on a clear liquid diet for the first few days
immediately following gastric bypass surgery, and then advance to a
pureed diet.
Patients experience the most rapid weight loss during this period.
They are often thrilled to see the weight coming off, sometimes at
the rate of 20 pounds a month, but it is not an easy time. Patients
feel the loss of calories taken in, and are sometimes low in energy.
Their small pouch will make them uncomfortable when they eat too
much or too fast. They may have diarrhea, which can usually be
controlled by avoiding certain foods or by taking medication. They
may experience hair loss, though the hair usually begins to grow
back within a few months.
At 6 months after the gastric bypass surgery the patients will
probably be on their long-term maintenance diet, which is more or
less what and how they will eat for the rest of their lives. The
maintenance diet for the most part consists of regular table foods,
but in small portions. Most patients describe their meals as child
sized, and they often do not finish what they are served. The
patients generally become comfortable eating these small meals, and
almost always say the loss of the ability to enjoy large meals or
certain foods is more than compensated for by being able to
successfully control their weight.
Gastric Bypass Weight Loss
Patients may expect to lose approximately 70% of their excess body
weight during the first 2 years following surgery. Sometimes a
weight regain of about 10% is seen between years 2 and 5, perhaps
because the small pouch increases several ounces in size, and
perhaps because the patients learn how to take in extra calories
without making themselves sick.
The surgical community involved in gastric bypass surgery is very
concerned about this late 10% or any other weight regain. There is a
national effort underway to keep patients involved in support groups
and in follow-up with their doctors to reinforce what they had been
taught after surgery, and what had worked for them the first 2
years. Long term success with this operation requires a team effort
of both the patients and their doctors.
Gastric Bypass Surgery patients take in less food and absorb less of
what they take in, making them at risk for developing nutritional
deficiencies. They must also make a lifelong commitment to taking
vitamin, mineral, and possibly protein supplements.

Park Plaza Hospital and Medical Center
1313 Herman Dr.
Houston, TX 77004
Call 1-888-248-8086
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