opinions on combined therapy, glp + metformin?

[Jfrick11]

To be clear, my position is that OP should do something, but that something would most likely be starting with either a GLP OR metformin rather than immediately jumping to both a GLP AND metformin at the same time, unless there's something unique about their situation that justifies dual treatment.

Not directly relevant to OP, but there's a separate mono-therapy VS dual-therapy debate/controversy within the endocrinology space in regards to what is best for treating new diabetics that I'll unpack here, since it's kind of interesting. Historically, a new diabetic was started on metformin alone, to see if lifestyle + metformin was sufficient treatment. Recently the ADA has published arguments from doctors suggesting that starting those patients on metformin + GLP (or SGLT2 or others) right off the bat makes more sense than metformin alone. I don't personally agree with their positions, but I understand why they're making them, since many (perhaps even most) diabetics don't find long-term resolution through metformin alone.

I think such doctors are committing a logical fallacy in advancing that position. It is based on the traditional approach to treating diabetes, which is to start with metformin and keep adding on additional other drugs as the disease progresses, which historically was a sensible way to treat diabetes. Those doctors are assuming a certain inevitability for diabetes that simple doesn't exist anymore with the advent of modern GLP drugs. By being trapped in the thinking that new drugs should be added rather than replaced, pharma benefits through more prescriptions being filled, but many patients will be taking a larger number of different drugs when a modern GLP might very well be sufficient on its own. Although in this case it's not a cash grab (nobody is getting rich off of metformin), but just "we've always done it this way" being mistakenly applied to clinical decision making by a large medical organization.

I actually think this is a much more reasonable take than some of the earlier replies, and I agree with parts of it.

I also don’t think everyone automatically needs combo therapy. GLP monotherapy is enough for many people.

My pushback is that combination therapy isn’t just an outdated “we’ve always done it this way” thinking. In someone his age, with his score and history of significant insulin resistance despite lifestyle efforts, I don’t think it’s irrational for a doctor to consider lower dose multi pathway treatments.
Whether that added benefit is meaningful enough in the OP’s case is the unknown and the real debate. Not whether the concept itself is irrational.

 

[Jfrick11]

If it's all about insulin resistance for her, then why call on a GLP1 anyway? Metformin, SGLT2 will work pretty well. Why is she bothering with GLP1?

Because the OP literally said they want to target both:
“using (small dose) Metformin to directly activate the AMPK pathway and target that cellular sensitivity + a small dose of a GLP so it can handle the hunger hormones.”

And also:
“I just want to give my body that little push so the machine can start working properly again.”

So this was never framed as insulin resistance only. They were specifically talking about addressing both metabolic signaling and appetite regulation.

 

[tubby]

I read your post just fine. 😉
You said insulin resistance “isn’t that relevant” to the decision because GLPs already improve it. My point was that the severity and nature of the OP’s insulin resistance is exactly why their doctor may still consider combination therapy reasonable instead of viewing every case as “just use the strongest GLP possible.”

That’s not me misunderstanding you.

That’s us disagreeing. 🙄

Also, reducing the discussion to “GLP fixes insulin resistance anyway” kind of ignores the entire nuance of why clinicians sometimes combine therapies that overlap mechanistically but act through different pathways, have different cost/access profiles, or allow lower dosing strategies.

And a Reddit analogy about garlic and antibiotics probably oversimplifies the situation more than my monologue did. 😂

Honestly, if I were in OP's shoes (who has successfully engaged in positive lifestyle habits), I might even consider leaning towards metformin initially rather than a GLP, given its longer and more established track record. I know it's heresy to say that on this board, but just being honest.

My concern would be a doctor jumping straight to a dual therapy is mindlessly following "guidelines" rather than objectively looking at OP's unique situation and trying to prescribe the minimum intervention necessary to accomplish a desired objective. It's possible there may be some complementary benefits one could rationalize with metformin + GLP (vs either alone), but unless there are major background details being left out of the OP, I struggle to imagine what those factors would be.

Either way, a fun subject to unpack.

 

[tubby]

I don’t think it’s irrational for a doctor to consider lower dose multi pathway treatments.
Whether that added benefit is meaningful enough in the OP’s case is the unknown and the real debate. Not whether the concept itself is irrational.

Agreed, but what would be the benefit of starting both now VS starting one now and another 6-months or a year later?

And I think that's a fairly universal principle. Does jumping the gun on prong number 2 (vs giving it a few months with just the first prong) really serve to benefit the patient, or is it revenue maximization for big pharma? I'd expect the latter to more frequently be the case than the former.

 

[Jfrick11]

Honestly, if I were in OP's shoes (who has successfully engaged in positive lifestyle habits), I might even consider leaning towards metformin initially rather than a GLP, given its longer and more established track record. I know it's heresy to say that on this board, but just being honest.

My concern would be a doctor jumping straight to a dual therapy is mindlessly following "guidelines" rather than objectively looking at OP's unique situation and trying to prescribe the minimum intervention necessary to accomplish a desired objective. It's possible there may be some complementary benefits one could rationalize with metformin + GLP (vs either alone), but unless there are major background details being left out of the OP, I struggle to imagine what those factors would be.

Either way, a fun subject to unpack.

I 💯 agree with the principle of not escalating treatment unnecessarily.
I think where people differ is in how concerning they view a HOMA of 7.9 in a 23year-old who already appears highly adherent and has still struggled to achieve meaningful body comp change despite improving biomarkers.
Some clinicians would see that and think:
“Start conservatively with metformin and lifestyle.”
Others would think:
“This is significant insulin resistance early in life.... intervene more proactively while the metabolic system is still very recoverable.”
And honestly, neither perspective is completely irrational to me.

