More than weight loss – metabolic reset. How does bariatric surgery work and what makes it different from weight loss injections?

In recent years, bariatric surgery has established itself as one of the most effective solutions for treating severe obesity and its associated complications. Although, for many patients, the intervention is still perceived as a radical method to lose weight, the medical reality is much more complex. Today, bariatric surgery is no longer just about pounds, but about a deep reset of metabolic mechanisms.

“We are not only talking about shrinking the stomach, but about an intervention that influences appetite, energy metabolism and chronic inflammation associated with obesity,” explains Dr. Loredana Bărbulescu, General Surgery Primary Physician within the Center of Excellence in Bariatric and Metabolic Surgery at Ponderas Academic Hospital. This perspective completely changes the way the intervention should be understood: not as an aesthetic solution, but as a medical treatment for a chronic disease.

What does gastric sleeve surgery entail?

One of the most frequently performed bariatric interventions globally is the gastric sleeve operation, also known as stomach reduction. The procedure involves removing about 70–80% of the stomach, turning it into a much smaller tube.

The intervention is performed laparoscopically, through small incisions, which means less surgical trauma and significantly faster recovery compared to classic surgery. Patients can usually return to their usual activities in a relatively short time.

Beyond the technical aspect, it is important to understand that the goal of this intervention is not only to limit the amount of food consumed. Reducing gastric volume is only part of the mechanism. Equally important is the influence on the hormonal and metabolic system, which determines how the body perceives hunger and manages energy.

How does the intervention help with weight loss?

Weight loss after gastric sleeve surgery is not the result of a single mechanism, but a complex combination of processes. On the one hand, the smaller stomach leads to the rapid onset of satiety, which causes patients to consume much smaller portions. On the other hand, the intervention produces significant hormonal changes. By removing the gastric fundus, the area responsible for ghrelin production, the level of this hormone – the main appetite stimulator – drops considerably.

In parallel, the secretion of other hormones involved in the regulation of hunger and blood sugar, such as GLP-1 or PYY, changes. These changes contribute to better appetite control and more efficient use of energy from food.

In other words, after surgery, not only how much the patient eats changes, but also how the body reacts to food. This is precisely why bariatric surgery is increasingly defined as metabolic surgery, because it produces effects at the level of the entire organism.

Bariatric surgery and weight loss injections

In recent years, the treatment of obesity has been supplemented by the appearance of modern injectable drugs that act on gut hormones involved in appetite control. These therapies represent an important advance and can result in weight loss of approximately 15–20%.

However, in severe forms of obesity, bariatric surgery remains, on average, more effective. The intervention can result in a 25–35% decrease in body weight and has stronger effects on co-morbidities, especially type 2 diabetes.

Another important aspect is the stability of the results. In the case of drug treatments, the effects depend on long-term administration, and discontinuation of therapy may lead to regaining some of the lost weight. In contrast, surgery produces lasting and metabolic changes, which explains the more consistent results over time.

Why is it one of the most effective interventions?

Gastric sleeve surgery is considered one of the most effective bariatric interventions available today, as it offers an optimal balance between efficiency, safety and rapid recovery.

Studies show that patients lose, on average, 60 to 70 percent of their excess weight in the first one to two years after the procedure. This significant decrease does not only have an aesthetic impact, but above all a medical one.

In many cases, significant improvements or even remission of obesity-related conditions such as type 2 diabetes, high blood pressure or sleep apnea are observed. Thus, the benefits of the intervention go far beyond simple weight loss.

What changes in the body after surgery?

The effects of bariatric surgery are complex and manifest on many levels. After the intervention, the metabolism becomes more efficient and the body manages to use the glucose in the blood better, which contributes to the control of blood sugar.

At the same time, it decreases the chronic inflammation associated with obesity. Adipose tissue, especially abdominal fat, produces inflammatory substances that affect overall health. After weight loss and metabolic changes induced by surgery, the level of these inflammatory markers is significantly reduced.

There is also evidence that the intestinal bacterial flora changes after the intervention, which may further contribute to the regulation of metabolism. All these changes confirm that the effects are not just mechanical, but systemic.

Results after gastric sleeve

The results obtained after gastric sleeve surgery vary from one patient to another and depend on several factors, including compliance with medical recommendations and lifestyle changes.

In general, the most rapid weight loss occurs in the first year after the intervention, and thereafter the weight tends to stabilize. On average, patients lose between 60 and 70% of excess weight within two years.

It is essential to understand that the main goal of the intervention is not only to reduce the number of kilograms, but to decrease the metabolic and cardiovascular risks associated with obesity.

How weight loss injections have changed the outlook on obesity

The advent of injectable weight loss treatments has helped change the perception of obesity. For the first time, there are therapies that act directly on the biological mechanisms of appetite, which has highlighted the fact that obesity is not just a problem of willpower.

However, these treatments generally need to be followed long-term to maintain results and with close monitoring by a medical specialist. In the absence of continuity, there is a risk of returning to the initial weight.

A personalized approach to treatment

The modern treatment of obesity does not involve choosing a single solution, but building a plan adapted to each patient. Depending on the particularities of each case, it may include drug treatment, surgery, or a combination thereof.

Complete assessment and choosing the right strategy are essential to achieving sustainable results. Ultimately, the goal is not just to lose weight, but to improve your overall health and quality of life.

Article endorsed by Queen Mary