Mind (I had to look it up) One definition: 1. the element of a person that enables them to be aware of the world and their experiences, to think, and to feel; the faculty of consciousness and thought. 2. a person's intellect.

Brain 1. an organ of soft nervous tissue contained in the skull of vertebrates, functioning as the coordinating center of sensation and intellectual and nervous activity. 2. intellectual capacity.

IMO both our our mind and our brain effect our body. As far as our mind goes, if we get into unhealthy thinking habits or consume garbage information (pointless violent movies, pornography, fake news--lot's of fake news has bad motives and is about whipping up fear and creating doubts, etc.), in the long run, it is not good for our physical health.