I think the biggest culprit in the downfall is our food. may sound stupid, but we are all eating JUNK and it greatly effects your body - your tired, cranky, out of shape, keep putting junk in it, body is going to run like junk... Start eating healthy food and get your 60 minutes a day of exercise, you will see how much happier you will be. instead, we are inside playing on these damn computers and video games, eating a pizza. . .