Abstract
The mere presence of lipids in the intestine is known to reduce nutrient intake in both rodents and humans by activating the intestinebrain neural axis. More recently, studies have indicated that the brain senses blood lipids directly to inhibit glucose production and maintain glucose homeostasis in rodents through a brainliver neural axis. Now comes the first demonstration that upper intestinal lipids rapidly inhibit glucose production through an intestinebrainliver neurocircuit. Work in rats shows that the lipids or fats which enter the small intestine trigger the afferent neuronal signal to the brain, which then sends signals to the liver to lower glucose production and blood glucose levels in as little as fifteen minutes. But eating a high-fat diet for just three days can interfere with this signal, disabling it so that it does not signal the other organs to lower blood glucose levels. This holds out the prospect that novel sites and targets may be revealed to lower glucose or blood sugar levels in those who are obese or have diabetes.
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