Understanding the Impact of Stress on Emotional Eating and Cravings

Study Investigates the Impact of Stress on Eating Behavior

The Connection Between Stress and Eating

A recent study examines how stress-related emotional responses regulate feeding and the desire to eat. Eating behaviors are significantly affected by these emotional states, which can create a conflict with the urge to consume food, making the act of eating inherently complex. Temporary alterations in eating habits may serve as adaptive responses to emotional triggers such as anxiety, stress, or fear. In chronic eating disorders like anorexia nervosa, patients often exhibit disturbances in their emotional states, which include heightened stress and anxiety levels.

Understanding the Mechanisms in the Brain

While previous research has indicated that stress can either enhance or diminish a person’s motivation to eat, the specific brain mechanisms driving these changes remain unclear. In a new study published in Nature Communications, researchers from the United States investigated the neural circuitry associated with stress-related emotional responses and its subsequent influence on eating behavior using mouse models.

Key Findings from the Research

The research team concentrated on two critical areas of the brain: one associated with feeding and another linked to emotional responses. They identified a particular neural projection that facilitates communication from a crucial feeding region, which contains glutamatergic PVH neurons, to an emotion-related area associated with fear, aggression, and other emotional states relevant to eating behavior, containing LSv neurons.

Inhibiting this neural communication resulted in reduced anxiety levels and an increase in eating. Conversely, activating this pathway heightened anxiety and significantly decreased the desire to eat, overriding hunger cues. The researchers suggest that this neural communication is crucial for processing potential environmental threats, which can trigger temporary cessation of eating to mitigate danger.

Implications for Future Research and Treatment

The findings are the first to illustrate the role of this specific neural communication in the interplay between stress-related emotional responses and eating behaviors. Given the similarities between the nervous systems of mice and humans, these results may offer valuable insights into how the human brain manages emotions and hunger. The research team hopes their study will contribute to ongoing efforts to develop effective treatments for serious eating disorders.

References

Xu, Y., Lu, Y., Cassidy, R. M., Mangieri, L. R., Zhu, C., Huang, X., … Tong, Q. (2019). Identification of a neurocircuit underlying regulation of feeding by stress-related emotional responses. Nature Communications, 10(1). doi: 10.1038/s41467-019-11399-z (2019, August 16). Study reveals how stress can curb the desire to eat in an animal model. Retrieved from https://www.eurekalert.org/pub_releases/2019-08/uoth-srh081619.php