Cravings & Brain Control: Rutgers Research
Rutgers University researchers have unlocked the secrets of brain circuits, mapping the pathways that dictate appetite control and weight loss. Studies reveal the intricate dance between hunger and satiety, offering fresh insights into how the brain regulates cravings, the primarykeyword. Scientists pinpointed key neural connections influenced by the GLP-1 receptor pathway, opening doors to more effective medications. The secondarykeyword,ghrelin,also plays a role in this complex system. This could revolutionize how we approach weight management, potentially leading to drugs wiht fewer side effects. Explore these groundbreaking discoveries with News Directory 3. discover what’s next in the quest to curb cravings.
Brain Circuits Key to Appetite Control, Weight Loss
Updated June 15, 2025
New research from Rutgers Health suggests that the brain’s communication with the stomach involves a complex interplay of signals, with one side promoting eating and the other signaling satiety. These findings about appetite control and weight loss could lead to more refined weight-loss drugs with fewer side effects.
Two studies, published in Nature Metabolism and Nature Communications, detail complementary neural pathways governing hunger and satiety. The research offers a wiring diagram that could improve current weight-loss medications.
One study, led by Zhiping Pang at Robert Wood Johnson Medical School, identified a group of neurons connecting the hypothalamus to the brainstem. These cells are rich in GLP-1 receptors,targeted by drugs like Ozempic.Stimulating this pathway in mice led them to stop eating, while silencing it caused weight gain.Fasting weakened this connection, but GLP-1 restored it.
Pang cautioned that continuous stimulation of this pathway by drugs could disrupt the brain’s natural rhythms, leading to side effects. “The synapse is a volume knob that only turns up when energy stores are low,” Pang said.
The second study, led by Mark Rossi, mapped the hunger circuit, tracing inhibitory neurons from the stria terminalis to the lateral hypothalamus. Activating this circuit in mice prompted them to seek sugar water, while blocking it reduced their appetite, even after fasting.
Hormones also play a role. Ghrelin, a hunger messenger, increased food-seeking behavior, while leptin, a satiety signal, suppressed it. Overfed mice lost this response, but it returned after dieting.
“Pang’s pathway shuts things down,” Rossi said.”Ours steps on the accelerator.”
Both teams observed that energy state quickly rewires synapses. Fasting increases the sensitivity of the hunger circuit while weakening the satiety circuit, and the reverse occurs after eating. This push-pull mechanism may explain why some diets and drugs lose effectiveness over time.
These findings about hunger and satiety may lead to drugs that work better than current GLP-1 medications. While drugs like Wegovy and Zepbound can cause significant weight loss, they also have side effects like nausea and muscle wasting. Pang’s research suggests that targeting only the brainstem circuit could reduce these side effects.Rossi’s work indicates that restoring the body’s response to ghrelin could help dieters overcome plateaus.
The studies used advanced techniques like optogenetics, chemogenetics, and fiber-optic photometry to precisely manipulate and monitor neural pathways.
what’s next
Future research will focus on refining drug design. Pang aims to measure GLP-1 release in real time to determine if short bursts are sufficient to control appetite. Rossi is identifying the molecular characteristics of hunger-trigger cells to find drug targets that manage cravings without eliminating the pleasure of eating.