Burning Fat, Not Just Eating Less: A Chattanooga Physician on GLP-1/Glucagon Drugs

I am Dr. Paul Miranda, a board-certified physician at Summit Metabolic Health. I read every patient chart myself. When patients hear about a drug that “burns fat instead of muscle,” they get excited — and they should understand it clearly, because the principle behind it is something I already build into every plan I write.

Adding Glucagon: The GLP-1/Glucagon Fat-Burning Idea

A GLP-1 medication works mainly on appetite — it makes you feel full sooner and less preoccupied with food. Pemvidutide adds a second hormone to that signal: glucagon. In this balanced GLP-1/glucagon design, the GLP-1 side still curbs appetite, while the glucagon side raises energy expenditure and pushes the body to oxidize — to burn — stored fat, particularly in the liver (Altimmune MOMENTUM Phase 2 program; pemvidutide clinical development, PMID 39002641). In plain terms: one lever eats less, the other lever spends more.

That combination matters for a problem every honest weight-loss doctor worries about. When you lose weight quickly, some of what you lose is muscle, not just fat. The hope with a glucagon-driven drug is that it preferentially mobilizes fat — protecting more of your lean muscle along the way.

What the Early Data Actually Show

In its Phase 2 obesity trial (MOMENTUM), the highest dose of pemvidutide was associated with about 15.6 percent average weight loss at 48 weeks, versus about 2.2 percent on placebo — and the weight curve had not flattened out at the end of the study. The headline that got researchers’ attention was the body-composition breakdown: roughly 78 percent of the weight lost came from fat and about 22 percent from lean mass, which the manufacturer describes as favorable muscle preservation. In a separate Phase 2b study in metabolic liver disease, pemvidutide resolved the liver condition in about 52 to 58 percent of patients versus 20 percent on placebo (IMPACT trial, Lancet 2025, PMID 41237796). Trial averages, not guarantees — individual results vary.

The Real Lesson: The Quality of Your Weight Loss Matters

Whether or not pemvidutide ever reaches a pharmacy, it has already made a point I make to patients every week in Chattanooga: how much you weigh is only half the story. What that weight is made of — fat versus muscle — is the other half. Muscle is your metabolic engine. Lose too much of it, and you become someone who is lighter but weaker, with a slower metabolism that makes regaining weight easier. That is not a win.

Here is the part the drug companies cannot patent: you do not need an experimental glucagon drug to protect your muscle while you lose fat. We already know how to do it. It just requires a physician who is paying attention to more than the scale.

What I Do for Patients at Summit Today

At Summit Metabolic Health, “muscle-sparing fat loss” is not a future promise — it is how I run every plan. I use the proven, FDA-approved medications available now, and I surround them with the things that protect your lean mass while the fat comes off.

This is exactly where a physician-led program and a telehealth refill mill part ways. A questionnaire scored by software hands out a dose and never asks what your weight is made of. It does not set your protein target, program resistance training, or slow your titration so the loss stays fat and not muscle. That attention is the whole point — and it is why I read every chart at Summit myself before anyone gets a plan.

And because Summit builds an exit strategy into every plan — reach your goal weight, then taper the medication in a controlled way — the muscle you protected and the fat you lost are meant to last. It is also the program designed to get cheaper as you get healthier.

The Bottom Line for Chattanooga

GLP-1/glucagon drugs like pemvidutide point to an important truth: the goal was never just a smaller number, it was losing fat while keeping the muscle that keeps you strong and your metabolism healthy. That is genuinely exciting science — but it is investigational and years away. The good news is that the strategy behind it is available in Tennessee today, with a physician who tracks what your weight is actually made of.

You can apply in about five minutes at summitmetabolichealth.com/apply. I personally review every application and reach out — no algorithms, no sales calls.