 

[Jfrick11]

Agreed, but what would be the benefit of starting both now VS starting one now and another 6-months or a year later?

And I think that's a fairly universal principle. Does jumping the gun on prong number 2 (vs giving it a few months with just the first prong) really serve to benefit the patient, or is it revenue maximization for big pharma? I'd expect the latter to more frequently be the case than the former.

Fair question and in many cases, there may not be much advantage to starting both immediately instead of sequencing them and reassessing later.

I just think it gets more nuanced in someone young with significant insulin resistance who’s already shown strong lifestyle adherence without touching the sensitivity.

And while pharma influence is definitely real, I'm not sure metformin.....a dirt cheap generic...is the strongest example of "revenue maximization". If anything, most of the financial incentive in this space points the opposite direction.

 

[Cluni0n]

Update: I had my doctor’s appointment a few days ago and here's her clinical breakdown about me
Hey everyone, thank you all for the insights on my previous post. We are actually taking a different route, and I wanted to share exactly what she explained to me point by point, just in case anyone's curious:

Here is her clinical breakdown of my case:

• HOMA-IR is not a definitive diagnostic tool: She explained that HOMA is just a mathematical snapshot of a single moment in time. Insulin fluctuates constantly, and lab measurements can vary wildly depending on where you get tested (it isn't standarized accross labs). A high HOMA score naturally happens when you carry extra weight, but it doesn't automatically mean you have clinical, systemic insulin resistance if the rest of your metabolic markers are perfect, She also mentioned something about how it has shown in studies that it isn't even truly correlated with the actual diagnostic "gold standard" (the euglycemic clamp), but yeah maybe that's too technical lol.
• The "Extra Effort" concept: She looked at my whole picture: clean liver/the abdominal ultrasound where everything was okay/healthy, normal A1C, optimal lipids, and fasting glucose of 88. She told me sth like my isolated high HOMA-IR is basically just a reflection of the "extra effort" my body has to make to handle glucose through my current volume of adipose tissue, not a systemic failure of my organs. I am actually metabolically healthy.
• Why we are skipping Metformin: I originally "considered" (I was just curious) Metformin strictly to heal the insulin resistance, not for weight loss. However, she explained it simply isn't necessary in my case because I don't have a fatty liver or other typical clinical markers to diagnose systemic IR. My body already responded beautifully (her words lol) to my lifestyle changes and supplements (Berberine + Inositol), and the proof is in my labs:
  • Sept 2025: Fasting Glucose 99, A1C 5.1, Total Cholesterol 171, Triglycerides 162.
  • May 2026: Fasting Glucose 88, A1C 5.1, Total Cholesterol 120, Triglycerides 87. With my baseline this optimized, adding Metformin to target insulin resistance would be redundant (buuut, in other cases the microdose of metformin + glp can help a looot).
• She prescribed a low dose of an injectable (Mounjaro). Her logic is that my body just needs the right pharmacological "push" to wake up the fat-loss process that got locked up by my past cortisol/antidepressant issues. As the adipose tissue shrinks thanks to the medication, the insulin resistance will naturally resolve itself along the way.

Thanks again to everyone who shared their opinions, it's definitely an interesting topic to talk about 🙂 Really excited to finally start this next phase!
**Even tho mounjaro was prescribed, I feeeeeeeel that maaaaaybe I will give Reta a try hehe

 

[tubby]

Sounds to me like your doctor made the right call on that one (obviously I'm going to say that since it was my position too 🤣 ).

To correct a couple of things:

HOMA-IR is not a definitive diagnostic tool: [...] clinical, systemic insulin resistance [...] actual diagnostic "gold standard" (the euglycemic clamp).

The euglycemic clamp is a red herring. That lab is never realistically getting ordered for you unless you find yourself participating in a clinical study someday. She's trying to sidestep having to explain to you that she lacks a protocol from a major medical association to act on a "bad" HOMA-IR score. Contrary to what House MD may lead people to believe, most PCPs aren't in the business of "winging it," when it comes to medical care.

She looked at my whole picture: clean liver/the abdominal ultrasound where everything was okay/healthy, normal A1C, optimal lipids, and fasting glucose of 88. She told me sth like my isolated high HOMA-IR is basically just a reflection of the "extra effort" my body has to make to handle glucose through my current volume of adipose tissue, not a systemic failure of my organs. I am actually metabolically healthy.

She acknowledges that you're concerned by the result, but the American Diabetes Association (or whatever the equivalent in Chile is) hasn't yet transitions to an approach where insulin resistance is proactively treated based on fasted insulin or HOMA-IR scores. And financial considerations of major donors make it unlikely the ADA would really want to do that. She's not going to wing it, but that's okay because she knows her overall treatment decision (Mounjaro) will resolve your concern anyway so it's kind of a moot point. She's proactively trying to avoid you obsessively tracking HOMA-IR instead of her preferred clinical markers to minimize the need to have to redirect you in the future.

I originally "considered" (I was just curious) Metformin strictly to heal the insulin resistance, not for weight loss. However, she explained it simply isn't necessary in my case because I don't have a fatty liver or other typical clinical markers to diagnose systemic IR. My body already responded beautifully (her words lol) to my lifestyle changes and supplements (Berberine + Inositol), and the proof is in my labs:

There's no such thing as "healing" insulin resistance (just as you can't "heal" obesity), but there is such a thing as reducing it. Since you mentioned berberine she's probably recognizing that you're already taking something very metformin-like and stacking metformin on top of that is going to be overkill for your present situation.

Nice work on those labs so far, by the way!

 

[HereKittyKitty]

Having taken Metformin for nearly 2 years, be aware it can cause significant gastric distress. I lost 65# while taking it as a result of chronic nausea.