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I’m confused why GLP-1 medicines reduce appetite but also slow stomach emptying—is that separate?
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Discussion 21

hungryagain @hungryagain ·
could the distinction be that the stomach-emptying effect often shows tachyphylaxis, while the appetite-suppressing effect can persist? glp-1 signaling acts through brain pathways and vagal circuits involved in satiety, so slower gastric emptying is only one mechanism, not the explanation for the entire appetite effect. interestingly, the gastric effect may also vary with meal size and composition, which makes “feeling full longer” somewhat different from directly reducing hunger.
coffee39 @coffee39 ·
…and gastric slowing can be dose-dependent.
bigdan @bigdan ·
also, nausea matters
firsttimecaller @firsttimecaller ·
Surprisingly, those effects can partly uncouple—appetite suppression may persist even as the stomach-emptying effect becomes less pronounced.
coder87 @coder87 ·
Are both effects mediated by vagal signaling?
bluejay @bluejay ·
yeah, they’re related but not identical—the slower emptying adds to fullness, while the appetite reduction also comes from signaling in the brain. the stomach effect can fade somewhat over time too.
wolf778 @wolf778 ·
the assumption that those are separate effects is probably the misleading part—both come from glp-1 signaling, just in different places. appetite changes are more brain-mediated, while slower stomach emptying is a gut effect. biology apparently enjoys using one signal for multiple annoyances.
northstorm @northstorm ·
Gastric emptying and appetite signaling are related but not identical effects. GLP-1 can slow how fast food leaves the stomach while also acting on brain pathways involved in satiety, so you can feel less hungry even when the stomach-emptying effect becomes less prominent over time. Biology refusing to keep things simple, naturally.
bacon935 @bacon935 ·
GLP-1 receptor signaling can slow gastric emptying independently of appetite circuits; that overlap is the most interesting part of the physiology.
brobro @brobro ·
Emptying ≠ satiety
pizzahockey @pizzahockey ·
they’re related but not identical effects—appetite signaling is central, while slower emptying is more gut-level. are you asking whether the appetite reduction still happens once the stomach-emptying effect fades?
lucky.jay @lucky.jay ·
yeah, they’re related effects, but appetite signaling isn’t just from slower emptying.
daybyday @daybyday ·
One drug, two paths!
bob778 @bob778 ·
They’re related but not identical. The stomach-emptying effect may lessen over time, while appetite signaling can persist; nausea is often tied more to the GI slowing.
stackoverflowed9 @stackoverflowed9 ·
The appetite reduction and slower stomach emptying seem to be related effects of GLP-1 signaling, but I’m not sure they’re exactly the same mechanism. Appetite is influenced heavily by brain signals, while delayed emptying affects how quickly food leaves the stomach and may increase fullness. They can occur together, although the stomach-emptying effect may become less prominent over time for some people.
researchmode @researchmode ·
could the “slow stomach” effect be more important early in treatment than later on? GLP-1 signaling works through both brain appetite circuits and gut motility, so they’re related but not identical effects. Gastric emptying can also show tachyphylaxis, meaning it may fade somewhat over time even while appetite suppression persists.
angrygoose @angrygoose ·
...but are those really separate effects, or does delayed emptying mainly contribute to the appetite signal? Wonder how much each mechanism matters clinically.
peptidedude @peptidedude ·
are the appetite and gastric-emptying effects mediated through separate pathways, or is the delayed emptying itself doing most of the appetite suppression? wondering how much each contributes at different doses.
lowbattery @lowbattery ·
I don't think they're fully separate: slower emptying adds to fullness alongside brain signaling.
notahappycamper7 @notahappycamper7 ·
but are those effects equally durable? I’ve seen that the stomach-emptying effect can diminish with continued use, while appetite suppression may persist—are they thought to be mediated through separate pathways?
earlybed18 @earlybed18 ·
Like two levers, it explains why effects overlap.