What Human Can Eat Based On The Intestinal Structure
During long evolution of the human history, we dependen on food for a living. The structure of our body determines what we can eat to keep us healthy. On the other side, the food we usually eat may subtlely change the internal structure of our organs. Therefore, the evolution is a long process of food and body adapting to suit for each other. We can learn some interesting facts from the comparison of human and animal animals body structure to get a better understanding of how modern humans should eat.
The structure characteristics of human gastro-intestinal tract is closer to one in herbivores. From the view of gastric pH, the human stomach acidity is similar to herbivores. Predators have an acidity in the stomach more than 20 times stronger than herbivores. Due to the fact that the meat is not easy to be digested, only a strong stomach acids can meet the needs of digesting meat and bones. Thus, if people eat too much meat, it will cause indigestion and stomach discomfort.
The surface of human stomach has a large number of folds which can increase the digest absorption ability for food. A human being has an intestinal of length of 12 times than his back bones. Also, the stomach surface has rich number of ring wrinkle fold which can greatly increase the surface area for food. This structure enable the food to be processed slowly to the maximum degree for absorption. The slow digestion is suitable for plants and fiber rich of food instead of meat. If people eat too much meat, it is easy to get a blocked bowel and cause the absorption of toxins to be increaseed and had a significant negative impact on health.
On the contrary, the carnivorous animals only have a one third length of small intestine in their body. Also, the intestines of these animals are very smooth and contain very little folded areas inside. So, the intestines of these predators are more suitable for the digestion of meat food. These foods do not contain dietary fibre and will produce a lot of waste products and toxins during the digestion. The evolution leads to the intestine of those animals to be short, straight and smooth which enable the toxins produced by rotting meat from the body to be expelled outside the body as soon as possible.
By Biswarup Ganguly (Own work) [GFDL (http://www.gnu.org/copyleft/fdl.html) or CC BY 3.0 (http://creativecommons.org/licenses/by/3.0)], via Wikimedia Commons
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