Here's what I know. If you are an American, and you are reading this post odds are that you have a terrible diet. If you are from some other country, odds are that you have a better diet. If you are a time traveler coming from a time several hundred years in the past, you probably have a pretty good diet. As your diet is bad, you are likely overweight. I know I'm overweight, I know that I spent most of my life eating the Standard American Diet, and as I began to move past my 20's (when your body can gain nutrition from just about anything) I began to....swell.. I also began to get less sleep, work longer hours, spend less time being active and generally speaking got sick.