Part One: The Basics of the Digestive System

In Part One of this book I explain the basics of the digestive system, how it works and how you can start reading the signs and signals that the body sends to you when it needs to let you know how it feels. Not everyone can be a mind reader, but all of us can develop some very simple 'body-reading' techniques and use them on a daily basis.

Carbs & Fibre, Fat, Protein, welcome to the digestive system
A Complicated Tube

The body requires carbohydrates to produce energy. Proteins are used by the body for rebuilding and maintaining healthy cells and bones as well as the blood and lymphatic systems. Fats are very important for the work of neurotransmitters: they help the assimilation of vitamins and other nutrients and are also used by the body as a long-term energy store, which it can call upon when it's running low on carbohydrates.

All these nutrients are being ingested, digested, absorbed, assimilated and eliminated in the digestive tract. The digestive tract is a long tube which starts in the mouth and ends in the anus. It is a sealed system, which basically means that the food we eat can communicate directly only with the mouth, the oesophagus, the stomach, the small intestine and the large intestine, but not with any other organs.

Communication between food and such organs as the liver, kidney, heart, brain etc is indirect. After the food is broken down into its constituent parts, blood delivers these constituents to the organs to enable them to function properly.

One exception to this rule is alcohol. Alcohol is the ultimate non-nutrient that contains calories but no vitamins or minerals. It goes straight into the blood, bypassing the whole digestive process, hitting the liver before you have finished the first glass, and the brain soon afterwards.

Generally, we can now see why some doctors believe that humans are nothing but a complicated tube. Everything we are able to do, our great thought processes, our great achievements, our great sporting conquests, are, in effect, the result of the body having enough carbon to do the job right, and the mind focusing on the achievement.

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