Jesus rebukes the Pharisees for leading people away from obeying God's Word, for the sake of keeping some of their traditions. Interestingly, He then declares all food clean, contra Leviticus 11!
Jesus heals people outside Israel, too, in Tyre and then east in Decapolis again. He was apparently looking for some R&R, not to deliberately heal. But the faith of some He meets prompts Him to heal them.
Sins this may reveal
Sticking to routines instead of deliberate obedience to God's Word.
Focus on nutrition or other lesser defilements more than actual sins we commit.
Not asking Jesus for things we need - thinking we aren't important enough to ask.