Did you know that "smiling" can trick your brain into happiness even when you are sad? And when you're happy, it comes with a lot of benefit to the human body and mind. 

According to  Dr. Murray Grossan, an ENT-otolaryngologist in Los Angeles points to the science of psychoneuroimmunology (the study of how the brain is connected to the immune system), asserting that it has been shown “over and over again” that depression weakens your immune system, while happiness on the other hand has been shown to boost our body’s resistance. 

“What’s crazy is that just the physical act of smiling can make a difference in building your immunity,” says Dr. Grossan. “When you smile, the brain sees the muscle [activity] and assumes that humor is happening.”

“Even forcing a fake smile can legitimately reduce stress and lower your heart rate,” adds Dr. Sivan Finkel, a cosmetic dentist at NYC’s The Dental Parlour. “A study performed by a group at the University of Cardiff in Wales found that people who could not frown due to botox injections were happier on average than those who could frown.”