Body and mind are not separate entities.  They are both part of the same being.  It’s inconceivable to think that what happens to one has no effect over the other.  Just because we can’t see thoughts, that doen’t mean they don’t have a real physical existence, and that they do not have consequences in our bodies, especially when they are of a repetitive nature.  In the same way, when something happens to our body, it would be unbelievable to think that the pain or unease would not occupy our thoughts.  For this reason, true health implies both, a healthy body has necessarily a healthy mind and viceversa.