Do you not know you are a temple of God and that the Spirit of God dwells in you?
1 Corinthians 3:16
We are a temple of God and we need to be mindful of how we treat ourselves.
Taking care of our bodies and minds, is taking care so that we can better serve God and be open to receiving His blessings. We can take care of our bodies by doing what is health - eating health foods, exercising and in general avoiding things that are harmful. We can take care of our minds by taking care regarding what we read, watch on TV and keeping our thoughts positive and centered on living a godly life.
God says His Spirit dwells in you, and all you have to do is keep the door open for Him.