Its purpose in the digestion of fat, anatomy, physiology: 
The purpose of the lymph system is to ward off any disease from infecting the body. Your body's lymph system uses lymphocytes to absorb unwanted substances that the body considers a threat to its existence. When your body has an infection or a tumor, the lymph system near the site in question kicks into overdrive. That is why a sick person may feel swollen lymph nodes near the site the body is fighting to keep it from spreading.
Most people are aware of the above purpose of the lymphatic system, but many people are not aware that another key function of the lymph system is to aid in the digestion of fat. Since this is the case, it may be that the body considers fat in your food a potential threat. 
The largest lymph vessel in the body is called the thoracic duct. Most fat from the intestines passes through this 2-3 millimeter wide tube, which travels from the digestive system in the abdomen, hugging the left side of your spine all the way up to your neck. Once arriving to your neck, the fat then dumps right into your blood stream and circulates throughout the rest of the body. This is the reason why the thoracic duct of the lymph system is also called the alimentary duct. (41)
Notice that digested fat eventually makes its way to your blood, but only after going through the body’s disease inspecting and disease killing lymphatic system. If your body only offers a small 2-3 millimeter narrow tube to filter the fat you eat, then maybe our bodies weren’t designed to intake excessive fat. Maybe that’s one of the reasons we are counseled to avoid daily intake of excessive fats in our diet.
Why tax our lymphatic system with excessive dietary fat, when we need this same system later on to function as perfect as possible when fighting infections and disease. And even though the thoracic duct allows much of our digested fat to pass into our blood, that same fat may still be hazardous to your health; fat can contribute to causing a slew of illnesses.

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