A reference post rather than a discussion. Corrections are the point; I would rather this be right than mine. It is about food noise, and it is deliberately narrow — everything I am not confident about is marked as such.
What is actually established
Food noise is the best term this community has produced and it describes something the trials did not measure well: the constant background computation about food that most people with obesity live with and most people without it do not believe exists. GLP-1 agonism reduces the salience of food cues in the reward pathway rather than simply reducing hunger, which is why the reported experience is silence rather than willpower. It is also why its return on dose reduction is the first thing people notice, well before the weight moves.
The condition it depends on
It is worth naming the loss side of it. Food was a source of pleasure and structure, and its removal can leave a gap that people are not prepared for.
What I am not sure about
So the question, as narrowly as I can put it: whether the quiet is the same mechanism as the appetite suppression or a separate one, because they seem to come and go on different schedules. I have searched first, so if this is covered somewhere point me at it and I will read it.
LipidDoc_ATL said:Food noise is the best term this community has produced and it describes something the trials did not measure well: the constant background…
Neuroscience perspective on food noise:
GLP-1 receptors are expressed throughout the CNS, with high density in the hypothalamic arcuate nucleus, area postrema, and — critically — the mesolimbic reward pathway[1].
This is directly relevant to food noise because the central effects of GLP-1 agonists extend far beyond simple appetite suppression. The reduction in "food noise" that patients describe is likely mediated by modulation of dopaminergic signaling in the VTA and nucleus accumbens.
The emerging data on reduced addictive behaviors (alcohol, gambling) further supports this mechanism. food noise should be understood in this broader neurobiological context.
[1] Merchenthaler I, et al. J Comp Neurol. 1999;403(2):261-280.
LipidDoc_ATL said:Food noise is the best term this community has produced and it describes something the trials did not measure well: the constant background…
LipidDoc_ATL said:...regarding food noise mechanism of action...
To build on this — the mechanism is more complex than "it makes you less hungry." GLP-1 agonists:
- Activate hypothalamic satiety centers (appetite reduction)
- Delay gastric emptying (prolonged fullness)
- Potentiate glucose-dependent insulin secretion
- Suppress glucagon secretion
- Modulate reward pathway dopaminergic signaling
- Reduce hepatic lipogenesis
- Have direct cardiovascular protective effects
It's a multi-target drug with systemic metabolic effects. Understanding the mechanism helps us predict and manage side effects.
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Shop Reference StandardsDr.NateNeph said:LipidDoc_ATL said: ...regarding food noise mechanism of action...
Central vs peripheral GLP-1R signaling in food noise: elegant studies using brain-penetrant vs peripherally-restricted GLP-1 agonists show that ~80% of the weight loss effect is centrally mediated[1].
The key brain regions: arcuate nucleus (appetite), area postrema (nausea), NTS (satiety), VTA/NAc (reward). Peripheral effects (gastric emptying, insulin secretion) contribute but are secondary for weight loss.
This has implications for next-gen drugs: optimizing brain penetration and CNS receptor occupancy may be more important than systemic exposure.
[1] Secher A, et al. J Clin Invest. 2014;124(10):4473-4488.
LabKate said:Neuroscience perspective on food noise: GLP-1 receptors are expressed throughout the CNS, with high density in the hypothalamic arcuate nucleus, area…
Same pattern here, and in the same order.