Most patients who have gastric bypass (also known as Roux-en-Y) surgery are able to maintain successful weight loss, according to the American Society for Metabolic and Bariatric Surgery. Gastric bypass surgery is credited for being the most effective treatment for obesity in Western Medicine, with with gastric sleeve surgery close behind. But not all gastric bypass patients lose weight equally or maintain their weight loss long term. Researchers at Binghampton University in New York set out to find out what factors might influence these discrepancies.
Weight loss happens when you burn more calories than you take in, creating a calorie deficit. For gastric sleeve, gastric bypass, and lap band surgery patients, maximizing this calorie deficit is important to maximize weight loss. To do that you would have to know how many calories you are taking in and how many you are burning each day.