There may be a lot more for you to learn about the healthful art of laughing and smiling.
It is known that laughing produces rapid rhythmical contractions of the diaphragm. These rhythmical contractions have a healthful effect on the abdominal organs, stimulating their functions and activating the digestive secretions, especially those of the liver. They also modify the rhythm of breathing, stimulate the pulmonary function and the activity of the heart and thereby produce a better oxidization. The popular proverb which says that “laughing makes good blood” is therefore scientifically accurate.