GLP-1 FOR WEIGHT LOSS

What is GLP-1?

GLP-1 stands for glucagon-like peptide-1, a hormone your gut releases after eating. It does three useful things at once: it signals fullness to the brain, slows how quickly the stomach empties, and helps the pancreas release insulin when blood sugar rises.

GLP-1 receptor agonists are medicines that mimic this hormone but last far longer in the body — which is why most are taken once a week rather than after every meal.

How GLP-1 medicines cause weight loss

The effect is mostly on appetite rather than metabolism. Patients consistently describe the same thing: the constant mental background noise about food quietens down. Portions that once felt inadequate now feel like enough.

Because the stomach empties more slowly, fullness also lasts longer after meals. Combined, this makes a calorie deficit achievable without the daily willpower battle that defeats most diets.

Who is eligible?

Prescribing follows established criteria rather than preference. Broadly, GLP-1 treatment is considered for adults with a BMI of 30 or above, or a BMI of 27 or above alongside a weight-related condition such as type 2 diabetes, high blood pressure, sleep apnoea or fatty liver.

Your doctor will also review your medical and family history. Certain conditions — including a personal or family history of medullary thyroid carcinoma or MEN2 syndrome, pancreatitis, and pregnancy — rule these medicines out.

What results are realistic?

Published clinical trials of GLP-1 and dual-agonist medicines have reported average total body weight reductions in the region of 15% to 20% over 60 to 72 weeks, when combined with diet and activity support.

Averages are not promises. Response varies considerably between individuals, and results depend heavily on dose tolerance, nutrition and how consistently the programme is followed.

The dose ladder

Treatment never starts at the full dose. You begin low and step up gradually at review appointments, usually over several months. This is the single most important factor in tolerating the medicine well.

Rushing the ladder is the most common reason patients abandon treatment. Nausea is far more manageable when the increase is gradual and supervised.

What happens if you stop

Appetite returns when the medicine is withdrawn, and weight regain is common if eating patterns have not changed. This is not a failure of the drug; it reflects that obesity is a chronic condition rather than a short course of treatment.

This is why our programmes pair the medicine with dietitian support and behaviour coaching from day one, and why we plan discontinuation deliberately rather than stopping abruptly.

What your first appointment covers

The consultation is a clinical assessment, not a sales conversation. Expect questions about your weight history from childhood onwards, every diet you have attempted and what happened, your current medications and supplements, family history of diabetes and thyroid disease, and any symptoms suggesting sleep apnoea or reflux.

Baseline blood work typically covers HbA1c or fasting glucose, thyroid function, liver function, lipid profile, kidney function and vitamin D and B12. These establish a starting point and rule out conditions that would make treatment unsafe.

You should leave the appointment knowing whether treatment is appropriate, what it will cost, what the schedule looks like and what happens if it does not suit you.

How GLP-1 compares with older weight loss drugs

Earlier generations of weight loss medication largely worked by suppressing the central nervous system or blocking fat absorption. Several were withdrawn over cardiovascular or psychiatric safety concerns, and effectiveness was modest.

GLP-1 medicines work through a physiological pathway the body already uses, which is why the effect sizes are substantially larger and the safety profile better characterised. They are not appetite suppressants in the older sense; they restore a satiety signal.

Beyond weight: the metabolic effects

Reductions in HbA1c, blood pressure and triglycerides are commonly seen alongside weight loss. For patients with fatty liver disease, improvements in liver markers are frequently reported.

Some patients notice improved sleep quality as apnoea eases, less joint pain as load reduces, and improved mobility. These often matter more day to day than the number on the scale.

Frequently asked questions