GLP-1s Explained: Benefits, Risks, and the Weight Loss Buzz

GLP-1 stands for glucagon-like peptide-1, a hormone and peptide that naturally occurs in the body and is produced in the gut. It helps regulate blood sugar, appetite, insulin release, and digestion. GLP-1 medications are designed to mimic the body's natural GLP-1 response, and they were originally developed for type 2 diabetes management before becoming widely used for weight management.

Ozempic is also known as semaglutide, the first-generation GLP-1, and it acts on the GLP-1 receptor only. Tirzepatide (also sold as Zepbound and Mounjaro) acts on two pathways, GLP-1 and GIP, so it is considered a second generation. In Colin Renaud's experience tirzepatide can mean fewer side effects for some people and has been more heavily studied in micro-dosing, though clinician preference and insurance coverage also factor into which one a provider recommends.

There is a known potential for muscle loss with all GLP-1 medications, which is why the providers discuss muscle preservation with every patient. The research they reference suggests that the muscle lost early in significant weight loss is often striated with fat rather than healthy muscle, and that the loss should plateau as you approach your ideal weight. Adequate protein intake, matched to your body weight, plus resistance training, is the main way to protect healthy muscle.

No. While they are widely used for weight management and were originally developed for type 2 diabetes, the providers describe using GLP-1s at very small micro doses for their anti-inflammatory effects in complex chronic conditions like mast cell activation syndrome, POTS, chronic Lyme, and chronic fatigue. Researchers are also studying GLP-1s for addictive behavior and long-haul COVID because of their effect on brain chemistry, not just the gut.

The most common side effects affect the digestive system, primarily nausea and constipation, and higher doses tend to carry a higher risk. Everyone differs in sensitivity. The providers note that significant bowel disturbance often signals that something needs adjusting, such as the dose being too high or inadequate calories or protein, rather than simply masking the symptom with a laxative.

The evaluation starts at the first visit with a comprehensive lab panel of over 100 biomarkers (including fasting glucose, fasting insulin, hemoglobin A1C, a lipid panel, liver enzymes, a full thyroid panel, inflammatory markers, nutrient levels, hormones, and kidney function) plus an InBody body composition scan. The providers look for root causes of weight gain across diet, hormones, sleep, stress, and the gut, then build a personalized plan. A GLP-1 is used as one tool within that plan, with ongoing labs and support roughly every three months, not as a standalone prescription.