The Physiological Anti-Stress Mechanism Where Rhythmical Chewing Blocks the Chain of 'Binge Eating and Emotional Eating' Caused by Anxiety in the Brain's Center

“Emotional eating”—the act of stuffing a massive amount of sweets or snacks into your mouth when you feel the pressure of work or anxiety from relationships, even though you aren’t hungry. This seemingly uncontrollable impulse does not occur because the person has weak willpower. It is a biological error where the brain, reacting to excessive stress, tries to numb the anxiety by quickly obtaining “pleasure chemicals (dopamine).”

To break this destructive “chain of anxiety and binge eating,” the routine of “chewing (chewing in a constant rhythm)” should be introduced as a highly effective, zero-calorie physical approach.

”Runaway HPA Axis” That Triggers Emotional Eating

When humans face strong anxiety or stress, the stress response system called the “hypothalamic-pituitary-adrenal (HPA) axis,” which starts from the hypothalamus in the brain, goes into full operation. As a result, a large amount of the stress hormone (cortisol) is released into the blood, and the sympathetic nervous system falls into a state of extreme tension.

• When cortisol remains chronically high, the brain feels a severe depletion of energy and begins to strongly crave “high-calorie foods rich in carbohydrates and fats” (inferred from findings such as E08 regarding overload on the metabolism and nervous system).
• At the same time, to instinctively alleviate anxiety, it tries to rely on the temporary “reward (dopamine secretion)” brought about by the act of eating itself. In other words, you unconsciously stuff yourself with food not to satisfy hunger, but as a “sedative for the brain.”

When in this state, simply wishing in your mind to “hold back from eating” cannot overcome the strength of the SOS emitted by the brain’s survival system. Conversely, the very act of holding back becomes a new stressor, causing a vicious cycle that accelerates binge eating.

The “Physical Stress Buffer System” Activated by Chewing

Here, the physical movement of the facial muscles known as “repetitive chewing” functions as a powerful stopper. There is a clear neuroscientific basis for why athletes continuously chew gum in a constant rhythm under extreme pressure (behavior related to E11, etc.).

1. Activation of the Serotonergic System and Offsetting Anxiety: Rhythmical movement with a constant tempo, such as chewing, strongly activates the serotonergic nervous system in the raphe nuclei of the brainstem. The secreted serotonin (a neurotransmitter that brings a sense of security) directly suppresses (offsets) the excessive excitation of areas that feel fear and anxiety, such as the amygdala.
2. Brakes on the HPA Axis (Lowering Cortisol): Sensory input from chewing is fed back to the hypothalamus and acts as a direct brake on the runaway HPA axis. In fact, multiple studies have proven that continuous gum chewing physically lowers cortisol levels in the blood and saliva during stress loading.
3. Alternative to the Dopamine-Dependent Circuit: The act of “putting something in the mouth and chewing” itself provides a certain level of satisfaction to the brain’s reward system. By providing a mild reward through the physical stimulation of chewing instead of an intense dopamine rush from sugar, it becomes possible to weather the peak of the impulse to “eat.”

Implementing a Chewing Routine to Stop “Overeating Due to Anxiety”

If you have a habit of emotional eating, the only defense strategy is to prepare an “outlet route (safety valve) that calms the brain with actions other than eating” in advance for the moment the impulse arises.

• “Chew Gum” When You Feel the Trigger: When you are frustrated, restless with anxiety, or at the moment you unconsciously almost head to the refrigerator or convenience store, first put “sugarless hard gum” in your mouth.
• 15 Minutes of Chewing as a Timer Replacement: Even when the gum loses its flavor, do not throw it away, but continue to chew rhythmically from the front teeth to the back teeth at a constant tempo for “at least 15 minutes.” This “15 minutes” is the physiological downtime (cooling-off period) necessary for serotonin secretion to sufficiently rise and the impulsive peak to subside.
• Rewriting Cognition Through Alternative Behavior: Instead of the self-hatred (a new stressor) of “I ate it,” accumulating the successful experience of “I was able to control the impulse by chewing gum” will rewrite the brain’s initial response route to stress.

“Chewing” is the easiest and most powerful mental control device for physically fighting back (countering) the invisible enemy of anxiety using your own facial muscles.