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Located at the top of nose, just behind the bridge, the olfactory bulb connects with the satiety center and uses odor molecules to operate its signals of "You've eaten enough, you are satisfied now.
Research from the Imperial College in London and University of Naples has found that short chain fatty acids created by fermentation activate endothelial cells in the colon to release satiety hormones such as PYY, GLP-1, GIP These travel to the brain's satiety centers and dampen further eating.
In fact, studies suggest that caloric beverages promote weight gain because their calories don't "register" as food in the brain's satiety centers.