B - Be who you are and the people who matters the most will love your for that, not for who you pretend to be;
C - Live each new day as they come, with good, bad and ugly experiences. They, after all, makes you who you are.
Listening to the panel of scientists and professors it comes as no surprise that people who take time to enjoy their family and friends, who exercises a couple of times a weeks, who forgive themselves for mistakes made, who makes time to do something meaningful to others (it does not mean how big or small), who laughs and take time off to just relax and be goofy once a day are much less at risk to be depressed and have higher chances to be a happy and consequently a healthier person.
As you see happiness, now proven by scientists and professors at Havard: is not related to financial achievement or possessions; it does not required complicated formulas or calculations; it's not for sale and it can't be bought regardless of how much money one might have; is not in a distant land nor will only happen when you get there. It's here and now, it's acessible to everyone who cares enough to get it; it comes from inside and then, reflects on everything else.