Sniff some Lavender or Rosemary - The scent of Lavender can bring you a restful night's sleep - but the plant can do you a world of good in the daylight, too. In a recent study, volunteers sniffed the essential oils of Lavender or rosemary for 5 minutes.

Result: Levels of the stress hormone cortisol in saliva dropped as mcuh as 24%. That's good, because
the hormone increases blodd pressure and suppresses the immune system. What's more, people who smelled low concentrations of Lavender or high concentrations of Rosemary were better at getting rid of free radicals, the pesky molecules believed to speed aging and disease.