-
This forum is for informational purposes only and does not provide medical advice. Read our Medical Disclaimer. | Privacy | Terms | About | Cookie Policy | Editorial Policy | This site may contain sponsored content and affiliate links.
GLP-1s eating your muscle?
- Thread starter SunnyCookie
- Start date
lanky-newbietoo8712
Active member
The yearly DEXA cadence is the gold standard for answering the muscle loss question over a GLP-1 run. Bone density tracking alongside the composition data is the underrated benefit - people losing significant weight sometimes see bone density changes that the scale hides entirely. 150 lbs off over 4 years with the data to show what happened to lean mass is the kind of longitudinal picture most people don't have.
bored-smoothie2614
Member
Glycine doesn't interfere with how well semaglutide works. If anything it may help offset muscle loss. Wouldn't stress over it.
curious-peach39
Member
Went with a DEXA scan for this. Female here.
Wrapped up a cut back in January at 10% body fat, 136 pounds.
Over the following six months bumped calories up by roughly 800 and cut cardio from around 3 hours down to 1.5-2. Just got another DEXA done and it's showing 14% body fat, weighing slightly less at 133, but the drop looks like it came purely from muscle. Genuinely can't figure out how that happened.
Wrapped up a cut back in January at 10% body fat, 136 pounds.
Over the following six months bumped calories up by roughly 800 and cut cardio from around 3 hours down to 1.5-2. Just got another DEXA done and it's showing 14% body fat, weighing slightly less at 133, but the drop looks like it came purely from muscle. Genuinely can't figure out how that happened.
Compound_Goals
Well-known member
Just went through this with my new doctor. Kidney function reading came back at 85, so he suggested running a different kidney marker test, which showed 87 instead. Currently taking 5 grams of creatine daily.
Light_Life
Well-known member
Love how people frame it like naturally losing weight through diet and exercise costs you a quarter of your muscle, while GLPs somehow cost half. Obviously that's backwards, same thing happens losing weight through diet alone without exercise. Don't blame the medication, blame skipping the workouts.
basil_tinkertbh
Well-known member
Been a taurine fan long before this became relevant, pairing it with glycine at bedtime feels amazing. Also some evidence it works a bit like creatine for preventing muscle loss during a cut.
Not ruling anything out. Found way more people matching my symptoms with gallbladder trouble than pancreas trouble.
Also think we're picturing the spot differently. Straight ahead is 12 for me, spine side is 6. Picture my navel as center, pain sits right of that a few inches.
Doing better functionally staying consistent with breakfast and taking TUDCA. Attacks and random aches stopped, things run more solid now too.
Smoking and heavy copper intake were real culprits. Dropping my reta dose helped too, wasn't the original reason though. Staying lean apparently beats organ happiness, joking aside.
Not ruling anything out. Found way more people matching my symptoms with gallbladder trouble than pancreas trouble.
Also think we're picturing the spot differently. Straight ahead is 12 for me, spine side is 6. Picture my navel as center, pain sits right of that a few inches.
Doing better functionally staying consistent with breakfast and taking TUDCA. Attacks and random aches stopped, things run more solid now too.
Smoking and heavy copper intake were real culprits. Dropping my reta dose helped too, wasn't the original reason though. Staying lean apparently beats organ happiness, joking aside.
calm_mixerog
Active member
Wouldn't stress about muscle loss, honestly that concern gets massively exaggerated by people against glp1s. Sure, some muscle goes when anyone loses weight, but what those scans actually capture is 'lean mass' loss - that label really refers to anything that isn't fat, so it counts glycogen and the water your liver and muscles hold onto. Lose one glycogen molecule, you drag 4-5 water molecules along with it. And there it is, the scan shows less 'fat-free mass' or 'lean mass.' In plain terms that word gets read as 'muscle,' so the anti-glp1 crowd ran with it and even claimed bone loss too. Lifting weights at all mitigates most of that. This medication exists for people where diet and exercise alone weren't cutting it, and while it's technically possible to achieve the same result without meds, some of us would need such extreme dieting and exercise that weight maintenance would become a punishing full-time job. Could be a solid option if your doctor's on board. Got a DEXA scan done and brought results to mine, she agreed to prescribe even with my BMI sitting at only 27. Body fat was over 43 percent though.
Those early claims about GLP-1s causing severe muscle loss look overstated, mostly because standard scans like DEXA lump intramuscular fat in with total muscle mass.
Compounds such as tirzepatide and reta have actually been shown in studies to specifically cut down that muscle marbling, meaning the intramuscular fat itself, rather than muscle tissue overall. There's research on this worth digging into.
Compounds such as tirzepatide and reta have actually been shown in studies to specifically cut down that muscle marbling, meaning the intramuscular fat itself, rather than muscle tissue overall. There's research on this worth digging into.
Good callout, glad you raised it. Threads like this matter since nuance tends to get flattened in a quick reply.
