Everything that we do in this world is for our bodies!! Anxiety, depressions, illness, excitement, emotions etc, are all translated into our body reactions. Due to these either our nerves become tenses or relax!! based on these we start reacting.
There are two methods prescribed by ALLAH to control our reactions generated due to our body and fasting is one of them.
If we are fasting as a ritual, then it is a useless exercise. Only we understand the reason behind why we have to fasting, only then we can reap the benefit.
Food has nothing to do with it. It's all about our controls on nerves, so that we can succeed in this world and hereafter.