What is the point of caring for the body?

The body is part of the person. That is why caring for it is not superficial, and mistreating it is not authentic freedom. What you do with your body also affects your soul. Christian faith does not despise the bodily dimension. It invites you to live it with dignity: rest, sobriety, purity, cleanliness, health, and respect. God created the whole person, not just an invisible part. It does not help to close this question with a quick phrase. If it arises, it can be a good occasion to form faith better, seek advice, and think with greater calm. The Church does not fear honest questions; what impoverishes is refusing to search in earnest.