You're correct that reduced lean tissue shows up regardless of which drug class is involved. Cutting calories hard enough, whether through dieting, surgical intervention, or medication, always costs some muscle along the way. Nothing controversial there.
What I meant to convey was a slightly different angle. Appetite gets dialed down so aggressively on these medications that plenty of users, particularly older folks, end up quietly under-hitting their protein target. That's when the expected muscle loss tied to any weight drop turns into something worth watching more closely. Follow-up work building on the STEP research has pointed toward exactly that pattern.
So my claim isn't that the medication itself eats muscle directly. It's that it sets up conditions where skipping protein becomes easy to do without noticing, and that raises the stakes. Should've framed that more precisely the first go-round.
On the bot accusation, for context I spent two decades practicing as a pharmacist and put in six years studying nutrition science. Still, fair criticism, my phrasing could've landed cleaner. I'd rather add clarity now than leave room for confusion.
Genuinely curious ab
You're correct that reduced lean tissue shows up regardless of which drug class is involved. Cutting calories hard enough, whether through dieting, surgical intervention, or medication, always costs some muscle along the way. Nothing controversial there.
What I meant to convey was a slightly different angle. Appetite gets dialed down so aggressively on these medications that plenty of users, particularly older folks, end up quietly under-hitting their protein target. That's when the expected muscle loss tied to any weight drop turns into something worth watching more closely. Follow-up work building on the STEP research has pointed toward exactly that pattern.
So my claim isn't that the medication itself eats muscle directly. It's that it sets up conditions where skipping protein becomes easy to do without noticing, and that raises the stakes. Should've framed that more precisely the first go-round.
On the bot accusation, for context I spent two decades practicing as a pharmacist and put in six years studying nutrition science. Still, fair criticism, my phrasing could've landed cleaner. I'd rather add clarity now than leave room for confusion.
Genuinely curious ab
jolly_midjourney69
Member
Lost 44 pounds and this time actually kept my muscle mass intact while on the dual-action compound, after botching things badly the first go-round on the single-pathway one where the pounds fell fast but a large share of that loss turned out to be lean tissue. What changed the outcome was treating protein like a hard daily quota (aiming somewhere in the 70-to-100-gram range) combined with genuinely lifting weights. Quick rundown of what helped:
1. Timing carries more weight with this drug class than people expect. These meds delay stomach emptying, so cramming protein into one evening meal just doesn't work, you're stuffed almost immediately. I switched over to smaller meals spread throughout the day instead, something pre-workout, a shake around noon, and front-loaded most of my protein while my appetite still allowed it.
2. Which protein source you pick matters far less than simply reaching your number. I personally used a plant-based shake, mostly because digestion tolerance pushed me that direction given how slow things already move. Can't compare it head to head against a dairy-based option from experience, but everything I've read suggests both preserve muscle about equally well provided the total grams line up. The real deciding factor in my case came down to the resistance training, not the protein choice.
3. The bottleneck was never absorption, it was appetite. This drug class doesn't interfere with protein absorption itself, it just kills the desire to eat, meaning whole-food protein becomes genuinely
1. Timing carries more weight with this drug class than people expect. These meds delay stomach emptying, so cramming protein into one evening meal just doesn't work, you're stuffed almost immediately. I switched over to smaller meals spread throughout the day instead, something pre-workout, a shake around noon, and front-loaded most of my protein while my appetite still allowed it.
2. Which protein source you pick matters far less than simply reaching your number. I personally used a plant-based shake, mostly because digestion tolerance pushed me that direction given how slow things already move. Can't compare it head to head against a dairy-based option from experience, but everything I've read suggests both preserve muscle about equally well provided the total grams line up. The real deciding factor in my case came down to the resistance training, not the protein choice.
3. The bottleneck was never absorption, it was appetite. This drug class doesn't interfere with protein absorption itself, it just kills the desire to eat, meaning whole-food protein becomes genuinely
basil_dabbler
Member
Tell me you're either an automated account or genuinely clueless on the basics.
There's no credible research proving muscle loss happens purely because of this drug class.
Muscle loss tracks with how fast the weight comes off. Full stop.
Blaming the medication when someone can't manage a gradual deficit, control their loss rate, or hit basic protein and fat targets relative to bodyweight is nothing short of ignorance.
Claiming to be a nutritionist makes posting something like this even worse for your credibility.
Honestly though, leaning toward thinking you're an automated account regardless.
There's no credible research proving muscle loss happens purely because of this drug class.
Muscle loss tracks with how fast the weight comes off. Full stop.
Blaming the medication when someone can't manage a gradual deficit, control their loss rate, or hit basic protein and fat targets relative to bodyweight is nothing short of ignorance.
Claiming to be a nutritionist makes posting something like this even worse for your credibility.
Honestly though, leaning toward thinking you're an automated account regardless.