What Is a GLP-1 Weight-Loss Injection (Semaglutide)? A Toronto Physician Explains

GLP-1 receptor agonists have become one of the most discussed classes of medication in weight management, and semaglutide is one of them. This article explains, from a clinical perspective, how this class of medication works, its authorization status in Canada, and what a physician assesses when determining whether it is appropriate. Note: this article is health information, not medical advice. These are prescription medications. In Canada, the products authorized for type 2 diabetes and those authorized for long-term weight management are different products, under different brand names and dose strengths; the authorized indication is whatever the Health Canada product monograph states. Whether any of them is appropriate for you is a decision made by a physician after an in-person assessment.

What Exactly Is semaglutide (Semaglutide)?

semaglutide was developed by Danish pharmaceutical giant Novo Nordisk. It is a prescription medication; in Canada, different semaglutide products are authorized for type 2 diabetes or for long-term weight management, per their respective product monographs, and is one formulation of semaglutide. The drug belongs to a class known as GLP-1 receptor agonists, which mimic the action of the body’s naturally produced glucagon-like peptide-1 (GLP-1) hormone to control blood sugar and promote weight loss. One study looked at patients using semaglutide to treat type 2 diabetes. The results showed that patients treated with semaglutide lost an average of 5.6 kg after 16 weeks of treatment, with an average BMI reduction of 2.0. In addition, patients using semaglutide also experienced greater reductions in waist circumference and waist-to-hip ratio.

How Does semaglutide (Semaglutide) Help With Weight Loss?

You may be curious: “It’s a medication for treating type 2 diabetes – what does that have to do with weight loss?” Here’s how it helps people shed pounds. semaglutide’s main ingredient, semaglutide, mimics the action of the GLP-1 hormone, increasing insulin secretion and reducing glucagon secretion to control blood sugar levels. Beyond that, it can also slow gastrointestinal motility, increase feelings of fullness and reduce food intake. At the same time, it can promote the breakdown and burning of fat, thereby helping to reduce body weight. Semaglutide’s weight-reducing effect was discovered incidentally during research into its blood-sugar-lowering action. Although the mechanism is not yet fully understood, it is currently thought to work mainly through three pathways:

• Semaglutide can increase satiety signal levels in the arcuate nucleus of the hypothalamus and suppress increases in hunger signals, thereby enhancing feelings of fullness, reducing calorie intake and curbing appetite.
• Semaglutide can act on the gastrointestinal tract, delaying gastric emptying and gut motility, reducing gastric acid secretion, increasing satiety and reducing food intake.
• Semaglutide can act on central GLP-1 receptors, significantly reducing preference for and intake of high-fat or sweet foods, thereby altering food preferences, reducing calorie intake and achieving weight reduction.

This dual mechanism makes semaglutide an effective treatment for type 2 diabetes while also showing remarkable effects in treating obesity.

Who Is semaglutide (Semaglutide) Suitable For?

First, one point to be clear: semaglutide is essentially a glucose-lowering drug for people with type 2 diabetes, so patients with type 2 diabetes are naturally one of the suitable groups. However, if the goal is to lose weight through semaglutide injections, BMI is a relatively important measurement indicator. In a study called STEP 4, which included 803 patients with type 2 diabetes whose BMI was greater than or equal to 27, results showed that semaglutide could effectively promote weight loss and improve blood sugar control. Participants receiving semaglutide lost an average of 6.8% of their body weight, compared with only 2.3% in the placebo group. From these results, it is suitable for overweight adults with a BMI greater than or equal to 30 kg/m², or adults with a BMI greater than 27 kg/m² who have at least one weight-related condition (such as high blood pressure, type 2 diabetes or high cholesterol).

Who Is semaglutide (Semaglutide) Not Suitable For?

Certain groups need to take special care or should not use it. These groups include:

1. History of allergic reactions: If you have previously had an allergic reaction to semaglutide or other GLP-1 medications, you may not be suitable for semaglutide.
2. History of thyroid cancer: If you have thyroid cancer or a family history of thyroid cancer, you may not be suitable for semaglutide.
3. History of pancreatic disease: If you have pancreatitis, biliary disease or have had pancreatic surgery, you may not be suitable for semaglutide.
4. Pregnant and breastfeeding women: There is currently insufficient research data on the safety of semaglutide during pregnancy and breastfeeding, so it is not recommended for pregnant and breastfeeding women.

Side Effects of semaglutide (Semaglutide)

Although semaglutide performs well in treating type 2 diabetes and obesity, it can also cause some side effects. Common side effects include nausea, vomiting, diarrhea and headache. There may be some pain and redness during injection, but this usually resolves quickly.

Summary

In summary, as an effective treatment for type 2 diabetes and obesity, semaglutide can control blood sugar and promote weight loss by mimicking the action of the GLP-1 hormone. However, using semaglutide also requires attention to its possible side effects and to the groups for whom it is not suitable. Although semaglutide can promote weight loss, it is not a cure-all weight-loss drug. Using semaglutide for weight loss should be done under a doctor’s guidance, and combined with exercise and healthy eating habits to achieve better weight-loss results. In addition, semaglutide is not suitable for everyone and has certain contraindications, such as pregnancy, breastfeeding and impaired liver function, so you should consult a doctor and have the risks assessed before use. Related recommended reading: “Face-Slimming Injections” “Calf-Slimming Injections” “Shoulder-Slimming Injections” “Belkyra Fat-Dissolving Injections”