Many students of Scripture consider Mark 7:19 to be a slam dunk indicating that God considers all food clean and available for eating. Rabbi Dr. John Fischer provided the most succinct analysis of Mark 7:19 that I’ve ever encountered. This is significant because analyzing the passage can be a very complicated exercise.
His article “Jesus Through Jewish Eyes” is excellent it’s entirety, but the Appendix “Are All Foods Clean? or Down the Drain!” can be found by scrolling to the bottom of the page.
A Strictly Literal Rendering of Mark 7:19
"…because it enters not of him into the heart but into the belly, and into the drain goes out, purging all the food."
Contextual Analysis of Mark 7:19
1. "Food" by definition in Yeshua’s context is only what is kosher!
2. The context of this text deals with hand-washing not eating food or what is kosher.
3. The point of the passage (as emphasized by Mt. 15:20b) is "eating with unwashed hands—not eating non-kosher food—does not make a person unclean."