Weight loss interventions that work: Surgery
If you are severely overweight and have not been able to lose an adequate amount of weight with lifestyle changes or weight loss medications, or if you have serious health issues related to obesity, bariatric (or weight loss) surgery is a potential option.
“You consider surgery when other therapies for obesity fail,” said Sue Cummings, a registered dietitian who was clinical programs coordinator at the Massachusetts General Hospital Weight Center for the past 20 years. “The person has been through everything — and now they have diabetes, hypertension, sleep apnea, arthritis. … That’s when you would really start to think about surgery.”
Bariatric surgery procedures
Weight loss surgeries performed in the US include gastric bypass, sleeve gastrectomy (also known as gastric sleeve) and a procedure called biliopancreatic diversion with duodenal switch. The latter has the best outcomes in terms of weight loss and remission of many medical conditions associated with obesity, according to Cummings. However, it also carries the most risks.
The adjustable gastric band is another option, though long-term risks associated with the band have led to a significant decrease in surgeons performing the procedure, Cummings said.
In essence, the reason most bariatric surgeries are so effective in producing long-term weight loss is that they strongly affect the physiological regulation of body weight, interfering with signals that defend against starvation and weight loss, Cummings explained. This ultimately changes a person’s set point, or the level at which weight tends to stabilize.
“Surgery literally changes how your body regulates body weight,” she said.
Benefits and risks
An individual’s response to weight loss surgery varies, although on average, people who have bariatric surgery lose 15% to 35% of their starting weight. Gastric bypass tends to result in more weight loss than the band or gastric sleeve, Cummings said, though “every bariatric procedure studied demonstrates similar wide variations in outcomes among patients.”
As a consequence of weight loss, bariatric surgery can improve many health conditions related to obesity, including type 2 diabetes, sleep apnea, high blood pressure, high cholesterol levels, acid reflux and joint pain. In gastric bypass, improvement in diabetes occurs within days of surgery and is independent of weight loss. The reason is due to hormonal changes, which enhance insulin’s response to nutrients, Cummings explained.
The benefits of weight loss surgery do not come without risks and long-term considerations, however. “About 10% to 20% of patients fail to lose a significant amount of weight, and others experience significant or premature weight regain,” Cummings said.
Complications of surgery may include infection, bleeding, poor absorption of nutrients or dehydration early on, as well as ulcers and hernias. A side effect of gastric bypass known as “dumping syndrome” can occur shortly after eating and may result in nausea, dizziness, weakness, cold sweats, cramps and diarrhea.
It’s important to recognize that lifestyle changes after surgery are extremely important. That includes avoiding many food temptations that surround you, such as fast food french fries and the scones at the local coffee shop.
“Surgery is not going to change the environment; therefore, combining lifestyle changes with surgery will produce the best outcomes,” Cummings said. Those changes include eating more whole foods, avoiding refined and processed foods, and increasing physical activity each day.
Additionally, lifelong supplementation of vitamins and minerals — including iron, calcium, folate, vitamins B12 and B1 and vitamin D — is required. “The risk of deficiencies increase as a patient progresses from surgery, so all patients need to have their nutritional labs monitored yearly for life,” Cummings said.
The decision to have weight loss surgery is not an easy one. Every patient needs to be fully informed of the risks and the benefits, and should be evaluated by a multidisciplinary team including a surgeon, a doctor (their primary care physician and/or an obesity medicine specialist), a registered dietitian and a mental health professional, Cummings explained.
Additionally, a full benefit-risk analysis should be performed.
“Do the benefits outweigh the risks? If so, surgery is the most effective therapy,” Cummings said, adding that “data show an increased life expectancy due to the remission and/or resolution of over 190 medical conditions associated with obesity, such as type 2 diabetes, heart disease, sleep apnea, high blood pressure, kidney failure and more.”
Lisa Drayer is a nutritionist, an author and a CNN health and nutrition contributor.
News credit : Cnn