Do the things that damaged health in ancient Israel still damage health today?
Yes. The same things that damaged health in ancient Israel still damage health today because God has not changed and the world's circumstances have not changed. He admonished Israel not to do certain things for their own good, and He admonishes us likewise.
Les explains that although we are not under law but under grace, the God of the Old Testament and the Mosaic law is the same God we deal with today, and He has not changed. God is the same yesterday, today, and forever. What God hated way back in Genesis, He hates today. The things God admonished Israel not to do for their own good, He admonishes us today not to do for our own good. The circumstances of the world have not changed; the things that damaged an individual's health in Israel's early days are no different than they do today.