How Do Glucagon-like Peptide-1 Agonists Work for Weight Loss?

HOW DO GLUCAGON-LIKE PEPTIDE-1 AGONISTS WORK FOR WEIGHT LOSS?

GLP-1 receptor agonists (glucagon-like peptide-1 agonists) for obesity are a class of medications used for chronic weight management in adults and pediatric patients who are overweight or have obesity. These drugs mimic the action of a naturally occurring hormone called GLP-1, which is released from the intestines in response to food intake. While originally developed to treat type 2 diabetes, GLP-1 agonists have been found to be highly effective for weight loss. They work by targeting areas of the brain (the hypothalamus) that regulate appetite and food intake. By activating GLP-1 receptors, these medications:

• Increase Satiety: They signal to the brain that the body is full, leading to a decrease in calorie intake.
• Reduce Appetite: They decrease hunger cravings and "food noise" (persistent thoughts about food).
• Slow Gastric Emptying: They slow down the rate at which food leaves the stomach, which helps patients feel fuller for longer periods after eating.
• Regulate Insulin: Though used here for weight, they also help the pancreas release the right amount of insulin when blood sugar levels are high.

HOW ARE GLP-1 AGONISTS FOR WEIGHT LOSS USED?

GLP-1 agonists for obesity are indicated for chronic weight management in:

• Adults with a body mass index (BMI) of 30 kg/m² or greater (obesity).
• Adults with a BMI of 27 kg/m² or greater (overweight) who also have at least one weight-related condition, such as high blood pressure, type 2 diabetes, or high cholesterol.
• Pediatric patients (aged 12 and older) with an initial BMI at the 95th percentile or greater for age and sex (obesity).

These medications are intended for use in conjunction with a reduced-calorie diet and increased physical activity. They are typically administered as once-weekly or once-daily subcutaneous injections in the abdomen, thigh, or upper arm.

WHAT ARE SIDE EFFECTS OF GLP-1 AGONISTS FOR WEIGHT LOSS?

The most common side effects associated with GLP-1 agonists are gastrointestinal in nature. These symptoms are often most prominent when starting the medication or increasing the dose. Common side effects include:

• Nausea
• Diarrhea
• Vomiting
• Constipation
• Abdominal pain
• Fatigue
• Dizziness
• Dyspepsia (indigestion)

Serious but rare side effects may include:

• Pancreatitis: Inflammation of the pancreas.
• Gallbladder problems: Including gallstones or cholecystitis.
• Kidney injury: Often resulting from dehydration caused by severe gastrointestinal side effects.
• Increased heart rate: Palpitations.
• Suicidal behavior or ideation: Patients should be monitored for mood changes.
• Risk of Thyroid C-cell Tumors: In animal studies, these drugs caused thyroid tumors; it is unknown if they do so in humans. They are contraindicated in patients with a personal or family history of Medullary Thyroid Carcinoma (MTC).
• Pulmonary Aspiration: A risk during deep sedation or general anesthesia due to delayed gastric emptying.

WHAT ARE NAMES OF GLP-1 AGONISTS FOR WEIGHT LOSS?

While many GLP-1 drugs exist for diabetes, only specific brands and formulations are FDA-approved specifically for the treatment of obesity: Generic and Brand Names: Semaglutide (Wegovy): A once-weekly injection or once-daily oral tablet. (Note: Ozempic is the brand name for semaglutide approved for diabetes). Liraglutide (Saxenda): A once-daily injection. (Note: Victoza is the brand name for liraglutide approved for diabetes). Tirzepatide (Zepbound): A once-weekly injection that targets both GLP-1 and GIP (glucose-dependent insulinotropic polypeptide) receptors. (Note: Mounjaro is the brand name for tirzepatide approved for diabetes). Orforglipron (Foundayo): A once-daily oral tablet. Warning: These medications should not be used in combination with other GLP-1 receptor agonist products or products intended for weight loss including prescriptions, over-the-counter drugs, or herbal products.