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Part two of our frequently asked questions series is below. Part one covered insurance, and letter of medical necessity.

How much weight can I expect to lose after undergoing gastric bypass or Lap-Band/Realize Band surgery? How long will it take to lose the weight?

With Lap-Band/Realize Band surgery, an average patient loses about 50 percent of excess body weight. This weight loss occurs over a period of two to three years, with the majority of weight loss occurring in the first year. With gastric bypass surgery, patients with a BMI over 50 tend to lose about the same amount as Lap-Band/Realize Band patients, about 50 percent of excess body weight. Gastric bypass surgery patients with a BMI under 50 often lose about 70 percent of their excess weight. Following a gastric bypass, our patients in Dallas and greater Texas can expect to lose about three-quarters of their total weight loss in the first six months; the rest occurs by one year to 18 months.

Can my gastric bypass or Lap-Band/Realize Band surgery be reversed in the future?

Gastric bypass surgery cannot be easily reversed. Lap-Band/Realize Band surgery, however, is more easily reversible. If necessary, you may undergo surgery to remove, replace, or alter the band. Please understand that reversal of any bariatric procedure would mean regaining the weight that you have lost. Bariatric surgery is meant to be a lifelong commitment.

What happens if I don’t obey my dietary guidelines following weight loss surgery?

Ignoring dietary guidelines following surgery can slow down weight loss and make you sick. Many gastric bypass patients who overeat and consume high-fat and high-sugar foods experience “dumping syndrome,” which is characterized by sweating, fatigue, and diarrhea. Overeating can also cause vomiting.