The feeling of being full, or satiety, is a basic signal the body sends, but it can be delayed or mixed with a strong desire to keep eating. Stress may play a role in this, as emotional eating is often linked to the hormone cortisol, cravings, or a reduced ability to resist comforting foods. A recent study suggests that stress can sometimes affect this process earlier by changing how some people perceive internal signals from their body. The perception of satiety is not a simple gauge but a continuous interaction between the intestine, brain, and the context of a meal. Stress can make it harder to notice these signals. Scientists use the term interoception to describe the ability to sense and interpret internal messages. This process involves the nervous system monitoring states like a full or stretched stomach. Miriam Kipping, a psychologist at the University of Ulm in Germany, explains that the feeling of satiety depends on how a person perceives and interprets internal signals. Appetite and food cravings involve more complex factors, including emotions and motivations. Someone may be physically full but still want a piece of chocolate. To see how acute stress affects satiety perception, Kipping and her colleagues conducted an experiment with 94 adults who had fasted. Participants ate yogurt from a bowl that was secretly filled gradually using a hidden pump, creating the illusion that the amount of yogurt remained the same. This setup, known as the "magic table," made participants rely on their internal stomach sensations. They completed the experiment after a low-demand task and a stressful mental arithmetic task. Acute stress did not reduce the perception of satiety in all participants. However, those who reported greater difficulty regulating their emotions and those with more restrictive or less controlled eating behaviors consumed more yogurt before feeling full. The difference was not at the initial sign of satiety but when fullness was expected to be complete. Identifying oneself as an emotional eater did not predict this effect. Researchers suggest that stress may reduce sensitivity to strong satiety signals, and this effect varies based on individual emotional states and eating habits. Kipping emphasizes that these findings are preliminary and more research is needed. The feeling of satiety does not begin or end in the stomach. When food arrives, the stomach stretches, activating the vagus nerve, which sends signals to the brainstem. As food moves through the intestine, nutrients and calories generate additional signals. The brain combines this information with taste, memory, expectations, and reward mechanisms to determine when a meal is sufficient. Guillaume de Lartigue, a neuroscientist at the Monell Chemical Senses Center and the University of Pennsylvania, explains that the vagus nerve connects the body's organs to the brain and vice versa, creating a continuous communication loop. Much of this process occurs outside of conscious awareness, with the brainstem automatically processing signals and the insula helping to make bodily sensations conscious. The way stress intervenes in this system remains complex. Acute stress, such as before an important presentation, can prepare the body for action and, in some people, reduce appetite. Chronic stress, however, involves prolonged tension, such as poor sleep due to ongoing work or home issues. Responses to stress can vary over time in the same individual. Rajita Sinha, director of the Yale University Stress Center, explains that stress effects can vary according to life stages. Someone who previously forgot to eat when stressed may later find themselves seeking comfort food. Studies on animals suggest that stress and satiety systems are closely related. A 2025 study on mice found that activating vagus nerve neurons responsible for detecting organ stretching led to reduced eating and drinking, while brain activity associated with vigilance and stress increased. However, the study did not directly assess satiety. Guillaume de Lartigue's laboratory is investigating whether repeated stress can decrease the sensitivity of vagal pathways that transmit digestive information. If these pathways become less reactive to stomach distension or nutritional signals, the brain may receive weaker messages indicating a meal has been consumed. However, data remain contradictory, as another study found chronic stress made gastric fibers of the vagus nerve more sensitive. Rajita Sinha describes stress as a "joker" in the balance between energy intake and expenditure. Cortisol helps release energy during acute stress, but chronic stress can make energy-rich foods more attractive. This complexity is important when advising people to "listen to their body." Sinha suggests rephrasing the advice to observing what the body and mind are signaling, as hunger is just one signal among others. Miriam Kipping adopts a similar approach, noting that people who have lost contact with their hunger and satiety sensations may benefit from reintroducing structure, such as regular meals, to gradually learn to observe their body's signals. The goal is to understand that these messages are real, dynamic, and influenced by context. "Listen to your body" may seem simple, but biology suggests that this skill needs to be learned, and under stress, the signal itself can become more difficult to perceive.