Mental Digestion: Your Second Brain

By Natalie Rivera

When experiencing a digestion problem, we often think of food as the culprit. While the quality of our food definitely is a factor in this equation, we usually overlook the true villain—STRESS.

Go to a doctor for digestive issues, and it’s likely you will come home with a prescription (or three) to reduce symptoms, stimulate the digestive track, and probably even “treat” anxiety or depression. Visit an alternative medical doctor and you’ll come home with a prescription to eat raw foods, enzymes, and herbs. But no amount of drugs or herbs is going to fix digestive difficulties in the long run if the problems are caused by stress. And if you have digestive problems, chances are stress is the engine powering them!

A Tale of Two Brains

Our digestive system is autonomous, meaning it thinks for itself—without requiring the brain’s signals to tell it what to do. Research has found that our gut has 500 million neurons, second only to the brain, and is over 9 meters long. More and more, scientists are recognizing the importance of digestion and refer to our intestines as our “second brain.” Anyone who has ever experienced a “gut feeling” can confirm the validity of this. Many people even look to this “gut brain” for signals to help make decisions!

Although autonomous, our gut brain is intimately connected to our big brain. The primary connection is through the vagus nerve, which starts at the base of the brain, travels across the chest, and branches throughout the gut. A majority of the signals going between the gut and the brain are going in reverse, meaning our gut impacts the rest of our body—not just by determining the quality of our nutrient absorption and distribution, but by telling our brain how we feel. There is truth in the saying,

“Trust your gut.”

The gut brain produces a wide range of hormones and around 40 neurotransmitters. Most of these are the same as those found in the brain: the gut produces as much dopamine (helps control the brain’s reward and pleasure centers) as the brain and 95 percent of the body’s serotonin. Serotonin, the body’s natural “feel good” drug, is a factor in depression, sleep, appetite, body temperature, and repair and development of various organs and body systems such as the liver, lungs, heart, and bone. Wow!

The Stress Effect

Have you had any of the following symptoms or conditions?

  • Heart disease
  • Sleep problems
  • Digestive problems
  • Depression
  • Obesity
  • Memory impairment
  • Diabetes
  • Hair loss
  • Hyperthyroidism
  • Anxiety
  • Fatigue
  • Sexual dysfunction
  • Tooth and gum disease
  • Ulcers

Well, according to Mayo Clinic (and most other scientific sources), all of the above have a PROVEN, direct link with stress. Why does stress cause these ailments? According to Dr. Mercola, whose website is the No. 1 ranked “natural health” website in the world, the stress response causes a number of detrimental events in the body, including:

  • Decreased nutrient absorption
  • Decreased oxygenation to the gut
  • Four times less blood flow to the digestive system
  • Elevated cholesterol
  • Elevated triglycerides
  • Decreased gut flora populations
  • Increased food sensitivity
  • Heartburn
  • Decreased enzyme production in the gut

So, then, why does stress cause these physiological reactions in the body? The University of Kentucky School of Medicine conducted extensive studies on the distribution of blood flow throughout the body during exercise, and it has the exact same impact on the body’s blood flow distribution as chronic stress. A peaceful, resting body expends a majority of its energy in the digestion process; however, as exercise becomes more strenuous, blood flow increases and the body stops blood flow to regions nonessential for exercise, specifically the digestive system, and reroutes it to the muscles.

During exercise, digestion stops.

Imagine we exercised ALL the time and stopped digesting completely…Now we’re starting to get to an understanding of how stress can impact the body. Let’s look closer.

The Butterfly Effect

The gut is intricately linked to your state of mind, as you know if you’ve ever had butterflies before a big date or felt sick before an exam. Feeling butterflies in the stomach is just a milder version of a more severe reaction experienced during a traumatic event (or even a scary interview). During these situations, the body enters fight-or-flight mode and the brain issues a surge of stress hormones, signaling the body to focus all its resources (including blood flow, like in the case of exercise) on the problem—leaving the regulation of digestion on the back burner.

The “butterflies” are the feeling of blood leaving the digestive track.

In response, the gut may go into overdrive (otherwise known as diarrhea or vomiting). Good times.

The Saber-tooth Effect

If our bodies didn’t have a natural stress response we would be dead. Actually, our ancestors would have died and we never would have been born at all.

Our fight-or-flight response was designed to save our cave-dwelling ancestors from an untimely death in the jaws of a saber-toothed predator.

Today, humans are on the top of the food chain, but we may recognize the symptoms of flight-or-flight response from the last time someone cut us off in traffic:

  • increased heart rate
  • elevated blood pressure
  • increased oxygen in the brain
  • increased muscle tension
  • a boost in energy supply (no coffee needed!)

But, according to Mayo Clinic there are also a few things going on under the surface that you wouldn’t notice:

  • altered immune system responses
  • suppressed digestive system (who needs to digest when you’re running from a saber-toothed tiger?)
  • suppressed reproductive system and growth (saving your own butt takes priority over survival of the species)

According to the National Institute of Mental Health, other symptoms you may be familiar with include sudden lack of appetite, heartburn, nausea, and stomach pains.

