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In this CHIASM, Jesus ate and drank with some unrighteous people.
1) In the FIRST/LAST elements, Jesus called sinners to repentance. That is the same theme of the Old Testament.
2) The INTERMEDIATE SUMMARY (verse 31) is relocated from the end making it especially emphatic. Jesus proclaimed he called the sinners to repentance in verse 32, so verse 31 looks at the sinners as the sick who need Jesus the physician. In other words, this is not about physical healing but spiritual healing, the sinners are the sick who need Jesus the heals the separation of Adam and Eve.