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Regulation of Food Intake

Regulation of Food Intake

Short-term regulation of food intake primarily involves neural signals from the gastrointestinal (GI) tract, blood nutrient levels, and GI tract hormones. Communication between the gut and brain via vagal nerve fibers plays a significant role in evaluating the contents of the gut. Clinical studies have shown that protein ingestion produces a more prolonged response in these nerve fibers compared to an equivalent amount of glucose. Additionally, the activation of stretch receptors caused by GI...

Neural Regulation

Neural Regulation

Digestion begins with a cephalic phase that prepares the digestive system to receive food. When our brain processes visual or olfactory information about food, it triggers impulses in the cranial nerves innervating the salivary glands and stomach to prepare for food.

Hormonal Regulation

Hormonal Regulation

Hormones regulate a significant portion of digestion through activation of the neuroendocrine system. The neuroendocrine system of digestion contains many different hormones all with multiple functions that are both, directly and indirectly, involved in digestion.

Primary Motives: Hunger and Thirst

Primary Motives: Hunger and Thirst

Hunger and thirst are fundamental physiological drives crucial for maintaining homeostasis and ensuring the survival of both humans and animals. These drives are regulated through complex interactions between the brain, hormones, and sensory receptors.
Hunger arises when the brain detects changes in the body's nutrient levels, including glucose, lipids, amino acids, and hormones such as ghrelin and leptin. The hypothalamus plays a central role in hunger regulation. The lateral hypothalamus...

Glucose Absorption Into the Small Intestine

Glucose Absorption Into the Small Intestine

Complex carbohydrates consumed cannot be absorbed into the small intestine in their original form. First, they must be hydrolyzed to a monosaccharide form such as glucose or galactose. These monosaccharides are then transported across the intestinal membrane and into the blood via transcellular transport. The intestinal epithelial cells allow the movement of these monosaccharides with a defined 'entry' through membrane transporter proteins present on their apical membrane and...

Diencephalon: Hypothalamus and Coordination

Diencephalon: Hypothalamus and Coordination

The hypothalamus is a small yet highly complex and essential brain region that plays a crucial role in regulating various bodily functions. Anatomically, it is located at the base of the brain, just above the brainstem and below the thalamus, forming part of the limbic system.
The hypothalamus interacts with other brain regions, including the pituitary gland, through a direct physical connection called the hypothalamic-pituitary axis. The hypothalamus receives somatic and visceral inputs and...

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Related Experiment Video

Updated: Nov 21, 2025

Real-time Analysis of Gut-brain Neural Communication: Cortex wide Calcium Dynamics in Response to Intestinal Glucose Stimulation

Real-time Analysis of Gut-brain Neural Communication: Cortex wide Calcium Dynamics in Response to Intestinal Glucose Stimulation

Published on: December 29, 2023

Hypothalamic detection of macronutrients via multiple gut-brain pathways.

Nitsan Goldstein¹, Aaron D McKnight², Jamie R E Carty¹

¹Department of Biology, University of Pennsylvania, Philadelphia, PA 19104, USA.

Cell Metabolism

|January 15, 2021

Summary

Different nutrients use distinct gut-brain pathways to signal satiety. Fat signals via the vagus nerve, while glucose uses spinal pathways and specific sensors, inhibiting hunger-promoting neurons.

Keywords:

AgRP fat food intake glucose gut-brain hepatic portal vein hypothalamus intestine spinal afferents vagus nerve

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Last Updated: Nov 21, 2025

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Published on: May 8, 2018

Area of Science:

Neuroscience
Gastroenterology
Metabolism

Background:

Food intake is regulated by intricate gut-brain communication.
Hypothalamic Agouti-related protein (AgRP) neurons are key regulators of hunger.
Macronutrients may use specific pathways to influence neuronal activity.

Purpose of the Study:

To investigate how different macronutrients inhibit AgRP neuron activity.
To determine the distinct gut-brain signaling pathways for fat and glucose.
To identify the sensors involved in nutrient-mediated inhibition of AgRP neurons.

Main Methods:

Studied AgRP neuron activity in hungry mice.
Investigated the role of vagal and spinal gut-brain signaling.
Identified intestinal and hepatic portal vein glucose sensors.

Main Results:

Intestinal detection of macronutrients inhibits AgRP neuron activity in a site-specific manner.
Vagal signaling is essential for fat-induced AgRP neuron inhibition.
Spinal signaling mediates glucose-induced AgRP neuron inhibition, involving specific sensors.

Conclusions:

Distinct gut-brain pathways are activated by different macronutrients to reduce hunger signals.
Fat and glucose utilize separate neural pathways (vagal vs. spinal) to inhibit AgRP neurons.
Specific glucose sensors in the gut and portal vein play a role in satiety signaling.