The chemicals and hormones, such as adrenaline and cortisol, released to save our lives are supposed to return to normal after our Neanderthal is sitting around the cave fire telling his buddies about his narrow miss. But in the modern world our bodies don’t normalize because our stress isn’t caused by threat of death.

For us, everything looks like a toothed predator!

Our stress is constant! Overbearing bosses, tight schedules, nagging children, distant spouses, and empty hearts put many of us in a state of chronic stress—as if we’re in a perpetual state of fight or flight.

Remember what happens when we exercise? Stress has the same impact on our bodies, but unlike exercise, American’s experience stress nearly 24 hours a day.

“Prolonged stress has a significant effect on digestive health. The blood supply to the organs of digestion is increasingly diminished making repair difficult and digestion weak. In time, the bacterial eco-system in our digestive tract (so vital for nutrient absorption) becomes unbalanced and pain, constipation and/or diarrhea are more common.” ~Sue Webster, colon hydrotherapist.

Mental Indigestion

If stress is the cause of physical indigestion, what is the cause of stress? MENTAL indigestion!

Most people bebop through life oblivious to their mental, emotional, and physical states and do not notice how stress effects them until they’re at the doctor’s office asking for a pill. I would like to propose that if we PROCESS what happens in our lives and DIGEST what enters our minds, we can reduce our stress, better digest our food, and regain our health!

Below are common symptoms and causes of MENTAL indigestion. (In many cases, people experience the corresponding physical digestive ailment in conjunction with its mental/emotional counterpart):

  • Mental Constipation: repression of feelings, resistance of what IS, unwillingness to look at and process a situation or feeling, brain lock.
  • Mental Diarrhea: complete withdrawal of attention to mental processing, inability to absorb information, thoughts run amok.
  • Mental Gagging: trying to swallow large mental concepts or ideas in one bite, biting off more than you can chew, attempting to swallow a belief you don’t believe.
  • Mental Nausea: consumption of poisonous or rotten thoughts, fear or nervousness due to not having a plan.
  • Mental Bloating: inability or unwillingness to release, holding in emotions.
  • Mental Reflux: lack of balance, the painful burn of regretful thoughts.
  • Mental Weight Gain: holding onto emotions, such as resentment, fear, and guilt (causing them to get stuck in (and expand) your (fat) cells).
  • Indigestion: some things are just not digestible, such as bones. What bone are you gnawing? Put down the bone. Bad dog.

Stepping Away from the Cliff

So why is properly digesting both your thoughts and your food, and therefore reducing your stress, so important? Because stress is cumulative, meaning the stress from our work and family and traffic and environmental pollutants each add a layer of stress. The more layers we have, the more sensitive we become to each additional stressor. If our mental health is not being tended to, the stress of frustration, fear, nervousness and sadness put our bodies in a less-than-optimal state, impacting our digestion (among other things), which further adds stress to our bodies and reduces our reserves. All of these stress sources accumulate a “stress-effect” in the body, ultimately leading to increased sensitivity to stress and eventually dis-ease.

Here’s an illustration of how this stress-effect works: Imagine you are walking down the sidewalk and you trip. There would be a mild reaction and you’d recover quickly. Now imagine you were walking 2 feet from the edge of a cliff and you tripped. You would be terrified and your body would go into complete panic. Now imagine a time when you were feeling pretty good—things were going well—and someone you love left dishes on the table or you were stuck in traffic. They were mild irritants. Now imagine you had a horrible day at work and you’d been feeling sick and your back was hurting and you were behind on your bills and you walk into the bathroom in your socks and step right into the soggy puddle your kid (or spouse) left on the floor—again—after his or her shower. Steam comes out of your ears and you restrain yourself (or don’t) from screaming like a banshee. The difference in your reaction in each case was the difference in the extent that the stressor affected you. The stressor didn’t change in intensity—you were closer to your cliff.

So, what can you do about it? Back off the cliff! Actively practice techniques for reducing your stress. Below are tools for improving mental AND physical digestion:

  • Get proper health care for existing digestive problems (digestive issues can also CAUSE stress).
  • Seek support for difficult life situations, such as counseling, life coaching, or support groups.
  • Develop a gratitude practice, such as journaling.
  • Exercise in any form that you enjoy.
  • Do what you love.
  • Make the changes you’ve been putting off.
  • LET GO.
  • Explore stress reduction programs, such as yoga, massage, and acupuncture.
  • Develop a spiritual practice or join a spiritual group.
  • No. 1 importance: learn a process for “skilled relaxation” such as meditation and practice it for 20 minutes (or more) per day

And remember “… or get off the pot.”

Sometimes you’re just not ready to process or digest certain thoughts, emotions, experiences, or food, and that’s okay.


Natalie Rivera is a firestarter, speaker and entrepreneur. She is passionate about empowering others to GET REAL and live authentically. After a decade of living a life that wasn’t hers and developing Chronic Fatigue Syndrome, Natalie let go of everything and completely transformed. Through her journey to healing she rediscovered her true self and greater purpose—to inspire others to transform their lives. Natalie “retired” from the rat race at 24, put herself through school as a freelance designer, created a non-profit teen center, and later created Transformation Services, Inc., which offers motivational speaking, curriculum development, life coaching, event management, and publishing. She is also the Publisher of Transformation Magazine. Visit

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