“The field of lymphology is still in its infancy in the USA and New York, but this is not true in Europe. Biophysical studies there have shown that belly laughter accomplishes the diaphragmatic breathing necessary (diaphragm fluttering up and down at a very quick rate) to create a strong negative pressure within the thoracic duct (the largest lymphatic vessel in the body) and by so doing, literally propels the lymph out through the body at a rate of 10-15 times its normal speed.
In effect, whenever you laugh from your belly, your diaphragm becomes a powerful pump for your lymphatic circulation, much like your heart serves as the central pump that propels blood through your blood vessels.
This assists the lymphatic vessels in carrying this fluid through your body and helps your lymph nodes to clean and filter this fluid, removing waste products, dead cells, and even unwanted microorganisms. Maintaining clean body fluids is important because these are necessary for you to be at your best.”