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In animal studies, for instance, it’s found out that signal sent between the gut and brain is inhibited by stress, and at the same time causing gastrointestinal problems. In the event of an extreme syncope, the flow of blood to the brain is greatly restricted, resulting in loss of consciousness. Individuals who have lower resting heart rate variability have higher vulnerability to stress, and it takes them longer to recover from experiences that are considered stressful or traumatic. As a result, the vagus impulses are increased from the liver to the brain, and this slows metabolic rate.