three years of incretin threads, summarised so you do not have to read them
three years of incretin threads, summarised so you do not have to read them — a position I have arrived at slowly and would like tested.
Why mechanism talk keeps misleading people, including me.
A mechanism tells you a direction. It does not tell you a magnitude, a timescale, or whether the pathway is operative at the exposures involved. "Receptor X is expressed in tissue Y" is a fact; "therefore effect Z in a person" is a hypothesis with several missing steps.
The corrective is boring and it works: ask whether the evidence is preclinical or human, ask what exposure was used, and read the limitations section before the abstract. Most of the confidently wrong posts on this board — several of them mine — skipped all three.
GLP-1 receptor agonism acts both peripherally — insulin secretion in a glucose-dependent way, slowed gastric emptying — and centrally, on appetite regulation. The central component is the better explanation for sustained intake reduction.
The incretin effect is the observation that oral glucose provokes a larger insulin response than intravenous glucose at matched glycaemia, and the difference is mediated by gut hormones. That is the foundation the whole class sits on.
If somebody has the same thing measured a different way, post it next to mine and we will see whether they agree.
best — the order this archive was captured in
Glucose-dependent insulin secretion is why hypoglycaemia risk is low as monotherapy: the effect scales with glycaemia rather than acting unconditionally.
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a mechanism you can state is not a mechanism you have demonstrated
glucagon agonism sounds paradoxical until you read the energy expenditure work
Disagree. That is a preclinical finding in a rodent model and you are stating it as human pharmacology.
Spent an evening on the receptor distribution literature and the side-effect map suddenly stopped looking random.
receptor distribution is why the side effects are where they are
Read the primary paper after arguing about the summary for a fortnight. The discussion section said almost the opposite of what the thread had concluded.
Careful — you have a plausible mechanism and no evidence that it is the operative one in the case you are describing.