Most of our battle is with our brain. The tricky element of our body can make or break us. The successful ones know how to fight with it or at least tame it. We live our life, at least most part of it, with our thoughts.
In order to think right and tame our mind one has to put into rigors region of correct daily habits and vice/virtue calculations.
Food, community, and physical fitness all have an impact on our brains and body. So in short to lead a well meaningful life we have to live well. To live well we have to consume the right things.