4 ms·

This effect has been observed for thousands of years - an ancient proverb says “A joyful heart doeth good like a medicine: but a broken spirit drieth the bones

• Lxr 10y ago
  The novel part is causality - obviously sick people are less happy but this demonstrates cause and effect.
  • danielvf 10y ago
    That causualty is the whole point of the old proverb. Being happy makes you healthier, being sad makes you sicker.