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A Flourishing Gut -- and Certain Behaviors -- Promote Good Health

by Linda Royer, PhD, RN

Pages 4 and 5 of 27

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How the Foods you Eat Affect How You Feel
From Nutritional Psychiatry: Your brain on food
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Serotonin is a neurotransmitter that helps regulate sleep and appetite, mediate moods, and inhibit pain. Since about 95% of your serotonin is produced in your gastrointestinal tract, and your gastrointestinal tract is lined with a hundred million nerve cells, or neurons, it makes sense that the inner workings of your digestive system don’t just help you digest food, but also guide your emotions. What’s more, the function of these neurons — and the production of neurotransmitters like serotonin — is highly influenced by the billions of “good” bacteria that make up your intestinal microbiome. These bacteria play an essential role in your health. They protect the lining of your intestines and ensure they provide a strong barrier against toxins and “bad” bacteria; they limit inflammation; they improve how well you absorb nutrients from your food; and they activate neural pathways that travel directly between the gut and the brain.

Studies have compared “traditional” diets, like the Mediterranean diet and the traditional Japanese diet, to a typical “Western” diet and have shown that the risk of depression is 25% to 35% lower in those who eat a traditional diet. Scientists account for this difference because these traditional diets tend to be high in vegetables, fruits, unprocessed grains, and fish and seafood, and to contain only modest amounts of lean meats and dairy. They are also void of processed and refined foods and sugars, which are staples of the “Western” dietary pattern. In addition, many of these unprocessed foods are fermented, and therefore act as natural probiotics.
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So, to express a general message of advice,
Diets that are high in whole plant foods (fruits, vegetables, legumes, whole grains, but low in added sugar, saturated and trans fats) stimulate the proliferation of beneficial bacteria such as those that have beneficial anti-inflammatory properties.  In other words, liberal amounts of raw fruits and vegetables are particularly useful in building healthy gut microflora. . . and add to that the improvement of your blood circulation for transport of those plant food nutrients. 

In contrast, a poor-quality or Western diet (rich in sugar, animal products, salt, processed foods, and refined carbohydrates) is linked to more disease-causing bacteria. Eating meals at regular times, exercise, and sufficient sleep help to populate the gut with disease-fighting bacteria.
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In this short ebook, I will describe some major strategies for the improvement of your nutritional intake.
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So, let's get started!