Because the way you treat your body has a lot to do with how enjoyable that ride is going to be for you. For instance, obesity is correlated with a whole range

Because the way you treat your body has a lot to do with how enjoyable that ride is going to be for you. For instance, obesity is correlated with a whole range of different health problems. But your nutrition is also vital even if you don't gain a lot of weight. Take the extra cheeseburgers for instance, where we know that excess consumption of red meat can cause colon cancer, to name just one example.