Gastric Stretch
Gastric stretch is the fullness signal produced by the stomach being physically distended, meaning stretched by what is in it, independent of what that food actually contains. It is a genuine satiation signal and a short-lived one: as the stomach empties, it stops mattering. That is the honest physiological half of being hungry an hour after a large lunch, because a large meal that clears the stomach quickly leaves an empty stomach quickly.
What it is
Two lunches of the same size can leave a person feeling differently an hour later, partly because of how fast each one clears the stomach. The stretch signal is reporting volume, not nourishment. It fades on the stomach's schedule rather than on the body's, and it has no way of knowing what the meal was made of.
That is a useful thing to know about your own experience, because it means the sensation of having eaten enough and the state of having eaten enough are produced by different things and come apart routinely.
In effect
What this page is standing on, stated plainly
Distension as a satiation signal is standard physiology, and the research pass behind this page recorded it as real and short-lived. This site has not read a primary source for it, and no originator is claimed here. That is why the mechanism is described and no figure and no timing is attached to it anywhere in this page's body copy. A number would imply a source that has not been opened.
Where it sits among the other signals
This is the physiological half of a story whose better-evidenced halves are psychological. The learned parts, conditioned hunger and expected satiation, and the remembered part, meal memory, have stronger human evidence behind them than this does.
Both sides, then the line. For giving stretch real weight: it is uncontroversial physiology, it is intuitive, and it genuinely explains why volume and fullness track each other in the short term. Against leaning on it: it is the least well sourced item in this cluster on this site, and it is the one most likely to be offered as the whole explanation because it is the easiest to picture. Where we land: describe it, keep it in proportion, and do not let it carry more weight than the learned and remembered parts of the story.
What it does not say
It does not come with a timing. No number of minutes appears here, because no primary source has been read that would support one.
It does not tell you what to eat. Nothing on this page is advice about volume, composition, timing or portions, and the fact that a low-density food fills a stomach is not offered as a technique.
It is not the main event. The learned and remembered parts of appetite have better human evidence than distension does, and this page defers to them.
It reports volume, not nourishment. A signal about how stretched the stomach is says nothing about what was in the meal.
Nobody is credited with it. No originator is named, because the vault has not verified one.
Sources
- No primary source read. Carried from the research pass for Why You Are Hungry an Hour After a Big Lunch, article 19, 2026-09-11, which recorded gastric distension and gastric emptying as a real but short-lived satiation signal. No originator claimed, and no figure or timing recorded.
- Vault record, 2026-09-11. Evidence status primary-cited at the level of standard physiology, with the absence of a read source stated in the body rather than buried.
- Where this came from
- No book in this library is the source of this concept. It entered the vault from Why You Are Hungry an Hour After a Big Lunch, built from primary sources rather than from a book.