Nutrition & Diet Plans

Inside GLP-1 The science behind the weight loss revolution

Dr. Saptarshi Bhattacharya

Dr. Saptarshi Bhattacharya

Chief medical advisor ,Voy India

Last Updated 19 June 2026

Inside GLP-1 The science behind the weight loss revolution

Let us first understand what GLP-1 is?

Your Body Already Makes It

GLP-1, or glucagon-like peptide-1, is a hormone your body produces naturally. It's released by specialised cells in your small intestine called L cells, every time you eat. The moment it's released, it tells your brain you're full, prompts your pancreas to release insulin, slows down how quickly food leaves your stomach, and kicks off the chain of events your body needs to properly digest food, manage blood sugar, and store fat.

It’s one of the most important hormones involved in how your body responds to food.

So What Happens When It Doesn't Work Properly?

For many people, this signal is weaker than it should be. The message "you're full, stop eating" either doesn't come through clearly or fades too quickly. A couple ways that this can show up as are:

  • Feeling hungry again shortly after a full meal
  • Difficulty feeling satisfied, regardless of what you eat
  • Blood sugar fluctuations that affect energy and mood

And since these are such everyday issues, we usually don’t take them seriously, but it’s very important to listen to the signs that our body regularly keeps telling us.

What Is a GLP-1 Receptor Agonist?

A GLP-1 receptor agonist is a medication designed to mimic the action of your body's natural GLP-1 hormone, but more effectively and for longer. Your body already knows how to do all of this. The medication simply helps it do it better. Think of it less like introducing something foreign, and more like giving an existing system the support it needs to function the way it was always meant to.

How do GLP-1 medicines help in weight loss?

These medicines act exactly like the hormone present in your body, hence they perform these functions and help better:

  • Regulating insulin secretion: The pancreas is prompted to release insulin at exactly the right moment, when blood sugar rises after a meal. This precise response prevents spikes and crashes that often trigger hunger and overeating.
  • Reduced glucagon secretion: Glucagon, the hormone that signals the liver to dump glucose into the bloodstream, is kept at bay. The result is a steadier internal environment where your body is not constantly reacting to fluctuating energy levels.
  • Delayed gastric emptying: Food moves through the stomach at a slower pace, extending the window during which you feel satisfied. Smaller portions become more manageable, naturally.
  • Appetite suppression: Hunger is not just about the stomach, it is driven by specific receptors in the brain. GLP-1 medicines act directly on these receptors, reducing the neurological urge to eat even before you feel physically hungry.

Real-world effects of GLP-1s

Clinical trials have shown remarkable outcomes:

  • A 68-week randomized clinical trial, published in the New England Journal of Medicine, found that participants taking Semaglutide (Wegovy) achieved an average weight loss of 14.9% of their body weight.
  • Similarly, a 72-week study known as the SURMOUNT-1 trial, also published in NEJM, showed that individuals treated with Tirzepatide (Zepbound) experienced an average weight loss of up to 20.9%.

This is critical for those suffering from health complications alongside obesity.

Beyond Weight Loss: The Broader Health Benefits of GLP

Weight loss is often just the beginning. For many individuals on a GLP-1 programme, the improvements they notice extend well into other areas of their health .

  • A Healthier Heart: GLP-1 medicines have demonstrated a consistent ability to bring down both blood pressure and cholesterol levels. For urban Indians, where cardiovascular risk is rising at an alarming rate, this is a significant added advantage of the treatment.
  • A Stronger Defence Against Diabetes Even for those who have not yet developed Type 2 diabetes, GLP-1 medicines offer meaningful protection. By improving how sensitively the body responds to insulin, they help prevent the disease from taking hold in the first place.
  • Reduced Cancer Risk Research increasingly points to obesity as a contributing factor in several types of cancer. By addressing excess weight at a metabolic level, GLP-1 programmes may help lower that risk over the long term, a benefit that goes far beyond aesthetics.
  • Fewer Doors Open for Disease Obesity does not act alone, it is a gateway condition that raises the likelihood of a wide range of serious health problems. Tackling it effectively through a GLP-1 programme means systematically reducing exposure to many of those downstream risks, giving the body a far better foundation for long-term health.

What to expect when on GLP-1 ?

GLP-1 can come with side effects like most medications. The most common side effects consist of nausea, vomiting, diarrhea, and constipation. Rarest of the rare cases of some individuals who had underlying conditions have experienced pancreatitis, gall bladder diseases and kidney diseases. To determine what is suitable for you, it is essential to consult with a medical professional, such as endocrinologists who are super specialist doctors, specializing in metabolic conditions.

So, all you need to do is take this medicine and it will work? NO

As effective as GLP-1 medicines are, they work best when paired with the right habits. The medicine creates the conditions for weight loss, but what you do alongside it determines how far you go.

What You Eat Still Matters: GLP-1 reduces appetite, but it does not choose what goes on your plate. A diet built around whole foods, adequate protein, healthy fats, and essential micronutrients gives your body the raw material it needs to lose fat, preserve muscle, and feel lighter.

Movement Accelerates Everything: Regular physical activity, whether that is structured workouts, evening runs, or being more active through the day, works in sync with GLP-1 to improve metabolism, support cardiovascular health, and sustain the results you work towards.

Think of GLP-1 as a powerful tool, not a complete solution. The individuals who see the most lasting change are those who use it as a foundation to build better habits on, not a shortcut around them.


Are You Curious?

Do you think GLP-1 drugs can help you achieve your desired weight loss goals? Sign up today to book a one-on-one session with top coaches equipped to give you tailored advice aligned with your health goals.

Disclaimer: GLP-1 medications should only be taken under the guidance of a qualified healthcare professional. At Voy, we strongly advise against the use of any GLP-1 therapy without proper medical consultation, as unsupervised use may lead to adverse side effects or health complications.

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FAQ

Dr. Saptarshi Bhattacharya

Medically reviewed by Dr. Saptarshi Bhattacharya, Chief Medical Advisor

What is GLP-1 medication?

GLP-1 is a natural hormone produced in the human body that helps regulate appetite, blood sugar, and metabolism. GLP-1 medications mimic this hormone to reduce hunger, improve insulin response, and support sustainable weight loss. Learn more

How much weight loss can I expect?

Everybody is unique, so results will vary. Clinical research on GLP-1 therapies has reported a range of outcomes; individual results vary. Your dedicated care team will personalise your plan to help you achieve sustainable progress. Learn more

What happens when I stop the medication?

Your natural appetite signals will return, which is why our programme is built for lasting independence. We prevent relapse with a two-part plan: your doctor creates a medically guided tapering schedule (not an abrupt stop), while your nutritionist helps you build sustainable habits to maintain your results long-term. Learn more

Am I eligible for GLP-1 medication?

Eligibility is a medical decision made by your Voy doctor. It is determined after a comprehensive evaluation, which includes an at-home blood test and a one-on-one consultation with a specialist endocrinologist. They will review your full health profile to see if GLP-1 therapy or another path is right for you. Learn more

Is the program safe?

When prescribed and supervised by our medical team, treatment follows clinical guidelines. Your safety is our priority, which is why every user's journey is overseen by a qualified endocrinologist to ensure care is appropriate for your health needs and to monitor your progress closely. Learn more

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