[PSA] incretin is not what most of this community thinks it is
incretin is not what most of this community thinks it is, written plainly and without the jargon that usually swallows this topic.
The mental model, in four steps, that makes the rest of this site legible.
One: gut hormones amplify the insulin response to food. Two: agonists at those receptors act peripherally on insulin secretion and gastric emptying, and centrally on appetite. Three: structural modification gives them a long half-life, so exposure is smooth and weekly. Four: tolerance develops to some effects and not to others.
From those four, most of what the experience boards report falls out: why the side effects cluster early, why they settle at a stable dose, why appetite reduction persists, and why the scale and the appetite move on different clocks.
Went looking for human data on a mechanism everybody here asserts. Found preclinical work and one small study. That was clarifying.
Started reading limitations sections first. It has changed how much weight I give to almost everything posted here.
Tell me where this is wrong. That is the useful part of posting it.
best — the order this archive was captured in
GIP receptor biology is genuinely unsettled — there is a live argument about agonism versus antagonism at the receptor — and the clinical results are robust regardless, which is an uncomfortable and interesting position.
This. Albumin binding and modification are why the half-life is what it is, and it is a design decision rather than an accident.
Are we talking about receptor affinity or clinical potency?
Agreed — the incretin effect is the load-bearing concept and everything downstream reads differently once you have it.
Push back: a receptor being expressed in a tissue does not tell you the agonist reaches it at therapeutic exposure.
Push back: a receptor being expressed in a tissue does not tell you the agonist reaches it at therapeutic exposure.
Adding the caveat the paper itself makes in its limitations section, which is stronger than anything in this thread.
incretin effect first, then everything else in this board makes sense
Yes. The central component is the one that explains the reports on this site better than gastric emptying does.